How to install libraries in python

How to install the library in python?

The easiest way to install third-party libraries in python

Recommended: "Python Tutorial"

1. Preparation work

(Only do the preparation work once, it will be very convenient in the future)

1. Install pip

(1) Download pip to D: \download

pip download address: https://pypi.python.org/pypi/pip#downloads

## (2) After downloading, extract to the current Directory;

(3) "win R" to enter cmd; enter the following codes in sequence:

C:\Users\Administrator>cd D:\download\pip-9.0.1
C:\Users\Administrator>d: 
D:\download\pip-9.0.1>python setup.py install

(4) Configure environment variables:

Add pip installation in PATH Path: Script folder under the python installation path

(5) Complete

Re-win R and enter cmd; run the following code directly:

Run: pip -V or pip --version to display pip version information

##2. Install wheel

(for offline installation Downloaded whl file)

"Win R" enter cmd; directly run the following code:

pip install wheel

2. Install third-party libraries

1 . Online installation

Run directly in the cmd window: pip install package name, such as pip install requests

Note: The third-party library will be automatically downloaded during installation in this way, and will not be installed after the installation is completed. Delete. If you need to delete, please go to its default download path and delete it manually;

The default path of win7: //AppData may be a hidden folder

c:\User\(your user name)\AppData\Local\pip\cache\

Default path for linux:

~/.cache/pip

In fact, there is no need to delete the cache, add - -no-cache-dir can disable caching

2. Offline installation

(1)Download

　At http://www.lfd.uci.edu/ ~gohlke/pythonlibs/ Download the .whl files for the required libraries. Note that the cp** in the file name should match the installed version. If you are installing Python2.7, you should download the corresponding cp27 .whl file

(2) Installation

Run: pip install **.whl, provided that wheel has been installed.

3. Unzip and install

Rename the .whl suffix to zip, unzip it, and put the unzipped folder into Python/Lib/site-packages.

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