Simple notation for functions

Writing rules for functions:

def function name (parameter):
...
function body
...
return value

The definition of a function has the following main points:

• def: A keyword that represents a function
• Function name: the names of functions, which are called in the future according to the function name (similar to a variable)
• function Body: The function of a series of logical calculations, such as: The received data must be a number, to find the maximum value, etc...
• Parameters: Providing data for the function body (providing one or more variables to the function)
• Return value: Once the function has finished executing, it can return data to the caller.

1. Return value

A function is a function block, and the result of the execution of the function is to inform the caller by the return value

2. Parameters

# no parameters
def test1 ():
    Print (123)
Test1 ()

# Default Parameters
def test1 (w= ' day1 '):
    Print (W)
Test1 ()
# General Parameters
def test2 (W):
    Print (W)
Test2 (2)
# Specify parameters
def test3 (w,e):
    Print (w,e)
Test3 (e=2,w=1)

# any number of parameters
def test4 (*args):
    Print (args)
Test4 (1,2,3,4,5,6)

# character Typical parameters
def test5 (**kwargs):
    Print (Kwargs)
Test5 (name= ' Jack ', sex= ' nan ')

Simple notation for functions