Python: Understanding Modules

First, understand the Python module :

　　-- What is a function:

A function is a program that implements one or more functions

A module is a program block that implements a class of functions, a script file that contains functions and other statements, with a suffix of ". Py"

By default, the module is stored in c:/python27/lib

-- How to import the module: using import

　　　　

We want to be able to show the value of pi directly, but no.

　　

　　　　Now, import the corresponding module name using import, we can get the value of pi 　　

-- Understanding the sys module

SYS module: modules related to system functions

　　

Sys.version--View version information

Sys.executable--The file name that the parser can perform

Sys.getwindowsversion ()--Version information

Second,"*. PYc file": Apython parser-generated binary file after the module is compiled

three,F orm ... import ...

1. Import Module Name: Imports the corresponding module (see one )

2.from. Import function name (function, attribute, etc.): one of the functions that the import module corresponds to

3.from. Import *: Import all functions of the module

　　

　　

　　

Iv. Understanding __name__ Properties : can be used to determine whether the other modules are called

　　

　　

Is the result of running test.py directly (self-invocation)

　　

Is the result of running call.py directly (other module calls)

Five. Custom Module : Non-system comes with the module

　　　　

The Python version used in this article is 2.7.10and the tool is pycharm

Python: Understanding Modules