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Circular (or cyclic) imports in Python
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As of now, the only reference to circular imports in python3 "What's new?" pages is in the 3.5 one. It says "Circular imports involving relative imports are now supported". @meawoppl have you found anything else what is not listed in these pages?
– zezoll...
What's the difference between lists enclosed by square brackets and parentheses in Python?
...ove 'y=x' example , list and tuple behave in the same way now (verified in python3.8.5)
– Youjun Hu
Aug 15 at 9:11
add a comment
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Which is the preferred way to concatenate a string in Python?
...building it up over a lot of operations.
from cStringIO import StringIO
# python3: from io import StringIO
buf = StringIO()
buf.write('foo')
buf.write('foo')
buf.write('foo')
buf.getvalue()
# 'foofoofoo'
If you already have a complete list returned to you from some other operation, then just ...
Linux C/C++程序常用的调试手段及异常排查总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
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性能如何
是否有一些执行耗时的操作，I/O，网络文件下载，文件解析等，是否可以进行优化？是否会影响到功能体验？使用异步线程执行会更好吗？
多线程相关
是否涉及到多线程，临界区访问是否正常？会引入多线程...
What character to use to put an item at the end of an alphabetic list?
...No, "Ω, 末, 口…" are not non-printable characters, silly. Upgrade to Python3 already. ;)
– Gringo Suave
Feb 15 '19 at 17:57
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How do I mock an open used in a with statement (using the Mock framework in Python)?
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Note: in Python3 the builtin file is gone!
– exhuma
Apr 28 '14 at 9:16
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Converting a column within pandas dataframe from int to string
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Regarding @JohnZwinck's comment, using Python3 it seems to be more like 2x as fast to use apply() instead of astype(): timeit.Timer('c.apply(str)', setup='import pandas as pd; c = pd.Series(range(1000))').timeit(1000) >>> 0.41499893204309046 ...
How can you get the SSH return code using Paramiko?
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Thanks for JanC, I added some modification for the example and tested in Python3, it really useful for me.
import paramiko
import getpass
pw = getpass.getpass()
client = paramiko.SSHClient()
client.set_missing_host_key_policy(paramiko.WarningPolicy())
#client.set_missing_host_key_policy(paramik...
How can I check if character in a string is a letter? (Python)
... False
� False
� False
� False
� False
� False
>>>
In python3.x:
>>> s = 'a1中文'
>>> for char in s: print(char, char.isalpha())
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a True
1 False
中 True
文 True
>>>
This code work:
>>> def is_alpha(word):
... try:
... re...
Python 3.x rounding behavior
... if copied into an interpreter for further documentation.
#! /usr/bin/env python3
# -*- coding: utf-8 -*-
def trueround(number, places=0):
'''
trueround(number, places)
example:
>>> trueround(2.55, 1) == 2.6
True
uses standard functions with no import to...