Python 导入错误：没有名为 datetime 的模块
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ImportError: No module named datetime
提问by akbsmile
When I upgrade my Ubuntu into 14.04 from 12.04, this time I get this error:
当我将 Ubuntu 从 12.04 升级到 14.04 时，这次我收到此错误：
ImportError: No module named datetime
采纳答案by erjiang
This happened to me when I created a virtualenv and then upgraded from 12.04 to 14.04.
当我创建一个 virtualenv 然后从 12.04 升级到 14.04 时，这发生在我身上。
I had to delete my virtualenv and recreate it, and after doing that, everything worked again.
我不得不删除我的 virtualenv 并重新创建它，然后，一切又恢复了。
回答by akbsmile
I tried to re-install it by these steps.
我尝试通过这些步骤重新安装它。
1. remove the old version of venv
2. virtualenv venv
3. .venv/activate/bin
4. pip install -r requirements/ requirements.txt
And it works perfectly. Thanks guys :)
它完美地工作。谢谢你们 ：）
回答by han058
Try...
尝试...
>>> import sys
>>> sys.path
[... '/usr/local/lib/python2.7/lib-dynload',...]
if lib-dynload not included in sys.path, You could not import datetime
如果 sys.path 中未包含 lib-dynload，则不能 import datetime
check it!
核实！
回答by artisare
Just run this command. It worked like a charm!
只需运行此命令。它就像一个魅力！
$ cp /usr/bin/python2.7 $(which python2.7)
This just happened to me after the 14.10 update, and it seems to be because my virtual environments have old copies of /usr/bin/python2.7that — unlike the new binary — do not include datetimebuilt-in, and so get an error when they cannot find it on disk anywhere. The new interpreter seems to import it without any file I/O (try running it under strace to check).
这只是在 14.10 更新后发生在我身上，似乎是因为我的虚拟环境有旧的副本/usr/bin/python2.7——不像新的二进制文件——不包括datetime内置的，所以当他们在磁盘上的任何地方都找不到它时会出错. 新的解释器似乎在没有任何文件 I/O 的情况下导入它（尝试在 strace 下运行它以进行检查）。
回答by Seg-mel
If you use virtualenv, updating it might solve this issue
如果您使用virtualenv，更新它可能会解决此问题
virtualenv /path/to/old/virtualenv/
回答by Hasan Ramezani
just reinitialize the virtualenv by:
只需通过以下方式重新初始化 virtualenv：
cd <virtualenv-dir>
virtualenv .
回答by Walter B
Same happened to me on upgrading Ubuntu from 14.04 to 15.10.
在将 Ubuntu 从 14.04 升级到 15.10 时，我也遇到了同样的情况。
I solved it by upgrading pip and then removing and recreating the virtual env:
我通过升级 pip 然后删除并重新创建虚拟环境来解决它：
$ easy_install --upgrade pip
$ rmvirtualenv <my_virtual_env>
$ mkvirtualenv <my_virtual_env>
(I use virtualenvwrapper)
（我使用 virtualenvwrapper）
回答by Aneesh R S
clear virtual env, consider VIRTUAL is the name of the virtual environment
virtualenv --clear VIRTUAL
Now activate it and install from requirements.txt
source VIRTUAL/bin/activate pip install -r requirements.txt
清除虚拟环境，考虑 VIRTUAL 是虚拟环境的名称
virtualenv --clear 虚拟
现在激活它并从 requirements.txt 安装
source VIRTUAL/bin/activate pip install -r requirements.txt
回答by dug
If by chance you come across this error while trying to renew your LetsEncrypt certificate (like I did) I found the solution here:
如果您在尝试更新 LetsEncrypt 证书时偶然遇到此错误（就像我所做的那样），我在这里找到了解决方案：
https://askubuntu.com/a/850669/668101
https://askubuntu.com/a/850669/668101
Remove this folder and rerun LetsEncrypt and it will recreate all the relevant files and avoid the error from this thread.
删除此文件夹并重新运行 LetsEncrypt，它将重新创建所有相关文件并避免此线程中的错误。
rm ~/.local/share/letsencrypt -R
回答by Artur Samigullin
If you face datetime import issue using IntelliJ PyCharm or Idea and from Console/Terminal it works fine, you should just duplicate/recreate running configurations.
如果您使用 IntelliJ PyCharm 或 Idea 遇到日期时间导入问题并且从控制台/终端它工作正常，您应该只复制/重新创建运行配置。
![Python pip 安装失败并显示“连接错误：[SSL: CERTIFICATE_VERIFY_FAILED] 证书验证失败 (_ssl.c:598)”](/res/img/loading.gif)