All Questions
Tagged with python python-3.x
98 questions
5
votes
2
answers
662
views
Why did Python designers decide not to declare vars? [closed]
In Python when you want a local variable, you just assign to it x = 10.
In most modern languages you declare local vars (regardless of type):
JavaScript: let/const/var
Swift: let/var
Kotlin: val/var
...
- 235
-3
votes
2
answers
3k
views
Is it better practice to set default values for optional argparse arguments?
I mention python's argparse as an example but this would apply to any CLI argument parser library for any language. Just generally speaking, at a high level, if there are a lot of optional arguments ...
- 109
21
votes
6
answers
6k
views
Does subclassing int to forbid negative integers break Liskov Substitution Principle?
In Python 3, I subclassed int to forbid the creation of negative integers:
class PositiveInteger(int):
def __new__(cls, value):
if value <= 0:
raise ValueError("value ...
- 321
2
votes
1
answer
3k
views
How to add some data to an Enum in Python
I have a class that I use to define different types of plots I am performing
class MyPlots(Enum):
STANDARDSCALE = "standard"
LOGSCALE = "log"
there are default values ...
- 39
-1
votes
1
answer
2k
views
Are there different ways in Python to decorate class methods that dynamically assign themselves to a dict within the class?
Here's what I'd like to do in the form of working code, since it's difficult for me to explain otherwise:
from typing import Callable, Generic, TypeVar
from typing_extensions import Self
# The type ...
0
votes
3
answers
2k
views
Python best practice when logging optional arguments
I have a method that accepts one or more optional arguments and I'd like to log them, following the best practice of lazy interpolation of log values:
def frobnicate(a: str, b: int, c: typing.Optional[...
- 109
13
votes
6
answers
11k
views
Is it reasonable to use dictionaries instead of arguments?
In python I often see functions with a lot of arguments. For example:
def translate(a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p):
// some code
return(x, y, z)
I like this pattern in some ...
- 323
2
votes
1
answer
3k
views
Type-hinting and accessing values that are not initialized in __init__ (Python)
Suppose I have an instance attribute that I don't initialize in __init__, but in normal use it should be initialized before any other methods use the value. I want to structure everything so that it ...
- 139
24
votes
8
answers
7k
views
Is using lambdas to express intent not pythonic?
PEP 8 states the following about using anonymous functions (lambdas)
Always use a def statement instead of an assignment statement that
binds a lambda expression directly to an identifier:
# Correct: ...
- 351
1
vote
1
answer
171
views
legacy refactor and churn
I am trying to work on finding the following metrics
New Work - totally new code which does not replace other code.
Churn - code that is rewritten or deleted after being written
Help Others - where ...
- 141
2
votes
2
answers
5k
views
Alternative to using regex in Python
Background
I do programming with Python and now and then i run into a situation where i have to use regex
Typically i try to learn a bit about it and look at examples of doing things similar to what i'...
- 479
-1
votes
1
answer
2k
views
Python generating payload and parsing payload
(Using python) I am looking to generate a bytes (or can be string that I convert to bytes) that is a message to send over TCP. The format is [Header][Length][Payload].
Within [Header] is a [...
- 199
3
votes
2
answers
1k
views
Python import order, mixing from ... import ... and import ... (and import ... as ...)
This is the mess of imports currently at the top of my file:
import argparse
from copy import deepcopy
from functools import cmp_to_key, partial
from itertools import chain
import math
from ...
user224123
1
vote
0
answers
203
views
Combine/Sync Amazon S3 and MongoDB Atlas with Elastic Search
I have many continuously growing (through scrapping) collections in MongoDB Atlas. The documents in each collection follows the following schema:
{
"source_url": "<some url on the web>",
"html":...
- 111
-1
votes
1
answer
397
views
Is Python's Django WebFramework good to design Expert System as a Web App?
I hope everyone is good. Well, I am at the end of my degree BS (Software Engineering), and in the third Phase of my Final Year Project named as 'Test Phase'.
My Project is to build an Expert System ...
- 173