Detailed explanation of the usage of def in Python and what is def

1. def is a defining function

Syntax: def function name (parameter 1, parameter 2,......, parameter n):
Function body
return statement (return a certain value)

Give an example

def hello(name):
	print(name+"How are you")
	return 

2. Def can be used as a calling function: enter the value corresponding to the function name and parameter.

def hello(name):
	print(name+"How are you")
	return 

hello("baby")#Call the def parameter

3. Def can also be used as a parameter

1. Position parameters

def menu(appetizer,course):
	print("A serving of fruit:"+appetizer)
	print("A small noodles"+course)
menu("watermelon","Chongqing small noodles")

The "watermelon" and "small face" here are passed in the position order of corresponding parameters appetizer and course, so they are called position parameters, which is also the most common parameter type.

Appendix: Why do we need the def function

In some programs, we use duplicate part of the code in many places, just like the following piece of code:

a = 1
b = 2
c = a + b
d = a + b
e = a + b

The above code has been reused many timesa + bIt's very troublesome to usedefAfter the function, everything becomes simple:

def sum(num1,num2) :
    n =  num1 + num2
    return n
a = 1
b = 2
c = num(a,b)

At this time, the value of c is still 3

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