#! /Usr/bin/env python and #! /Usr/bin/python,

#! /Usr/bin/env python and #! /Usr/bin/python,

The first line of the script language is to point out what executable programs you want to use to run the code in your file.

#! /Usr/bin/python indicates that the python interpreter under/usr/bin is called when the operating system executes the script;
#! /Usr/bin/env python is used to prevent operating system users from installing python in the default/usr/bin path. When the system sees this line, it first searches for the python installation path in the env settings, and then calls the interpreter program in the corresponding path to complete the operation.
#! /Usr/bin/python is equivalent to writing the python path;
#! /Usr/bin/env python will go to the environment settings to find the python directory,This writing method is recommended.