pip

# Install a package (see `pip install` for more install examples):
$  pip install package_name

# Install a package to the user's directory instead of the system-wide default location:
$ pip install --user package

# Upgrade a package:
$ pip install --upgrade package_name

# Uninstall a package:
$ pip uninstall package_name

# Save installed packages to file:
$ pip freeze > requirements.txt

# Show installed package info:
$ pip show package_name

# Install packages from a file:
$ pip install --requirement requirements.txt

$ python -m pip --version
$ python -m pip install --upgrade pip

$ python -m pip config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple
Writing to /Users/james/.config/pip/pip.conf
$ python -m pip config get global.index-url

# 临时使用清华大学镜像源
$ python -m pip install -i https://pypi.tuna.tsinghua.edu.cn/simple --upgrade pip