How to use pip to install libraries in python

How to use pip to install libraries in python?

Several ways to use pip to install python libraries

Operating system: CentOS7.5.1804_x64

Python version: 3.6.8

Recommended : "Python Tutorial"

1. Use pip to install online

1.1 Install a single package

The format is as follows:

pip install SomePackage

Examples are as follows:

For example: pip install scipy

or specify version installation: pip install scipy==1.3.0

1.2 Install multiple packages

The example is as follows:

pip install -r req.txt

req.txt can be obtained through the following command:

pip freeze > req.txt

1.3 Other issues with online installation

1.3.1 Agent issues

If you need to install through a proxy, you can use the following format:

pip --proxy=ip:port install SomePackage

1.3.2 pip source problem

If the pip source is too slow, you can replace the pip source. There are two ways:

Method 1: Temporarily modify the pip source by modifying parameters

For example, use Alibaba Cloud's pip source:

pip install Sphinx -i http://mirrors.aliyun.com/pypi/simple/ --trusted-host mirrors.aliyun.com

Method 2: Permanently modify the pip source by modifying the configuration file

File: ~/.pip/pip.conf

For example, use Alibaba Cloud’s pip source:

[admin@localhost .pip]$ cat ~/.pip/pip.conf
[global]
index-url = http://mirrors.aliyun.com/pypi/simple/
extra-index-url=http://mirrors.aliyun.com/pypi/simple/
[install]
trusted-host = mirrors.aliyun.com
[admin@localhost .pip]$

You can also use a self-built pip source, or other public pip sources, such as :

Alibaba Cloud http://mirrors.aliyun.com/pypi/simple/

Douban (douban) http://pypi.douban.com/simple/

Tsinghua University https://pypi.tuna.tsinghua.edu.cn/simple/

University of Science and Technology of China http://pypi.mirrors.ustc.edu.cn/simple/

Windows corresponding file:

C:\Users\用户名\AppData\Roaming\pip\pip.ini

2. Install from source code

The example is as follows:

git clone https://github.com/sphinx-doc/sphinx
cd sphinx
pip install .

3. Install from whl file

The format is as follows:

pip install SomePackage.whl

Others

1. pip download offline installation package

Command example:

Download command:

pip download -d /tmp/packs -r requirement.txt -i http://mirrors.aliyun.com/pypi/simple/ --trusted-host mirrors.aliyun.com

Installation command:

pip install --no-index --find-links=/tmp/packs -r requirement.txt

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