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
>>> 

在Linux、Mac OS X和其他POSIX系统上，使用带版本控制的Python命令和-m开关来运行pip的适当副本:

python2.7 -m pip install SomePackage
python3.4 -m pip install SomePackage

(也可以使用版本适当的PIP命令)

在Windows上，将py Python启动器与-m开关结合使用:

py -2.7 -m pip install SomePackage  # specifically Python 2.7
py -3.4 -m pip install SomePackage  # specifically Python 3.4

如果py -3.4有错误，那么试试:

pip install SomePackage

如果你同时安装了python3.6和python3.7，并且希望在默认情况下对python3.7使用pip，那么你应该这样做:

首先，确保为python3.7安装了pip

python3.7 -m pip install -U pip

现在pip3.7必须可用，因此我们编辑.bashrc

nano ~/.bashrc

向它添加下面的行

alias pip=pip3.7

为了使更改生效，在shell中输入:

source ~/.bashrc

现在如果你输入:

pip --version

你应该得到:

PIP 20.1.1 from /usr/local/lib/python3.7/dist-packages/ PIP (python 3.7)

这意味着，如果你使用，例如:

pip install <package>

它将为python3.7安装<package>

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

搅拌机:

/usr/bin $ python3.7 -m pip install irc