"Python" Learning Note 12: Modules

Modules (module)

In Python, a. py file is a module. Through the module, you can invoke programs in other files

Introducing Modules

Write a first.py file that reads as follows:

def Letter ():    print(' ABC ')

Write a second.py file that reads as follows:

Import firstfor i in Range (    ): First.letter ()

In the second.py file, we used the letter () function defined in first.py.

Once the module is introduced, we can invoke an object in the module by means of the module. Object

How to introduce modules in Python

Import a as B # introduces module a renamed to B

From a import function1 # A Function1 object is introduced from module A, and when you call an object in a, we don't use the a.function1 directly with Function1.

From a import * #调用时直接使用对象 instead of a. Object

The following three formulations are the same

Notation 1

import first as Afor i in range:    a.letter ()

Notation 2

Import letterfor i in range (+): Letter    ()

Notation 3

Import *for i in range (+): Letter    ()

Module Package

We can put files of similar function in a folder (for example: Exp_dir), constitute a module package, through

import exp_dir.module

Introduce module modules in the This_dir folder.

The folder must contain a __init__.py file that reminds Python that the folder is a module package. __init__.py can be an empty file.

"Python" Learning Note 12: Modules