Modules and Module Files

Python Tutorials - Herong's Tutorial Examples

∟Modules and Module Files

This chapter provides introductions and tutorial examples about on modules and module files. Topics include introduction of 'module' objects and module files; importing module files to create modules; reloading modules; accessing module members; importing module members only.

What Is Module

"import module" - Two-Step Process

sys.modules - Listing Loaded Modules

importlib.reload(module) - Reloading Module

What Are Module Members

"from module import member" Statement

"from module import *" Statement

What Is __all__ List

__pycache__/module.version.pyc Files

What Is the __main__ Module

Takeaways:

A module is an object of the "module" data type that can store attributes, functions, class classes.
There is no Python statement you can use to create "module" object.
"module" objects are created from module files by running "import" statements.
A module file, module_name.py, contains Python code to define module members: attributes (variables), functions, and classes.
"import module_name" statement loads a module file into memory and binds it module_name as a local variable.
"import module_name as variable_name" statement loads a module file into memory and binds it variable_name as a local variable.
"from module_name import member_name" statement loads a module file into memory and binds the given member to member_name as a local variable.
"from module_name import *" statement loads a module file into memory and binds each member to member_name as a local variable.
The __main__ module is created by the Python system as the first module to start executing user specified Python code.