Chapter VII basis, function 02

Chapter VII basis, function 02

First, the definition of the function

Definition: In the program, function like a feature tool, the tool is ready to define a function, encounter scenarios that make use of the calling function

Second, why use the function

To solve the following three questions:

1. Redundancy program

2. Bearded expansion poor

3. Poor readability of the program

Third, how to use the function

Define, after calling

• Defined Functions

  def 函数名(param1、param2……):
      """
      函数功能的描述信息
      :param1：描述
      :param2：描述
      :return：返回值
      """
      code 1
      code 2
      code 3
      ...
  
      return 返回值
  调用函数

  函数名(param1、param2……)

• Function definition stage

  def func():
      bar()  # 不属于语法错误，不会报错
      print('*'*10)

• Function call stage

  def bar():
      print('from bar')
  
  def foo():
      print('from foo')
      bar()
  
  foo()
  '''
  from foo
  from bar
  '''

  def foo():
      print('from foo')
      bar()
  
  def bar():
      print('from bar')
  
  foo()
  '''
  from foo
  from bar
  '''