What tools are commonly used to install extension libraries in Python?

pip is a Python package management tool that provides the functions of finding, downloading, installing, and uninstalling Python packages.

Currently, if you download the latest version of the installation package from python.org, it already comes with this tool.

Python 2.7.9 or Python 3.4 or above comes with the pip tool.

pip official website: https://pypi.org/project/pip/

You can use the following command to determine whether it has been installed:

pip --version

If you have not installed it yet , you can use the following method to install:

$ curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py   # 下载安装脚本
$ sudo python get-pip.py    # 运行安装脚本

Note: Which version of Python is used to run the installation script, pip will be associated with that version. If it is Python3, execute the following command:

$ sudo python3 get-pip.py    # 运行安装脚本。

Generally, pip corresponds to Python 2.7, and pip3 corresponds to Python 3.x.

Some Linux distributions can directly use the package manager to install pip, such as Debian and Ubuntu:

sudo apt-get install python-pip

pip’s most commonly used commands

Show version and path

pip --version

Get help

pip --help

Upgrade pip

pip install -U pip

If there is a problem with this upgrade command, you can use the following command:

sudo easy_install --upgrade pip

Installation package

pip install SomePackage          # 最新版本
pip install SomePackage==1.0.4      # 指定版本
pip install 'SomePackage>=1.0.4'     # 最小版本

For example, I want to install Django. Just use the following command, which is convenient and quick.

pip install Django==1.7

Upgrade package

pip install --upgrade SomePackage

Upgrade the specified package by using ==, >=, <=, >, < to specify a version number .

Uninstall package

pip uninstall SomePackage

Search package

pip search SomePackage

Display installation package information

pip show

View detailed information of the specified package

pip show -f SomePackage

List installed packages

pip list

View upgradeable Package

pip list -o

Notes

If Python2 and Python3 have pip at the same time, the usage method is as follows:

Python2:

python2 -m pip install XXX

Python3:

python3 -m pip install XXX

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