Jul-08-2017, 05:55 PM
(Jul-08-2017, 01:44 PM)rahul1913 Wrote: >>> dir(os) | grep system
Interesting idea. I had this idea over and over with generators. Piping generators together like shell commands in a shell.
The funny thing is, that you can make it possible in Python.
This example includes: custom Exception, raising exceptions, defining behavior with __ror__, using a dict like a switch statement, generator, context manager
import types
class GrepError(Exception):
pass
class Grep:
def __init__(self, search_string):
self.search_string = search_string
def __ror__(self, other):
action = {
types.ModuleType: dir,
list: iter,
tuple: iter,
dict: iter,
set: iter,
str: self.__file,
}
function = action.get(type(other))
if function is None:
raise GrepError('{} is not supported'.format(type(other)))
iterable = function(other)
for entry in iterable:
if self.search_string in entry:
yield entry
def __file(self, path):
with open(path) as fd:
for line in fd:
yield lineA stripped down solution which supports only ModuleType and without error checking, just for better understanding what happens.class Grep:
def __init__(self, search_string):
self.search_string = search_string
def __ror__(self, other):
for entry in dir(other):
if self.search_string in entry:
yield entrylist('/var/log/pacman.log' | grep('error'))
import os
list(os | grep('spa'))Output:['_fspath',
'_spawnvef',
'fspath',
'spawnl',
'spawnle',
'spawnlp',
'spawnlpe',
'spawnv',
'spawnve',
'spawnvp',
'spawnvpe']
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