为什么是“-m"需要“python -m pip install ..."? [英] Why is "-m" needed for "python -m pip install ..."?

问题描述

我最近使用 pip 在 python 2.7 中安装 requests 包，但是为了这样做我不得不使用:

python -m pip 安装请求

而不仅仅是:

python pip 安装请求

这给了我一个错误:

<块引用>

无法打开文件 'pip: [Errno 2] 没有那个文件或目录

为什么我需要添加-m?

解决方案

python -m pip 告诉 python 以 pip 模块作为主模块运行.

python pip 不被理解，因为 pip 不是 python 理解的命令行参数(即，pip 是一个模块).

如果 python 脚本目录(c:\python27\scripts for python 2.7 on windows)在你的路径上，那么你可以运行 pip(没有 python 之前)并传递您将传递给 python -m pip 的相同选项.

所以:您需要添加 -m pip 以便 python 知道使用哪个模块作为主模块.pip 是安装在 python 脚本目录中的独立程序，不是 python 的参数.

I recently used pip to install the requests package in python 2.7, however in order to do so I had to use:

python -m pip install requests 

instead of just:

python pip install requests

which gave me an error:

can't open file 'pip: [Errno 2] No such file or directory

Why did I need to add the -m?

解决方案

python -m pip tells python to run with the pip module as the main module.

python pip isn't understood, because pip isn't a command line argument that python understands (i.e., pip is a module).

If the python scripts directory (c:\python27\scripts for python 2.7 on windows) is on your path, then you can just run pip (without python before it) and pass the same options you would pass to python -m pip.

So: you need to add -m pip so python knows what module to use as the main module. pip is a standalone program installed in your python scripts directory, not an argument to python.

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