Python's modules and packages

First, the module

We've learned a lot of modules before, and today we'll take a look at how they're used.

1.import

First, customize a module my_moudle.py, that is, the file name is My_moudle

Print('From the my_moudle.py') Money=1000defread1 ():Print('My_moudle->read1->money', Money)defread2 ():Print('My_moudle->read2 calling Read1') Read1 ()defChange ():Global Money Money=0

My_moudle Module

Import statements can be used anywhere in the program, and for the same module is import multiple times, in order to prevent you to repeat the import, Python optimization means: The first import after the module name loaded into memory, Subsequent import statements only add a reference to a Module object that has already loaded large memory, and the statements within the module are not re-executed. As shown below:

Python's modules and packages