python-2.7 - 即使已安装，也没有名为 gevent 的模块

Question

操作系统:Ubuntu 16.04
python 2.7

pip list | grep gev
DEPRECATION: The default format will switch to columns in the future. You can use --format=(legacy|columns) (or define a format=(legacy|columns) in your pip.conf under the [list] section) to disable this warning.
gevent (1.3a2)

为了确保，我检查了:

  pip install --upgrade gevent
Requirement already up-to-date: gevent in /home/user/.local/lib/python2.7/site-packages
Requirement already up-to-date: greenlet>=0.4.13; platform_python_implementation == "CPython" in /home/user/.local/lib/python2.7/site-packages (from gevent)

但是，当我实际运行我的 python 程序时，它会因错误而退出:

 import gevent
ImportError: No module named gevent

请指教。

我已经尝试过的东西:

pip --version
pip 9.0.1 from /home/user/.local/lib/python2.7/site-packages (python 2.7)


python -m pip install --user gevent
Requirement already satisfied: gevent in /home/user/.local/lib/python2.7/site-packages
Requirement already satisfied: greenlet>=0.4.13; platform_python_implementation == "CPython" in /home/user/.local/lib/python2.7/site-packages (from gevent)

which -a python
/usr/bin/python
/usr/bin/python

连同这里提到的事情:
https://github.com/PokeAlarm/PokeAlarm/issues/22

我还尝试卸载 pip 安装并执行 apt-get :

sudo apt-get install python-gevent python-gevent-websocket

这里提到:https://askubuntu.com/questions/836029/importerror-no-module-named-gevent/1013457#1013457

Answer 1

在 Ubuntu 16.04 的 Python 虚拟环境中工作，我得到以下结果:

$ python -m pip install gevent 
Requirement already satisfied: gevent in ./lib/python2.7/site-packages  
Requirement already satisfied: greenlet>=0.4.10 in ./lib/python2.7/site-packages (from gevent)

import gevent worked successfully in my Python virtual environment, but it did not work outside of my Python virtual environment until I ran the following command:

sudo apt install python-gevent # also works in all currently supported versions of Ubuntu 

说明:gevent 是一个基于协程的 Python 网络库。 gevent 使用 greenlet 在 libevent 事件循环之上提供高级同步 API。
您还可以通过运行以下命令在所有当前支持的 Ubuntu 版本中为 Python 3.x 安装 python3-gevent:

sudo apt install python3-gevent