5,597 questions
769
votes
6
answers
340k
views
Are dictionaries ordered in Python 3.6+?
Dictionaries are insertion ordered as of Python 3.6. It is described as a CPython implementation detail rather than a language feature. The documentation states:
dict() now uses a “compact” ...
- 41.4k
308
votes
5
answers
304k
views
Multiline f-string in Python
I'm trying to write PEP-8 compliant code for a domestic project and I have a line with an f-string that is more than 80 characters long:
def __str__(self):
return f'{self.data} - {self.time},\...
- 4,072
260
votes
6
answers
345k
views
ModuleNotFoundError: What does it mean __main__ is not a package? [duplicate]
I am trying to run a module from the console. The structure of my directory is this:
I am trying to run the module p_03_using_bisection_search.py, from the problem_set_02 directory using:
$ python3 ...
- 70.3k
190
votes
22
answers
193k
views
Why Python 3.6.1 throws AttributeError: module 'enum' has no attribute 'IntFlag'?
I just installed Python 3.6.1 for MacOS X
When I attempt to run the Console(or run anything with Python3), this error is thrown:
AttributeError: module 'enum' has no attribute 'IntFlag'
$ /...
- 12.3k
190
votes
8
answers
616k
views
How can I convert a .py to .exe for Python?
I'm trying to convert a fairly simple Python program to an executable and couldn't find what I was looking for, so I have a few questions (I'm running Python 3.6):
The methods of doing this that I ...
- 1,929
159
votes
1
answer
64k
views
In Python format (f-string) strings, what does !r mean? [duplicate]
I get what the new f strings in python 3.6 do, but what about the ending !r as found in the code snip below.
def __repr__(self):
return (f'Pizza({self.radius!r}, 'f'{self.ingredients!r})')
- 1,871
155
votes
1
answer
183k
views
Rounding floats with f-string [duplicate]
Using %-formatting, I can specify the number of decimal cases in a string:
x = 3.14159265
print('pi = %0.2f' %x)
This would give me:
pi = 3.14
Is there any way of doing this using f-strings in ...
- 1,757
148
votes
2
answers
161k
views
cannot write mode RGBA as JPEG
I am learning to use 'pillow 5.0' following book 'Automate the boring stuff with python'
The info about the image object
In [79]: audacious = auda
In [80]: print(audacious.format, audacious.size, ...
user9062604
144
votes
5
answers
109k
views
Understanding __init_subclass__
I finally upgraded my python version and I was discovering the new features added. Among other things, I was scratching my head around the new __init_subclass__ method. From the docs:
This method is ...
- 2,606
139
votes
16
answers
575k
views
Pip error: Microsoft Visual C++ 14.0 is required
I just ran the following command:
pip install -U steem
and the installation worked well until it failed to install pycrypto.
Afterwards I did the
pip install cryptography
command because I thought ...
- 1,595
134
votes
6
answers
158k
views
ModuleNotFoundError: No module named 'distutils.core'
This question asks: "I do everything right, but nothing happens!" See this question for getting technical info about how to solve the direct cause of this error message.
I've recently ...
- 18.8k
104
votes
17
answers
78k
views
What are use cases for nested f-strings [closed]
Thanks to David Beazley's tweet, I've recently found out that the new Python 3.6 f-strings can also be nested:
>>> price = 478.23
>>> f"{f'${price:0.2f}':*>20s}"
'*************$...
- 475k
98
votes
5
answers
161k
views
Python3.6 AttributeError: module 'asyncio' has no attribute 'run'
I tried to read https://hackernoon.com/asynchronous-python-45df84b82434.
It's about asynchronous python and I tried the code from this, but I'm getting a weird Error.
The code is:
`
import asyncio
...
- 1,163
97
votes
1
answer
61k
views
what does --enable-optimizations do while compiling python?
I'm trying to compile Python 3.6 on an arm based Linux machine,
./configure outputs this:
If you want a release build with all optimizations active (LTO, PGO, etc),
please run ./configure --...
- 2,723
89
votes
5
answers
130k
views
How to call a async function from a synchronized code Python
So I'm locked to a python 3.6.2 interpreter that follows my desktop application.
What I want is to call an async function from a synchronized method or function.
When calling the python function from ...
- 1,307