显然，easy_install和pip有多个版本。看起来很乱。不管怎样，这是我在Ubuntu 12.10上安装Django for Python 2.7的方法:

$ sudo easy_install-2.7 pip
Searching for pip
Best match: pip 1.1
Adding pip 1.1 to easy-install.pth file
Installing pip-2.7 script to /usr/local/bin

Using /usr/lib/python2.7/dist-packages
Processing dependencies for pip
Finished processing dependencies for pip

$ sudo pip-2.7 install django
Downloading/unpacking django
  Downloading Django-1.5.1.tar.gz (8.0Mb): 8.0Mb downloaded
  Running setup.py egg_info for package django

    warning: no previously-included files matching '__pycache__' found under directory '*'
    warning: no previously-included files matching '*.py[co]' found under directory '*'
Installing collected packages: django
  Running setup.py install for django
    changing mode of build/scripts-2.7/django-admin.py from 644 to 755

    warning: no previously-included files matching '__pycache__' found under directory '*'
    warning: no previously-included files matching '*.py[co]' found under directory '*'
    changing mode of /usr/local/bin/django-admin.py to 755
Successfully installed django
Cleaning up...

$ python
Python 2.7.3 (default, Sep 26 2012, 21:51:14) 
[GCC 4.7.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import django
>>> 

显然，easy_install和pip有多个版本。看起来很乱。不管怎样，这是我在Ubuntu 12.10上安装Django for Python 2.7的方法:

$ sudo easy_install-2.7 pip
Searching for pip
Best match: pip 1.1
Adding pip 1.1 to easy-install.pth file
Installing pip-2.7 script to /usr/local/bin

Using /usr/lib/python2.7/dist-packages
Processing dependencies for pip
Finished processing dependencies for pip

$ sudo pip-2.7 install django
Downloading/unpacking django
  Downloading Django-1.5.1.tar.gz (8.0Mb): 8.0Mb downloaded
  Running setup.py egg_info for package django

    warning: no previously-included files matching '__pycache__' found under directory '*'
    warning: no previously-included files matching '*.py[co]' found under directory '*'
Installing collected packages: django
  Running setup.py install for django
    changing mode of build/scripts-2.7/django-admin.py from 644 to 755

    warning: no previously-included files matching '__pycache__' found under directory '*'
    warning: no previously-included files matching '*.py[co]' found under directory '*'
    changing mode of /usr/local/bin/django-admin.py to 755
Successfully installed django
Cleaning up...

$ python
Python 2.7.3 (default, Sep 26 2012, 21:51:14) 
[GCC 4.7.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import django
>>> 

PIP也是一个python包。因此，将模块安装到特定python版本的最简单方法如下所示

 python2.7 /usr/bin/pip install foo

or

python2.7 -m pip install foo

另一种可能的方法是使用conda和pip。有时你可能只想使用其中的一个，但如果你真的需要设置一个特定版本的python，我会将两者结合起来。

I create a starting conda enviroment with the python I want. As in here https://docs.conda.io/projects/conda/en/latest/user-guide/tasks/manage-environments.html. Alternatively you could set up the whole enviroment just using conda. conda create -n myenv python=3.6.4 Then activate your enviroment with the python you like. This command could change depending on the OS. source activae myenv Now you have your python active then you could continue using conda but if you need/want to use pip: python -m pip -r requirements.txt

这里有一种可能的方法。

要使用多个版本的pip，只需输入

Pip {version}和运行命令

示例:用于python 3.10

pip3.10 pip3.10列表

pip3.10

适用于Python 3.7

pip3.7 pip3.7列表

在Windows上，如果您选择在Python 3设置期间安装pip模块，则可以通过Python启动器py.exe使用给定的Python版本执行pip模块。

py -3 -m pip install packagename
py -2 -m pip install packagename

你可以更具体地请求Python的精确子版本:

py -3.6 -m pip install packagename

要获得通过启动程序可用的所有已安装Python版本的列表，请运行:

py --list

或者，您可以直接启动所需的Python可执行文件:

C:/path/to/specific/python.exe -m pip install packagename