|
Search Results
|
| Post |
Author |
Forum |
Replies |
Views |
Posted
[asc]
|
| |
|
Thread: reading a file like the unix tail -f command does
Post: RE: reading a file like the unix tail -f command d...
| I suggest to read David Beazley's presentation Generator Tricks for Systems Programmers.
On slides 74, 75, 76 there is example of tail -f implementation in Python. Following is excerpt from these sli... |
|
perfringo |
News and Discussions |
2 |
313 |
Mar-29-2024, 09:31 AM |
| |
|
Thread: a better way to code this to fix a URL?
Post: RE: a better way to code this to fix a URL?
| It seems that url will always contain // so why not just split and join and not bother whether is missing something or not:
>>> urls = ["//example.com", "://example.com", "s://example.com", ... |
|
perfringo |
News and Discussions |
10 |
764 |
Mar-19-2024, 06:43 AM |
| |
|
Thread: list.sort() returning None
Post: RE: list.sort() returning None
| Reading documentation is always a good idea:
Quote: list.sort(*, key=None, reverse=False)
Sort the items of the list in place (the arguments can be used for sort customization, see sorted() for their... |
|
perfringo |
General Coding Help |
8 |
601 |
Mar-18-2024, 05:48 AM |
| |
|
Thread: using > < for tuple , list,...
Post: RE: using > < for tuple , list,...
| From documentation (Value Comparisons):
Quote:Sequences compare lexicographically using comparison of corresponding elements.
This means that order is important. This makes sense in strings (this is... |
|
perfringo |
General Coding Help |
3 |
487 |
Feb-05-2024, 12:31 PM |
| |
|
Thread: [subprocess] Why stdout sent to stderr?
Post: RE: [subprocess] Why stdout sent to stderr?
| I would be surprised if Python knows anything about run. However subprocess.run is another story. |
|
perfringo |
General Coding Help |
3 |
485 |
Jan-25-2024, 09:34 PM |
| |
|
Thread: all of attributes and methods related to a special type
Post: RE: all of attributes and methods related to a spe...
| (Jan-19-2024, 07:58 AM)akbarza Wrote: In IDLE, I typed list. and then pressed the tab key twice, it became list. and popped up a small window that contained all methods related to the list type. I ... |
|
perfringo |
General Coding Help |
4 |
492 |
Jan-19-2024, 01:11 PM |
| |
|
Thread: all of attributes and methods related to a special type
Post: RE: all of attributes and methods related to a spe...
| (Jan-18-2024, 06:48 AM)akbarza Wrote: how can I see all attributes and methods related to a special type? for example, I want to see all methods and attributes related to lists, how can I do it?
For... |
|
perfringo |
General Coding Help |
4 |
492 |
Jan-18-2024, 10:59 AM |
| |
|
Thread: Precision with Decimal Type
Post: RE: Precision with Decimal Type
| Some things to consider:
Documentation > 6.Modules > 6.1. More on modules
Quote:Note that in general the practice of importing * from a module or package is frowned upon, since it often causes ... |
|
perfringo |
General Coding Help |
9 |
751 |
Jan-17-2024, 07:57 AM |
| |
|
Thread: Stuck with using lists to solve task
Post: RE: Stuck with using lists to solve task
| If using 0 and 1 to represent closed / open doors it's simple to toggle value using XOR (bitwise exclusive OR). Something along those lines (just an idea, haven't tested it):
# 1 means door open, 0 m... |
|
perfringo |
Homework |
9 |
840 |
Jan-15-2024, 07:46 PM |
| |
|
Thread: Why doesn't list require global keyword?
Post: RE: Why doesn't list require global keyword?
| (Jan-15-2024, 01:35 AM)johnywhy Wrote: Unclear. x is mutable. I can say
x+=1
It's always good idea to read documentation:
3. Data model > 3.1.1. Objects, values and types:
Quote:The value of ... |
|
perfringo |
General Coding Help |
9 |
834 |
Jan-15-2024, 08:36 AM |
| |
|
Thread: partial functions before knowing the values
Post: RE: partial functions before knowing the values
| According to PEP 484 shouldn’t this be the intended way:
def spam(*args: int):
# do_something |
|
perfringo |
General Coding Help |
4 |
617 |
Dec-24-2023, 10:00 AM |
| |
|
Thread: Can't Find Python (or Something)
Post: RE: Can't Find Python (or Something)
| Too little information (for example how have you tried to run the code) but this should be self explanatory:
Quote:zsh: command not found: python
I have verified with the command python3 --version th... |
|
perfringo |
General Coding Help |
2 |
549 |
Nov-26-2023, 07:12 AM |
| |
|
Thread: Grades Code":
Post: RE: Grades Code":
| Just for fun:
>>> [int(input(f"Enter mark {i}: ")) for i in range(1, 6)]
Enter mark 1: 10
Enter mark 2: 20
Enter mark 3: 30
Enter mark 4: 40
Enter mark 5: 50
[10, 20, 30, 40, 50] |
|
perfringo |
Homework |
14 |
1,418 |
Nov-22-2023, 12:30 PM |
| |
|
Thread: Create X Number of Variables and Assign Data
Post: RE: Create X Number of Variables and Assign Data
| I concur that dictionary or list is the way to go.
One way to create dictionary from sentence can be dictionary comprehension:
>>> sentence = "All work and no play makes Jack a dull boy."
... |
|
perfringo |
General Coding Help |
8 |
973 |
Nov-14-2023, 08:46 AM |
| |
|
Thread: usage of ^ in f_string
Post: RE: usage of ^ in f_string
| Search is very wide subject and "how" depends on very many factors.
For Python I personally follow this pattern:
1 Search Python built-in help
2. Search Python documentation at python.org
3. Search ... |
|
perfringo |
General Coding Help |
7 |
931 |
Nov-09-2023, 01:15 PM |
| |
|
Thread: usage of ^ in f_string
Post: RE: usage of ^ in f_string
| It's always a good idea to read documentation: Format String Syntax and Format Specification Mini-Language
Quote:Three conversion flags are currently supported: '!s' which calls str() on the value, '... |
|
perfringo |
General Coding Help |
7 |
931 |
Nov-07-2023, 08:51 AM |
| |
|
Thread: problem in using generator
Post: RE: problem in using generator
| This is not generator specific.
() signals to Python that this is a callable object and should be called. Python tries to do it.
If you call it second time then it depends what first callable ret... |
|
perfringo |
General Coding Help |
2 |
546 |
Nov-07-2023, 08:40 AM |
| |
|
Thread: difference between statement and expression
Post: RE: difference between statement and expression
| It's always a good idea to start with documentation:
Expression:
Quote:A piece of syntax which can be evaluated to some value. In other words, an expression is an accumulation of expression elements... |
|
perfringo |
General Coding Help |
6 |
865 |
Oct-16-2023, 12:48 PM |
| |
|
Thread: replace text in a txt
Post: RE: replace text in a txt
| One way is to define required replacements in dictionary, then iterate over rows in file, split row to words and replace if needed or keep and write to new file. I haven't tested it but something like... |
|
perfringo |
General Coding Help |
19 |
2,249 |
Oct-12-2023, 09:43 AM |
| |
|
Thread: problem in using enumerate
Post: RE: problem in using enumerate
| (Oct-11-2023, 09:52 AM)akbarza Wrote: I have not seen * before in such syntax. what is it doing and for what is it used?
This is iterable unpacking as described in PEP448. It is convenient and conci... |
|
perfringo |
General Coding Help |
4 |
799 |
Oct-11-2023, 10:55 AM |
