您可以使用以下命令之一:

pip2 install SomePackage
pip3 install SomePackage

python2 -m pip install SomePackage  
python3 -m pip install SomePackage 

当然，还要确保安装了正确的pip版本

sudo apt-get install python-pip
sudo apt-get install python3-pip

我自己没有使用过这些命令，但是上面的一些回答建议使用它们来指定你想使用的python版本

pip-2.7 install SomePackage
python-3.6 -m pip install SomePackage

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
>>> 

具体到windows: \path\to\python.exe -m pip install PackageName works

我自己最近也遇到了这个问题，发现在我的Linux系统上，Python 2也没有得到正确的Python 3的pip。

首先，你必须确保已经为你的python版本安装了pip:

对于Python 2:

sudo apt-get install python-pip

对于Python 3:

sudo apt-get install python3-pip

然后，要安装一个版本的Python或其他版本的包，只需在Python 2中使用以下命令:

pip install <package>

或Python 3:

pip3 install <package>

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

/ / python2 /路径。{5,6} /path/to/pip install PackageName不正常?

为了在任何没有安装pip的python版本上工作，你需要下载pip并执行python*version* setup.py install。例如python3.3 setup.py install。这解决了注释中的导入错误。(@hbdgaf建议)