The difference between classes and functions in python

Class (Class): Used to describe a collection of objects with the same properties and methods. It defines the properties and methods common to every object in the collection. Objects are instances of classes.

Create a class

Use the class statement to create a new class, class is followed by the name of the class and ends with a colon:

class ClassName:
   '类的帮助信息'   #类文档字符串
   class_suite  #类体

Functions are organized and can be reused , a code segment used to implement a single or related function.

Function can improve the modularity of the application and the reuse rate of the code. You already know that Python provides many built-in functions, such as print(). But you can also create your own functions, which are called user-defined functions.

Custom function

def functionname( parameters ):   "函数_文档字符串"
   function_suite
   return [expression]

Rules for defining functions

The function code block starts with the def keyword, followed by the function identifier name and parentheses ().

Any incoming parameters and independent variables must be placed between parentheses. Parameters can be defined between parentheses.

The first line of a function can optionally use a documentation string - used to store function descriptions.

The function content starts with a colon and is indented.

return [expression] Ends the function and optionally returns a value to the caller. Return without an expression is equivalent to returning None.

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