I am using python 3.7 on windows.
Here is the whole __init__.py code.
I didn't post it completely before due to its length.
The line in question is 2359. I previously sent you the function
containing said line.
[python]
"""
A collection of utility functions and classes. Originally, many
(but not all) were from the Python Cookbook -- hence the name cbook.
This module is safe to import from anywhere within matplotlib;
it imports matplotlib only at runtime.
"""
from __future__ import absolute_import, division, print_function
import six
from six.moves import xrange, zip
import collections
import contextlib
import datetime
import errno
import functools
import glob
import gzip
import io
from itertools import repeat
import locale
import numbers
import operator
import os
import re
import sys
import time
import traceback
import types
import warnings
from weakref import ref, WeakKeyDictionary
import numpy as np
import matplotlib
from .deprecation import deprecated, warn_deprecated
from .deprecation import mplDeprecation, MatplotlibDeprecationWarning
def unicode_safe(s):
if isinstance(s, bytes):
try:
# On some systems, locale.getpreferredencoding returns None,
# which can break unicode; and the sage project reports that
# some systems have incorrect locale specifications, e.g.,
# an encoding instead of a valid locale name. Another
# pathological case that has been reported is an empty string.
# On some systems, getpreferredencoding sets the locale, which has
# side effects. Passing False eliminates those side effects.
preferredencoding = locale.getpreferredencoding(
matplotlib.rcParams['axes.formatter.use_locale']).strip()
if not preferredencoding:
preferredencoding = None
except (ValueError, ImportError, AttributeError):
preferredencoding = None
if preferredencoding is None:
return six.text_type(s)
else:
return six.text_type(s, preferredencoding)
return s
@deprecated('2.1')
class converter(object):
"""
Base class for handling string -> python type with support for
missing values
"""
def __init__(self, missing='Null', missingval=None):
self.missing = missing
self.missingval = missingval
def __call__(self, s):
if s == self.missing:
return self.missingval
return s
def is_missing(self, s):
return not s.strip() or s == self.missing
@deprecated('2.1')
class tostr(converter):
"""convert to string or None"""
def __init__(self, missing='Null', missingval=''):
converter.__init__(self, missing=missing, missingval=missingval)
@deprecated('2.1')
class todatetime(converter):
"""convert to a datetime or None"""
def __init__(self, fmt='%Y-%m-%d', missing='Null', missingval=None):
'use a :func:
time.strptime format string for conversion'
converter.__init__(self, missing, missingval)
self.fmt = fmt
def __call__(self, s):
if self.is_missing(s):
return self.missingval
tup = time.strptime(s, self.fmt)
return datetime.datetime(*tup[:6])
@deprecated('2.1')
class todate(converter):
"""convert to a date or None"""
def __init__(self, fmt='%Y-%m-%d', missing='Null', missingval=None):
"""use a :func:
time.strptime format string for conversion"""
converter.__init__(self, missing, missingval)
self.fmt = fmt
def __call__(self, s):
if self.is_missing(s):
return self.missingval
tup = time.strptime(s, self.fmt)
return datetime.date(*tup[:3])
@deprecated('2.1')
class tofloat(converter):
"""convert to a float or None"""
def __init__(self, missing='Null', missingval=None):
converter.__init__(self, missing)
self.missingval = missingval
def __call__(self, s):
if self.is_missing(s):
return self.missingval
return float(s)
@deprecated('2.1')
class toint(converter):
"""convert to an int or None"""
def __init__(self, missing='Null', missingval=None):
converter.__init__(self, missing)
def __call__(self, s):
if self.is_missing(s):
return self.missingval
return int(s)
class _BoundMethodProxy(object):
"""
Our own proxy object which enables weak references to bound and unbound
methods and arbitrary callables. Pulls information about the function,
class, and instance out of a bound method. Stores a weak reference to the
instance to support garbage collection.
@organization: IBM Corporation
@copyright: Copyright © 2005, 2006 IBM Corporation
@license: The BSD License
Minor bugfixes by Michael Droettboom
"""
def __init__(self, cb):
self._hash = hash(cb)
self._destroy_callbacks = []
try:
try:
if six.PY3:
self.inst = ref(cb.__self__, self._destroy)
else:
self.inst = ref(cb.im_self, self._destroy)
except TypeError:
self.inst = None
if six.PY3:
self.func = cb.__func__
self.klass = cb.__self__.__class__
else:
self.func = cb.im_func
self.klass = cb.im_class
except AttributeError:
self.inst = None
self.func = cb
self.klass = None
def add_destroy_callback(self, callback):
self._destroy_callbacks.append(_BoundMethodProxy(callback))
def _destroy(self, wk):
for callback in self._destroy_callbacks:
try:
callback(self)
except ReferenceError:
pass
def __getstate__(self):
d = self.__dict__.copy()
# de-weak reference inst
inst = d['inst']
if inst is not None:
d['inst'] = inst()
return d
def __setstate__(self, statedict):
self.__dict__ = statedict
inst = statedict['inst']
# turn inst back into a weakref
if inst is not None:
self.inst = ref(inst)
def __call__(self, *args, **kwargs):
"""
Proxy for a call to the weak referenced object. Take
arbitrary params to pass to the callable.
Raises
ReferenceError: When the weak reference refers to
a dead object
"""
if self.inst is not None and self.inst() is None:
raise ReferenceError
elif self.inst is not None:
# build a new instance method with a strong reference to the
# instance
mtd = types.MethodType(self.func, self.inst())
else:
# not a bound method, just return the func
mtd = self.func
# invoke the callable and return the result
return mtd(*args, **kwargs)
def __eq__(self, other):
"""
Compare the held function and instance with that held by
another proxy.
"""
try:
if self.inst is None:
return self.func == other.func and other.inst is None
else:
return self.func == other.func and self.inst() == other.inst()
except Exception:
return False
def __ne__(self, other):
"""
Inverse of __eq__.
"""
return not self.__eq__(other)
def __hash__(self):
return self._hash
def _exception_printer(exc):
traceback.print_exc()
class CallbackRegistry(object):
"""Handle registering and disconnecting for a set of signals and callbacks:
>>> def oneat(x):
... print('eat', x)
>>> def ondrink(x):
... print('drink', x)
>>> from matplotlib.cbook import CallbackRegistry
>>> callbacks = CallbackRegistry()
>>> id_eat = callbacks.connect('eat', oneat)
>>> id_drink = callbacks.connect('drink', ondrink)
>>> callbacks.process('drink', 123)
drink 123
>>> callbacks.process('eat', 456)
eat 456
>>> callbacks.process('be merry', 456) # nothing will be called
>>> callbacks.disconnect(id_eat)
>>> callbacks.process('eat', 456) # nothing will be called
In practice, one should always disconnect all callbacks when they
are no longer needed to avoid dangling references (and thus memory
leaks). However, real code in matplotlib rarely does so, and due
to its design, it is rather difficult to place this kind of code.
To get around this, and prevent this class of memory leaks, we
instead store weak references to bound methods only, so when the
destination object needs to die, the CallbackRegistry won't keep
it alive. The Python stdlib weakref module can not create weak
references to bound methods directly, so we need to create a proxy
object to handle weak references to bound methods (or regular free
functions). This technique was shared by Peter Parente on his
`"Mindtrove" blog
<http://mindtrove.info/python-weak-references/>`_.
Parameters
----------
exception_handler : callable, optional
If provided must have signature ::
def handler(exc: Exception) -> None:
If not None this function will be called with any
Exception
subclass raised by the callbacks in
CallbackRegistry.process.
The handler may either consume the exception or re-raise.
The callable must be pickle-able.
The default handler is ::
def h(exc):
traceback.print_exc()
"""
def __init__(self, exception_handler=_exception_printer):
self.exception_handler = exception_handler
self.callbacks = dict()
self._cid = 0
self._func_cid_map = {}
# In general, callbacks may not be pickled; thus, we simply recreate an
# empty dictionary at unpickling. In order to ensure that
__setstate__
# (which just defers to
__init__) is called,
__getstate__ must
# return a truthy value (for pickle protocol>=3, i.e. Py3, the
# *actual* behavior is that
__setstate__ will be called as long as
#
__getstate__ does not return
None, but this is undocumented -- see
#
http://bugs.python.org/issue12290).
def __getstate__(self):
return {'exception_handler': self.exception_handler}
def __setstate__(self, state):
self.__init__(**state)
def connect(self, s, func):
"""Register *func* to be called when signal *s* is generated.
"""
self._func_cid_map.setdefault(s, WeakKeyDictionary())
# Note proxy not needed in python 3.
# TODO rewrite this when support for python2.x gets dropped.
proxy = _BoundMethodProxy(func)
if proxy in self._func_cid_map[s]:
return self._func_cid_map[s][proxy]
proxy.add_destroy_callback(self._remove_proxy)
self._cid += 1
cid = self._cid
self._func_cid_map[s][proxy] = cid
self.callbacks.setdefault(s, dict())
self.callbacks[s][cid] = proxy
return cid
def _remove_proxy(self, proxy):
for signal, proxies in list(six.iteritems(self._func_cid_map)):
try:
del self.callbacks[signal][proxies[proxy]]
except KeyError:
pass
if len(self.callbacks[signal]) == 0:
del self.callbacks[signal]
del self._func_cid_map[signal]
def disconnect(self, cid):
"""Disconnect the callback registered with callback id *cid*.
"""
for eventname, callbackd in list(six.iteritems(self.callbacks)):
try:
del callbackd[cid]
except KeyError:
continue
else:
for signal, functions in list(
six.iteritems(self._func_cid_map)):
for function, value in list(six.iteritems(functions)):
if value == cid:
del functions[function]
return
def process(self, s, *args, **kwargs):
"""
Process signal *s*.
All of the functions registered to receive callbacks on *s* will be
called with
*args
and
**kwargs
.
"""
if s in self.callbacks:
for cid, proxy in list(six.iteritems(self.callbacks[s])):
try:
proxy(*args, **kwargs)
except ReferenceError:
self._remove_proxy(proxy)
# this does not capture KeyboardInterrupt, SystemExit,
# and GeneratorExit
except Exception as exc:
if self.exception_handler is not None:
self.exception_handler(exc)
else:
raise
class silent_list(list):
"""
override repr when returning a list of matplotlib artists to
prevent long, meaningless output. This is meant to be used for a
homogeneous list of a given type
"""
def __init__(self, type, seq=None):
self.type = type
if seq is not None:
self.extend(seq)
def __repr__(self):
return '<a list of %d %s objects>' % (len(self), self.type)
def __str__(self):
return repr(self)
def __getstate__(self):
# store a dictionary of this SilentList's state
return {'type': self.type, 'seq': self[:]}
def __setstate__(self, state):
self.type = state['type']
self.extend(state['seq'])
class IgnoredKeywordWarning(UserWarning):
"""
A class for issuing warnings about keyword arguments that will be ignored
by matplotlib
"""
pass
def local_over_kwdict(local_var, kwargs, *keys):
"""
Enforces the priority of a local variable over potentially conflicting
argument(s) from a kwargs dict. The following possible output values are
considered in order of priority:
local_var > kwargs[keys[0]] > ... > kwargs[keys[-1]]
The first of these whose value is not None will be returned. If all are
None then None will be returned. Each key in keys will be removed from the
kwargs dict in place.
Parameters
----------
local_var: any object
The local variable (highest priority)
kwargs: dict
Dictionary of keyword arguments; modified in place
keys: str(s)
Name(s) of keyword arguments to process, in descending order of
priority
Returns
-------
out: any object
Either local_var or one of kwargs[key] for key in keys
Raises
------
IgnoredKeywordWarning
For each key in keys that is removed from kwargs but not used as
the output value
"""
out = local_var
for key in keys:
kwarg_val = kwargs.pop(key, None)
if kwarg_val is not None:
if out is None:
out = kwarg_val
else:
warnings.warn('"%s" keyword argument will be ignored' % key,
IgnoredKeywordWarning)
return out
def strip_math(s):
"""remove latex formatting from mathtext"""
remove = (r'\mathdefault', r'\rm', r'\cal', r'\tt', r'\it', '\\', '{', '}')
s = s[1:-1]
for r in remove:
s = s.replace(r, '')
return s
class Bunch(object):
"""
Often we want to just collect a bunch of stuff together, naming each
item of the bunch; a dictionary's OK for that, but a small do- nothing
class is even handier, and prettier to use. Whenever you want to
group a few variables::
>>> point = Bunch(datum=2, squared=4, coord=12)
>>> point.datum
By: Alex Martelli
From:
https://code.activestate.com/recipes/121294/
"""
def __init__(self, **kwds):
self.__dict__.update(kwds)
def __repr__(self):
return 'Bunch(%s)' % ', '.join(
'%s=%s' % kv for kv in six.iteritems(vars(self)))
@deprecated('2.1')
def unique(x):
"""Return a list of unique elements of *x*"""
return list(set(x))
def iterable(obj):
"""return true if *obj* is iterable"""
try:
iter(obj)
except TypeError:
return False
return True
@deprecated('2.1')
def is_string_like(obj):
"""Return True if *obj* looks like a string"""
# (np.str_ == np.unicode_ on Py3).
return isinstance(obj, (six.string_types, np.str_, np.unicode_))
@deprecated('2.1')
def is_sequence_of_strings(obj):
"""Returns true if *obj* is iterable and contains strings"""
if not iterable(obj):
return False
if is_string_like(obj) and not isinstance(obj, np.ndarray):
try:
obj = obj.values
except AttributeError:
# not pandas
return False
for o in obj:
if not is_string_like(o):
return False
return True
def is_hashable(obj):
"""Returns true if *obj* can be hashed"""
try:
hash(obj)
except TypeError:
return False
return True
def is_writable_file_like(obj):
"""return true if *obj* looks like a file object with a *write* method"""
return callable(getattr(obj, 'write', None))
def file_requires_unicode(x):
"""
Returns
True if the given writable file-like object requires Unicode
to be written to it.
"""
try:
x.write(b'')
except TypeError:
return True
else:
return False
@deprecated('2.1')
def is_scalar(obj):
"""return true if *obj* is not string like and is not iterable"""
return not isinstance(obj, six.string_types) and not iterable(obj)
def is_numlike(obj):
"""return true if *obj* looks like a number"""
return isinstance(obj, (numbers.Number, np.number))
def to_filehandle(fname, flag='rU', return_opened=False, encoding=None):
"""
*fname* can be an
os.PathLike or a file handle. Support for gzipped
files is automatic, if the filename ends in .gz. *flag* is a
read/write flag for :func:
file
"""
if hasattr(os, "PathLike") and isinstance(fname, os.PathLike):
return to_filehandle(
os.fspath(fname),
flag=flag, return_opened=return_opened, encoding=encoding)
if isinstance(fname, six.string_types):
if fname.endswith('.gz'):
# get rid of 'U' in flag for gzipped files.
flag = flag.replace('U', '')
fh = gzip.open(fname, flag)
elif fname.endswith('.bz2'):
# python may not be complied with bz2 support,
# bury import until we need it
import bz2
# get rid of 'U' in flag for bz2 files
flag = flag.replace('U', '')
fh = bz2.BZ2File(fname, flag)
else:
fh = io.open(fname, flag, encoding=encoding)
opened = True
elif hasattr(fname, 'seek'):
fh = fname
opened = False
else:
raise ValueError('fname must be a PathLike or file handle')
if return_opened:
return fh, opened
return fh
@contextlib.contextmanager
def open_file_cm(path_or_file, mode="r", encoding=None):
r"""Pass through file objects and context-manage
.PathLike\s."""
fh, opened = to_filehandle(path_or_file, mode, True, encoding)
if opened:
with fh:
yield fh
else:
yield fh
def is_scalar_or_string(val):
"""Return whether the given object is a scalar or string like."""
return isinstance(val, six.string_types) or not iterable(val)
def _string_to_bool(s):
"""Parses the string argument as a boolean"""
if not isinstance(s, six.string_types):
return bool(s)
warn_deprecated("2.2", "Passing one of 'on', 'true', 'off', 'false' as a "
"boolean is deprecated; use an actual boolean "
"(True/False) instead.")
if s.lower() in ['on', 'true']:
return True
if s.lower() in ['off', 'false']:
return False
raise ValueError('String "%s" must be one of: '
'"on", "off", "true", or "false"' % s)
def get_sample_data(fname, asfileobj=True):
"""
Return a sample data file. *fname* is a path relative to the
mpl-data/sample_data directory. If *asfileobj* is
True
return a file object, otherwise just a file path.
Set the rc parameter examples.directory to the directory where we should
look, if sample_data files are stored in a location different than
default (which is 'mpl-data/sample_data
at the same level of 'matplotlib
Python module files).
If the filename ends in .gz, the file is implicitly ungzipped.
"""
if matplotlib.rcParams['examples.directory']:
root = matplotlib.rcParams['examples.directory']
else:
root = os.path.join(matplotlib._get_data_path(), 'sample_data')
path = os.path.join(root, fname)
if asfileobj:
if (os.path.splitext(fname)[-1].lower() in
('.csv', '.xrc', '.txt')):
mode = 'r'
else:
mode = 'rb'
base, ext = os.path.splitext(fname)
if ext == '.gz':
return gzip.open(path, mode)
else:
return open(path, mode)
else:
return path
def flatten(seq, scalarp=is_scalar_or_string):
"""
Returns a generator of flattened nested containers
For example:
>>> from matplotlib.cbook import flatten
>>> l = (('John', ['Hunter']), (1, 23), [[([42, (5, 23)], )]])
>>> print(list(flatten(l)))
['John', 'Hunter', 1, 23, 42, 5, 23]
By: Composite of Holger Krekel and Luther Blissett
From:
https://code.activestate.com/recipes/121294/
and Recipe 1.12 in cookbook
"""
for item in seq:
if scalarp(item) or item is None:
yield item
else:
for subitem in flatten(item, scalarp):
yield subitem
@deprecated('2.1', "sorted(..., key=itemgetter(...))")
class Sorter(object):
"""
Sort by attribute or item
Example usage::
sort = Sorter()
list = [(1, 2), (4, 8), (0, 3)]
dict = [{'a': 3, 'b': 4}, {'a': 5, 'b': 2}, {'a': 0, 'b': 0},
{'a': 9, 'b': 9}]
sort(list) # default sort
sort(list, 1) # sort by index 1
sort(dict, 'a') # sort a list of dicts by key 'a'
"""
def _helper(self, data, aux, inplace):
aux.sort()
result = [data[i] for junk, i in aux]
if inplace:
data[:] = result
return result
def byItem(self, data, itemindex=None, inplace=1):
if itemindex is None:
if inplace:
data.sort()
result = data
else:
result = sorted(data)
return result
else:
aux = [(data[i][itemindex], i) for i in range(len(data))]
return self._helper(data, aux, inplace)
def byAttribute(self, data, attributename, inplace=1):
aux = [(getattr(data[i], attributename), i) for i in range(len(data))]
return self._helper(data, aux, inplace)
# a couple of handy synonyms
sort = byItem
__call__ = byItem
@deprecated('2.1')
class Xlator(dict):
"""
All-in-one multiple-string-substitution class
Example usage::
text = "Larry Wall is the creator of Perl"
adict = {
"Larry Wall" : "Guido van Rossum",
"creator" : "Benevolent Dictator for Life",
"Perl" : "Python",
}
print(multiple_replace(adict, text))
xlat = Xlator(adict)
print(xlat.xlat(text))
"""
def _make_regex(self):
""" Build re object based on the keys of the current dictionary """
return re.compile("|".join(map(re.escape, self)))
def __call__(self, match):
""" Handler invoked for each regex *match* """
return self[match.group(0)]
def xlat(self, text):
""" Translate *text*, returns the modified text. """
return self._make_regex().sub(self, text)
@deprecated('2.1')
def soundex(name, len=4):
""" soundex module conforming to Odell-Russell algorithm """
# digits holds the soundex values for the alphabet
soundex_digits = '01230120022455012623010202'
sndx = ''
fc = ''
# Translate letters in name to soundex digits
for c in name.upper():
if c.isalpha():
if not fc:
fc = c # Remember first letter
d = soundex_digits[ord© - ord('A')]
# Duplicate consecutive soundex digits are skipped
if not sndx or (d != sndx[-1]):
sndx += d
# Replace first digit with first letter
sndx = fc + sndx[1:]
# Remove all 0s from the soundex code
sndx = sndx.replace('0', '')
# Return soundex code truncated or 0-padded to len characters
return (sndx + (len * '0'))[:len]
@deprecated('2.1')
class Null(object):
""" Null objects always and reliably "do nothing." """
def __init__(self, *args, **kwargs):
pass
def __call__(self, *args, **kwargs):
return self
def __str__(self):
return "Null()"
def __repr__(self):
return "Null()"
if six.PY3:
def __bool__(self):
return 0
else:
def __nonzero__(self):
return 0
def __getattr__(self, name):
return self
def __setattr__(self, name, value):
return self
def __delattr__(self, name):
return self
def mkdirs(newdir, mode=0o777):
"""
make directory *newdir* recursively, and set *mode*. Equivalent to ::
> mkdir -p NEWDIR
> chmod MODE NEWDIR
"""
# this functionality is now in core python as of 3.2
# LPY DROP
if six.PY3:
os.makedirs(newdir, mode=mode, exist_ok=True)
else:
try:
os.makedirs(newdir, mode=mode)
except OSError as exception:
if exception.errno != errno.EEXIST:
raise
class GetRealpathAndStat(object):
def __init__(self):
self._cache = {}
def __call__(self, path):
result = self._cache.get(path)
if result is None:
realpath = os.path.realpath(path)
if sys.platform == 'win32':
stat_key = realpath
else:
stat = os.stat(realpath)
stat_key = (stat.st_ino, stat.st_dev)
result = realpath, stat_key
self._cache[path] = result
return result
get_realpath_and_stat = GetRealpathAndStat()
@deprecated('2.1')
def dict_delall(d, keys):
"""delete all of the *keys* from the :class:
dict *d*"""
for key in keys:
try:
del d[key]
except KeyError:
pass
@deprecated('2.1')
class RingBuffer(object):
""" class that implements a not-yet-full buffer """
def __init__(self, size_max):
self.max = size_max
self.data = []
class __Full:
""" class that implements a full buffer """
def append(self, x):
""" Append an element overwriting the oldest one. """
self.data[self.cur] = x
self.cur = (self.cur + 1) % self.max
def get(self):
""" return list of elements in correct order """
return self.data[self.cur:] + self.data[:self.cur]
def append(self, x):
"""append an element at the end of the buffer"""
self.data.append(x)
if len(self.data) == self.max:
self.cur = 0
# Permanently change self's class from non-full to full
self.__class__ = __Full
def get(self):
""" Return a list of elements from the oldest to the newest. """
return self.data
def __get_item__(self, i):
return self.data[i % len(self.data)]
@deprecated('2.1')
def get_split_ind(seq, N):
"""
*seq* is a list of words. Return the index into seq such that::
len(' '.join(seq[:ind])<=N
.
"""
s_len = 0
# todo: use Alex's xrange pattern from the cbook for efficiency
for (word, ind) in zip(seq, xrange(len(seq))):
s_len += len(word) + 1 # +1 to account for the len(' ')
if s_len >= N:
return ind
return len(seq)
@deprecated('2.1', alternative='textwrap.TextWrapper')
def wrap(prefix, text, cols):
"""wrap *text* with *prefix* at length *cols*"""
pad = ' ' * len(prefix.expandtabs())
available = cols - len(pad)
seq = text.split(' ')
Nseq = len(seq)
ind = 0
lines = []
while ind < Nseq:
lastInd = ind
ind += get_split_ind(seq[ind:], available)
lines.append(seq[lastInd:ind])
# add the prefix to the first line, pad with spaces otherwise
ret = prefix + ' '.join(lines[0]) + '\n'
for line in lines[1:]:
ret += pad + ' '.join(line) + '\n'
return ret
# A regular expression used to determine the amount of space to
# remove. It looks for the first sequence of spaces immediately
# following the first newline, or at the beginning of the string.
_find_dedent_regex = re.compile(r"(?:(?:\n\r?)|^)( *)\S")
# A cache to hold the regexs that actually remove the indent.
_dedent_regex = {}
def dedent(s):
"""
Remove excess indentation from docstring *s*.
Discards any leading blank lines, then removes up to n whitespace
characters from each line, where n is the number of leading
whitespace characters in the first line. It differs from
textwrap.dedent in its deletion of leading blank lines and its use
of the first non-blank line to determine the indentation.
It is also faster in most cases.
"""
# This implementation has a somewhat obtuse use of regular
# expressions. However, this function accounted for almost 30% of
# matplotlib startup time, so it is worthy of optimization at all
# costs.
if not s: # includes case of s is None
return ''
match = _find_dedent_regex.match(s)
if match is None:
return s
# This is the number of spaces to remove from the left-hand side.
nshift = match.end(1) - match.start(1)
if nshift == 0:
return s
# Get a regex that will remove *up to* nshift spaces from the
# beginning of each line. If it isn't in the cache, generate it.
unindent = _dedent_regex.get(nshift, None)
if unindent is None:
unindent = re.compile("\n\r? {0,%d}" % nshift)
_dedent_regex[nshift] = unindent
result = unindent.sub("\n", s).strip()
return result
def listFiles(root, patterns='*', recurse=1, return_folders=0):
"""
Recursively list files
from Parmar and Martelli in the Python Cookbook
"""
import os.path
import fnmatch
# Expand patterns from semicolon-separated string to list
pattern_list = patterns.split(';')
results = []
for dirname, dirs, files in os.walk(root):
# Append to results all relevant files (and perhaps folders)
for name in files:
fullname = os.path.normpath(os.path.join(dirname, name))
if return_folders or os.path.isfile(fullname):
for pattern in pattern_list:
if fnmatch.fnmatch(name, pattern):
results.append(fullname)
break
# Block recursion if recursion was disallowed
if not recurse:
break
return results
@deprecated('2.1')
def get_recursive_filelist(args):
"""
Recurse all the files and dirs in *args* ignoring symbolic links
and return the files as a list of strings
"""
files = []
for arg in args:
if os.path.isfile(arg):
files.append(arg)
continue
if os.path.isdir(arg):
newfiles = listFiles(arg, recurse=1, return_folders=1)
files.extend(newfiles)
return [f for f in files if not os.path.islink(f)]
@deprecated('2.1')
def pieces(seq, num=2):
"""Break up the *seq* into *num* tuples"""
start = 0
while 1:
item = seq[start:start + num]
if not len(item):
break
yield item
start += num
@deprecated('2.1')
def exception_to_str(s=None):
if six.PY3:
sh = io.StringIO()
else:
sh = io.BytesIO()
if s is not None:
print(s, file=sh)
traceback.print_exc(file=sh)
return sh.getvalue()
@deprecated('2.1')
def allequal(seq):
"""
Return *True* if all elements of *seq* compare equal. If *seq* is
0 or 1 length, return *True*
"""
if len(seq) < 2:
return True
val = seq[0]
for i in xrange(1, len(seq)):
thisval = seq[i]
if thisval != val:
return False
return True
@deprecated('2.1')
def alltrue(seq):
"""
Return *True* if all elements of *seq* evaluate to *True*. If
*seq* is empty, return *False*.
"""
if not len(seq):
return False
for val in seq:
if not val:
return False
return True
@deprecated('2.1')
def onetrue(seq):
"""
Return *True* if one element of *seq* is *True*. It *seq* is
empty, return *False*.
"""
if not len(seq):
return False
for val in seq:
if val:
return True
return False
@deprecated('2.1')
def allpairs(x):
"""
return all possible pairs in sequence *x*
"""
return [(s, f) for i, f in enumerate(x) for s in x[i + 1:]]
class maxdict(dict):
"""
A dictionary with a maximum size; this doesn't override all the
relevant methods to constrain the size, just setitem, so use with
caution
"""
def __init__(self, maxsize):
dict.__init__(self)
self.maxsize = maxsize
self._killkeys = []
def __setitem__(self, k, v):
if k not in self:
if len(self) >= self.maxsize:
del self[self._killkeys[0]]
del self._killkeys[0]
self._killkeys.append(k)
dict.__setitem__(self, k, v)
class Stack(object):
"""
Implement a stack where elements can be pushed on and you can move
back and forth. But no pop. Should mimic home / back / forward
in a browser
"""
def __init__(self, default=None):
self.clear()
self._default = default
def __call__(self):
"""return the current element, or None"""
if not len(self._elements):
return self._default
else:
return self._elements[self._pos]
def __len__(self):
return self._elements.__len__()
def __getitem__(self, ind):
return self._elements.__getitem__(ind)
def forward(self):
"""move the position forward and return the current element"""
n = len(self._elements)
if self._pos < n - 1:
self._pos += 1
return self()
def back(self):
"""move the position back and return the current element"""
if self._pos > 0:
self._pos -= 1
return self()
def push(self, o):
"""
push object onto stack at current position - all elements
occurring later than the current position are discarded
"""
self._elements = self._elements[:self._pos + 1]
self._elements.append(o)
self._pos = len(self._elements) - 1
return self()
def home(self):
"""push the first element onto the top of the stack"""
if not len(self._elements):
return
self.push(self._elements[0])
return self()
def empty(self):
return len(self._elements) == 0
def clear(self):
"""empty the stack"""
self._pos = -1
self._elements = []
def bubble(self, o):
"""
raise *o* to the top of the stack and return *o*. *o* must be
in the stack
"""
if o not in self._elements:
raise ValueError('Unknown element o')
old = self._elements[:]
self.clear()
bubbles = []
for thiso in old:
if thiso == o:
bubbles.append(thiso)
else:
self.push(thiso)
for thiso in bubbles:
self.push(o)
return o
def remove(self, o):
'remove element *o* from the stack'
if o not in self._elements:
raise ValueError('Unknown element o')
old = self._elements[:]
self.clear()
for thiso in old:
if thiso == o:
continue
else:
self.push(thiso)
@deprecated('2.1')
def finddir(o, match, case=False):
"""
return all attributes of *o* which match string in match. if case
is True require an exact case match.
"""
if case:
names = [(name, name) for name in dir(o)
if isinstance(name, six.string_types)]
else:
names = [(name.lower(), name) for name in dir(o)
if isinstance(name, six.string_types)]
match = match.lower()
return [orig for name, orig in names if name.find(match) >= 0]
@deprecated('2.1')
def reverse_dict(d):
"""reverse the dictionary -- may lose data if values are not unique!"""
return {v: k for k, v in six.iteritems(d)}
@deprecated('2.1')
def restrict_dict(d, keys):
"""
Return a dictionary that contains those keys that appear in both
d and keys, with values from d.
"""
return {k: v for k, v in six.iteritems(d) if k in keys}
def report_memory(i=0): # argument may go away
"""return the memory consumed by process"""
from matplotlib.compat.subprocess import Popen, PIPE
pid = os.getpid()
if sys.platform == 'sunos5':
try:
a2 = Popen(['ps', '-p', '%d' % pid, '-o', 'osz'],
stdout=PIPE).stdout.readlines()
except OSError:
raise NotImplementedError(
"report_memory works on Sun OS only if "
"the 'ps' program is found")
mem = int(a2[-1].strip())
elif sys.platform.startswith('linux'):
try:
a2 = Popen(['ps', '-p', '%d' % pid, '-o', 'rss,sz'],
stdout=PIPE).stdout.readlines()
except OSError:
raise NotImplementedError(
"report_memory works on Linux only if "
"the 'ps' program is found")
mem = int(a2[1].split()[1])
elif sys.platform.startswith('darwin'):
try:
a2 = Popen(['ps', '-p', '%d' % pid, '-o', 'rss,vsz'],
stdout=PIPE).stdout.readlines()
except OSError:
raise NotImplementedError(
"report_memory works on Mac OS only if "
"the 'ps' program is found")
mem = int(a2[1].split()[0])
elif sys.platform.startswith('win'):
try:
a2 = Popen([str("tasklist"), "/nh", "/fi", "pid eq %d" % pid],
stdout=PIPE).stdout.read()
except OSError:
raise NotImplementedError(
"report_memory works on Windows only if "
"the 'tasklist' program is found")
mem = int(a2.strip().split()[-2].replace(',', ''))
else:
raise NotImplementedError(
"We don't have a memory monitor for %s" % sys.platform)
return mem
_safezip_msg = 'In safezip, len(args[0])=%d but len(args[%d])=%d'
def safezip(*args):
"""make sure *args* are equal len before zipping"""
Nx = len(args[0])
for i, arg in enumerate(args[1:]):
if len(arg) != Nx:
raise ValueError(_safezip_msg % (Nx, i + 1, len(arg)))
return list(zip(*args))
@deprecated('2.1')
def issubclass_safe(x, klass):
"""return issubclass(x, klass) and return False on a TypeError"""
try:
return issubclass(x, klass)
except TypeError:
return False
def safe_masked_invalid(x, copy=False):
x = np.array(x, subok=True, copy=copy)
if not x.dtype.isnative:
# Note that the argument to
byteswap is 'inplace',
# thus if we have already made a copy, do the byteswap in
# place, else make a copy with the byte order swapped.
# Be explicit that we are swapping the byte order of the dtype
x = x.byteswap(copy).newbyteorder('S')
try:
xm = np.ma.masked_invalid(x, copy=False)
xm.shrink_mask()
except TypeError:
return x
return xm
def print_cycles(objects, outstream=sys.stdout, show_progress=False):
"""
*objects*
A list of objects to find cycles in. It is often useful to
pass in gc.garbage to find the cycles that are preventing some
objects from being garbage collected.
*outstream*
The stream for output.
*show_progress*
If True, print the number of objects reached as they are found.
"""
import gc
from types import FrameType
def print_path(path):
for i, step in enumerate(path):
# next "wraps around"
next = path[(i + 1) % len(path)]
outstream.write(" %s -- " % str(type(step)))
if isinstance(step, dict):
for key, val in six.iteritems(step):
if val is next:
outstream.write("[%s]" % repr(key))
break
if key is next:
outstream.write("[key] = %s" % repr(val))
break
elif isinstance(step, list):
outstream.write("[%d]" % step.index(next))
elif isinstance(step, tuple):
outstream.write("( tuple )")
else:
outstream.write(repr(step))
outstream.write(" ->\n")
outstream.write("\n")
def recurse(obj, start, all, current_path):
if show_progress:
outstream.write("%d\r" % len(all))
all[id(obj)] = None
referents = gc.get_referents(obj)
for referent in referents:
# If we've found our way back to the start, this is
# a cycle, so print it out
if referent is start:
print_path(current_path)
# Don't go back through the original list of objects, or
# through temporary references to the object, since those
# are just an artifact of the cycle detector itself.
elif referent is objects or isinstance(referent, FrameType):
continue
# We haven't seen this object before, so recurse
elif id(referent) not in all:
recurse(referent, start, all, current_path + [obj])
for obj in objects:
outstream.write("Examining: %r\n" % (obj,))
recurse(obj, obj, {}, [])
class Grouper(object):
"""
This class provides a lightweight way to group arbitrary objects
together into disjoint sets when a full-blown graph data structure
would be overkill.
Objects can be joined using :meth:
join, tested for connectedness
using :meth:
joined, and all disjoint sets can be retrieved by
using the object as an iterator.
The objects being joined must be hashable and weak-referenceable.
For example:
>>> from matplotlib.cbook import Grouper
>>> class Foo(object):
... def __init__(self, s):
... self.s = s
... def __repr__(self):
... return self.s
...
>>> a, b, c, d, e, f = [Foo(x) for x in 'abcdef']
>>> grp = Grouper()
>>> grp.join(a, b)
>>> grp.join(b, c)
>>> grp.join(d, e)
>>> sorted(map(tuple, grp))
[(a, b, c), (d, e)]
>>> grp.joined(a, b)
True
>>> grp.joined(a, c)
True
>>> grp.joined(a, d)
False
"""
def __init__(self, init=()):
mapping = self._mapping = {}
for x in init:
mapping[ref(x)] = [ref(x)]
def __contains__(self, item):
return ref(item) in self._mapping
def clean(self):
"""
Clean dead weak references from the dictionary
"""
mapping = self._mapping
to_drop = [key for key in mapping if key() is None]
for key in to_drop:
val = mapping.pop(key)
val.remove(key)
def join(self, a, *args):
"""
Join given arguments into the same set. Accepts one or more
arguments.
"""
mapping = self._mapping
set_a = mapping.setdefault(ref(a), [ref(a)])
for arg in args:
set_b = mapping.get(ref(arg))
if set_b is None:
set_a.append(ref(arg))
mapping[ref(arg)] = set_a
elif set_b is not set_a:
if len(set_b) > len(set_a):
set_a, set_b = set_b, set_a
set_a.extend(set_b)
for elem in set_b:
mapping[elem] = set_a
self.clean()
def joined(self, a, b):
"""
Returns True if *a* and *b* are members of the same set.
"""
self.clean()
mapping = self._mapping
try:
return mapping[ref(a)] is mapping[ref(b)]
except KeyError:
return False
def remove(self, a):
self.clean()
mapping = self._mapping
seta = mapping.pop(ref(a), None)
if seta is not None:
seta.remove(ref(a))
def __iter__(self):
"""
Iterate over each of the disjoint sets as a list.
The iterator is invalid if interleaved with calls to join().
"""
self.clean()
token = object()
# Mark each group as we come across if by appending a token,
# and don't yield it twice
for group in six.itervalues(self._mapping):
if group[-1] is not token:
yield [x() for x in group]
group.append(token)
# Cleanup the tokens
for group in six.itervalues(self._mapping):
if group[-1] is token:
del group[-1]
def get_siblings(self, a):
"""
Returns all of the items joined with *a*, including itself.
"""
self.clean()
siblings = self._mapping.get(ref(a), [ref(a)])
return [x() for x in siblings]
def simple_linear_interpolation(a, steps):
"""
Resample an array with
steps - 1
points between original point pairs.
Parameters
----------
a : array, shape (n, ...)
steps : int
Returns
-------
array, shape
((n - 1) * steps + 1, ...)
Along each column of *a*,
(steps - 1)
points are introduced between
each original values; the values are linearly interpolated.
"""
fps = a.reshape((len(a), -1))
xp = np.arange(len(a)) * steps
x = np.arange((len(a) - 1) * steps + 1)
return (np.column_stack([np.interp(x, xp, fp) for fp in fps.T])
.reshape((len(x),) + a.shape[1:]))
@deprecated('2.1', alternative='shutil.rmtree')
def recursive_remove(path):
if os.path.isdir(path):
for fname in (glob.glob(os.path.join(path, '*')) +
glob.glob(os.path.join(path, '.*'))):
if os.path.isdir(fname):
recursive_remove(fname)
os.removedirs(fname)
else:
os.remove(fname)
# os.removedirs(path)
else:
os.remove(path)
def delete_masked_points(*args):
"""
Find all masked and/or non-finite points in a set of arguments,
and return the arguments with only the unmasked points remaining.
Arguments can be in any of 5 categories:
1) 1-D masked arrays
2) 1-D ndarrays
3) ndarrays with more than one dimension
4) other non-string iterables
5) anything else
The first argument must be in one of the first four categories;
any argument with a length differing from that of the first
argument (and hence anything in category 5) then will be
passed through unchanged.
Masks are obtained from all arguments of the correct length
in categories 1, 2, and 4; a point is bad if masked in a masked
array or if it is a nan or inf. No attempt is made to
extract a mask from categories 2, 3, and 4 if :meth:
np.isfinite
does not yield a Boolean array.
All input arguments that are not passed unchanged are returned
as ndarrays after removing the points or rows corresponding to
masks in any of the arguments.
A vastly simpler version of this function was originally
written as a helper for Axes.scatter().
"""
if not len(args):
return ()
if (isinstance(args[0], six.string_types) or not iterable(args[0])):
raise ValueError("First argument must be a sequence")
nrecs = len(args[0])
margs = []
seqlist = [False] * len(args)
for i, x in enumerate(args):
if (not isinstance(x, six.string_types) and iterable(x)
and len(x) == nrecs):
seqlist[i] = True
if isinstance(x, np.ma.MaskedArray):
if x.ndim > 1:
raise ValueError("Masked arrays must be 1-D")
else:
x = np.asarray(x)
margs.append(x)
masks = [] # list of masks that are True where good
for i, x in enumerate(margs):
if seqlist[i]:
if x.ndim > 1:
continue # Don't try to get nan locations unless 1-D.
if isinstance(x, np.ma.MaskedArray):
masks.append(~np.ma.getmaskarray(x)) # invert the mask
xd = x.data
else:
xd = x
try:
mask = np.isfinite(xd)
if isinstance(mask, np.ndarray):
masks.append(mask)
except: # Fixme: put in tuple of possible exceptions?
pass
if len(masks):
mask = np.logical_and.reduce(masks)
igood = mask.nonzero()[0]
if len(igood) < nrecs:
for i, x in enumerate(margs):
if seqlist[i]:
margs[i] = x.take(igood, axis=0)
for i, x in enumerate(margs):
if seqlist[i] and isinstance(x, np.ma.MaskedArray):
margs[i] = x.filled()
return margs
def boxplot_stats(X, whis=1.5, bootstrap=None, labels=None,
autorange=False):
"""
Returns list of dictionaries of statistics used to draw a series
of box and whisker plots. The
Returns section enumerates the
required keys of the dictionary. Users can skip this function and
pass a user-defined set of dictionaries to the new
axes.bxp method
instead of relying on MPL to do the calculations.
Parameters
----------
X : array-like
Data that will be represented in the boxplots. Should have 2 or
fewer dimensions.
whis : float, string, or sequence (default = 1.5)
As a float, determines the reach of the whiskers to the beyond the
first and third quartiles. In other words, where IQR is the
interquartile range (
Q3-Q1), the upper whisker will extend to last
datum less than
Q3 + whis*IQR). Similarly, the lower whisker will
extend to the first datum greater than
Q1 - whis*IQR.
Beyond the whiskers, data are considered outliers
and are plotted as individual points. This can be set this to an
ascending sequence of percentile (e.g., [5, 95]) to set the
whiskers at specific percentiles of the data. Finally,
whis
can be the string
'range'
to force the whiskers to the
minimum and maximum of the data. In the edge case that the 25th
and 75th percentiles are equivalent,
whis can be automatically
set to
'range'
via the
autorange option.
bootstrap : int, optional
Number of times the confidence intervals around the median
should be bootstrapped (percentile method).
labels : array-like, optional
Labels for each dataset. Length must be compatible with
dimensions of
X.
autorange : bool, optional (False)
When
True and the data are distributed such that the 25th and
75th percentiles are equal,
whis
is set to
'range'
such
that the whisker ends are at the minimum and maximum of the
data.
Returns
-------
bxpstats : list of dict
A list of dictionaries containing the results for each column
of data. Keys of each dictionary are the following:
======== ===================================
Key Value Description
======== ===================================
label tick label for the boxplot
mean arithemetic mean value
med 50th percentile
q1 first quartile (25th percentile)
q3 third quartile (75th percentile)
cilo lower notch around the median
cihi upper notch around the median
whislo end of the lower whisker
whishi end of the upper whisker
fliers outliers
======== ===================================
Notes
-----
Non-bootstrapping approach to confidence interval uses Gaussian-
based asymptotic approximation:
.. math::
\\mathrm{med} \\pm 1.57 \\times \\frac{\\mathrm{iqr}}{\\sqrt{N}}
General approach from:
McGill, R., Tukey, J.W., and Larsen, W.A. (1978) "Variations of
Boxplots", The American Statistician, 32:12-16.
"""
def _bootstrap_median(data, N=5000):
# determine 95% confidence intervals of the median
M = len(data)
percentiles = [2.5, 97.5]
bs_index = np.random.randint(M, size=(N, M))
bsData = data[bs_index]
estimate = np.median(bsData, axis=1, overwrite_input=True)
CI = np.percentile(estimate, percentiles)
return CI
def _compute_conf_interval(data, med, iqr, bootstrap):
if bootstrap is not None:
# Do a bootstrap estimate of notch locations.
# get conf. intervals around median
CI = _bootstrap_median(data, N=bootstrap)
notch_min = CI[0]
notch_max = CI[1]
else:
N = len(data)
notch_min = med - 1.57 * iqr / np.sqrt(N)
notch_max = med + 1.57 * iqr / np.sqrt(N)
return notch_min, notch_max
# output is a list of dicts
bxpstats = []
# convert X to a list of lists
X = _reshape_2D(X, "X")
ncols = len(X)
if labels is None:
labels = repeat(None)
elif len(labels) != ncols:
raise ValueError("Dimensions of labels and X must be compatible")
input_whis = whis
for ii, (x, label) in enumerate(zip(X, labels), start=0):
# empty dict
stats = {}
if label is not None:
stats['label'] = label
# restore whis to the input values in case it got changed in the loop
whis = input_whis
# note tricksyness, append up here and then mutate below
bxpstats.append(stats)
# if empty, bail
if len(x) == 0:
stats['fliers'] = np.array([])
stats['mean'] = np.nan
stats['med'] = np.nan
stats['q1'] = np.nan
stats['q3'] = np.nan
stats['cilo'] = np.nan
stats['cihi'] = np.nan
stats['whislo'] = np.nan
stats['whishi'] = np.nan
stats['med'] = np.nan
continue
# up-convert to an array, just to be safe
x = np.asarray(x)
# arithmetic mean
stats['mean'] = np.mean(x)
# medians and quartiles
q1, med, q3 = np.percentile(x, [25, 50, 75])
# interquartile range
stats['iqr'] = q3 - q1
if stats['iqr'] == 0 and autorange:
whis = 'range'
# conf. interval around median
stats['cilo'], stats['cihi'] = _compute_conf_interval(
x, med, stats['iqr'], bootstrap
)
# lowest/highest non-outliers
if np.isscalar(whis):
if np.isreal(whis):
loval = q1 - whis * stats['iqr']
hival = q3 + whis * stats['iqr']
elif whis in ['range', 'limit', 'limits', 'min/max']:
loval = np.min(x)
hival = np.max(x)
else:
raise ValueError('whis must be a float, valid string, or list '
'of percentiles')
else:
loval = np.percentile(x, whis[0])
hival = np.percentile(x, whis[1])
# get high extreme
wiskhi = np.compress(x <= hival, x)
if len(wiskhi) == 0 or np.max(wiskhi) < q3:
stats['whishi'] = q3
else:
stats['whishi'] = np.max(wiskhi)
# get low extreme
wisklo = np.compress(x >= loval, x)
if len(wisklo) == 0 or np.min(wisklo) > q1:
stats['whislo'] = q1
else:
stats['whislo'] = np.min(wisklo)
# compute a single array of outliers
stats['fliers'] = np.hstack([
np.compress(x < stats['whislo'], x),
np.compress(x > stats['whishi'], x)
])
# add in the remaining stats
stats['q1'], stats['med'], stats['q3'] = q1, med, q3
return bxpstats
# FIXME I don't think this is used anywhere
@deprecated('2.1')
def unmasked_index_ranges(mask, compressed=True):
"""
Find index ranges where *mask* is *False*.
*mask* will be flattened if it is not already 1-D.
Returns Nx2 :class:
numpy.ndarray with each row the start and stop
indices for slices of the compressed :class:
numpy.ndarray
corresponding to each of *N* uninterrupted runs of unmasked
values. If optional argument *compressed* is *False*, it returns
the start and stop indices into the original :class:
numpy.ndarray,
not the compressed :class:
numpy.ndarray. Returns *None* if there
are no unmasked values.
Example::
y = ma.array(np.arange(5), mask = [0,0,1,0,0])
ii = unmasked_index_ranges(ma.getmaskarray(y))
# returns array [[0,2,] [2,4,]]
y.compressed()[ii[1,0]:ii[1,1]]
# returns array [3,4,]
ii = unmasked_index_ranges(ma.getmaskarray(y), compressed=False)
# returns array [[0, 2], [3, 5]]
y.filled()[ii[1,0]:ii[1,1]]
# returns array [3,4,]
Prior to the transforms refactoring, this was used to support
masked arrays in Line2D.
"""
mask = mask.reshape(mask.size)
m = np.concatenate(((1,), mask, (1,)))
indices = np.arange(len(mask) + 1)
mdif = m[1:] - m[:-1]
i0 = np.compress(mdif == -1, indices)
i1 = np.compress(mdif == 1, indices)
assert len(i0) == len(i1)
if len(i1) == 0:
return None # Maybe this should be np.zeros((0,2), dtype=int)
if not compressed:
return np.concatenate((i0[:, np.newaxis], i1[:, np.newaxis]), axis=1)
seglengths = i1 - i0
breakpoints = np.cumsum(seglengths)
ic0 = np.concatenate(((0,), breakpoints[:-1]))
ic1 = breakpoints
return np.concatenate((ic0[:, np.newaxis], ic1[:, np.newaxis]), axis=1)
# The ls_mapper maps short codes for line style to their full name used by
# backends; the reverse mapper is for mapping full names to short ones.
ls_mapper = {'-': 'solid', '--': 'dashed', '-.': 'dashdot', ':': 'dotted'}
ls_mapper_r = {v: k for k, v in six.iteritems(ls_mapper)}
@deprecated('2.2')
def align_iterators(func, *iterables):
"""
This generator takes a bunch of iterables that are ordered by func
It sends out ordered tuples::
(func(row), [rows from all iterators matching func(row)])
It is used by :func:
matplotlib.mlab.recs_join to join record arrays
"""
class myiter:
def __init__(self, it):
self.it = it
self.key = self.value = None
self.iternext()
def iternext(self):
try:
self.value = next(self.it)
self.key = func(self.value)
except StopIteration:
self.value = self.key = None
def __call__(self, key):
retval = None
if key == self.key:
retval = self.value
self.iternext()
elif self.key and key > self.key:
raise ValueError("Iterator has been left behind")
return retval
# This can be made more efficient by not computing the minimum key for each
# iteration
iters = [myiter(it) for it in iterables]
minvals = minkey = True
while True:
minvals = ([_f for _f in [it.key for it in iters] if _f])
if minvals:
minkey = min(minvals)
yield (minkey, [it(minkey) for it in iters])
else:
break
def contiguous_regions(mask):
"""
Return a list of (ind0, ind1) such that mask[ind0:ind1].all() is
True and we cover all such regions
"""
mask = np.asarray(mask, dtype=bool)
if not mask.size:
return []
# Find the indices of region changes, and correct offset
idx, = np.nonzero(mask[:-1] != mask[1:])
idx += 1
# List operations are faster for moderately sized arrays
idx = idx.tolist()
# Add first and/or last index if needed
if mask[0]:
idx = [0] + idx
if mask[-1]:
idx.append(len(mask))
return list(zip(idx[::2], idx[1::2]))
def is_math_text(s):
# Did we find an even number of non-escaped dollar signs?
# If so, treat is as math text.
try:
s = six.text_type(s)
except UnicodeDecodeError:
raise ValueError(
"matplotlib display text must have all code points < 128 or use "
"Unicode strings")
dollar_count = s.count(r'$') - s.count(r'\$')
even_dollars = (dollar_count > 0 and dollar_count % 2 == 0)
return even_dollars
def _to_unmasked_float_array(x):
"""
Convert a sequence to a float array; if input was a masked array, masked
values are converted to nans.
"""
if hasattr(x, 'mask'):
return np.ma.asarray(x, float).filled(np.nan)
else:
return np.asarray(x, float)
def _check_1d(x):
'''
Converts a sequence of less than 1 dimension, to an array of 1
dimension; leaves everything else untouched.
'''
if not hasattr(x, 'shape') or len(x.shape) < 1:
return np.atleast_1d(x)
else:
try:
x[:, None]
return x
except (IndexError, TypeError):
return np.atleast_1d(x)
def _reshape_2D(X, name):
"""
Use Fortran ordering to convert ndarrays and lists of iterables to lists of
1D arrays.
Lists of iterables are converted by applying
np.asarray to each of their
elements. 1D ndarrays are returned in a singleton list containing them.
2D ndarrays are converted to the list of their *columns*.
*name* is used to generate the error message for invalid inputs.
"""
# Iterate over columns for ndarrays, over rows otherwise.
X = np.atleast_1d(X.T if isinstance(X, np.ndarr
