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pip --version     # Command for Python 2.x
pip3 --version    # Command for Python 3.x

$ curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py   # Download the installation script
$ sudo python get-pip.py    # Run the installation script

$ sudo python3 get-pip.py    # Run the installation script.

sudo apt-get install python-pip

pip --version

pip --help

pip install -U pip

sudo easy_install --upgrade pip

pip install SomePackage              # Latest version
pip install SomePackage==1.0.4       # Specific version
pip install 'SomePackage>=1.0.4'     # Minimum version

pip install Django==1.7

pip install --upgrade SomePackage

pip uninstall SomePackage

pip search SomePackage

pip show

pip show -f SomePackage

pip list

pip list -o

pip install --upgrade pip    # Python 2.x
pip3 install --upgrade pip   # Python 3.x

python -m pip install -U pip   # Python 2.x
python -m pip3 install -U pip    # Python 3.x

pip install -i https://pypi.tuna.tsinghua.edu.cn/simple some-package

pip install -i https://pypi.tuna.tsinghua.edu.cn/simple Django

pip install pip -U
pip config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple

pip install -i https://pypi.tuna.tsinghua.edu.cn/simple pip -U

python2 -m pip install XXX

python3 -m pip install XXX

pip install -i http://pypi.douban.com/simple --trusted-host pypi.douban.com packagename # packagename is the name of the package to download
pip install -i http://e.pypi.python.org --trusted-host e.pypi.python.org --upgrade pip # Upgrade pip