大约有 5,685 项符合查询结果（耗时：0.0215秒） [XML]
List all virtualenv
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If you are using virtualenv or Python 3's built in venv the above answers might not work.
If you are on Linux, just locate the activate script that is always present inside a env.
locate -b '\activate' | grep "/home"
This will grab all Python virtual envi...
How to stop Flask from initialising twice in Debug Mode? [duplicate]
When building a Flask service in Python and setting the debug mode on, the Flask service will initialise twice. When the initialisation loads caches and the like, this can take a while. Having to do this twice is annoying when in development (debug) mode. When debug is off, the Flask service only in...
Local (?) variable referenced before assignment [duplicate]
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Not the answer you're looking for? Browse other questions tagged python python-3.x or ask your own question.
Automatically creating directories with file output [duplicate]
...d the os.makedirs calls, so that to protect us from race conditions.
In Python 3.2+, there is a more elegant way that avoids the race condition above:
import os
filename = "/foo/bar/baz.txt"
os.makedirs(os.path.dirname(filename), exist_ok=True)
with open(filename, "w") as f:
f.write("FOOBAR...
How to convert a date string to different format [duplicate]
I need to convert date string "2013-1-25" to string "1/25/13" in python.
I looked at the datetime.strptime but still can't find a way for this.
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Get filename from file pointer [duplicate]
...')
>>> os.path.basename(f.name)
'bar.txt'
File object docs (for Python 2) here.
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Remove final character from string [duplicate]
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What you are trying to do is an extension of string slicing in Python:
Say all strings are of length 10, last char to be removed:
>>> st[:9]
'abcdefghi'
To remove last N characters:
>>> N = 3
>>> st[:-N]
'abcdefg'
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解决Scrapy警告:You do not have a working installation of the service_i...
...要安装一个模块service_identity，根据提示地址（https: pypi python org pypi service_identity）来安装 使用scrapy进行爬虫项目的操作时，出现如下错误：
从提示错误来看，我们需要安装一个模块service_identity，根据提示地址（https://pypi.py...
解决Scrapy警告:You do not have a working installation of the service_i...
...要安装一个模块service_identity，根据提示地址（https: pypi python org pypi service_identity）来安装 使用scrapy进行爬虫项目的操作时，出现如下错误：
从提示错误来看，我们需要安装一个模块service_identity，根据提示地址（https://pypi.py...
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