Python Basic introduction （ A full set of nanny level tutorials ）

The third chapter

The fourth quarter, ： Shape parameter

Shape parameter
Positional arguments
At the time of function definition . Some variables need to be prepared to receive information

def luru(name, age, gender=" male "):
    print(name, age, gender)


luru(" Zhang San ", 18)
luru(" Li Si ", 28)
luru(" Wang two pock marks ", 38)
luru(" Wu Laoer ", 14)
luru(" Zhao Min ", 12, " Woman ")
luru(" Zhou Zhiruo ", 11, " Woman ")

Dynamic transfer parameters

def chi(*food):  # *  Represents the dynamic transfer of position parameters , * The received values will be uniformly placed in a tuple 
    print(food)


chi(' Rice ', " Braised eggplant ", ' Seaweed and Egg Soup ', " Haagen-Dazs ")
chi(" Rice ")
chi(" Rice ", " Braised eggplant ")
chi(" Rice ", " Seaweed and Egg Soup ")
chi(" Rice ", " Seaweed and Egg Soup ", " Seaweed and Egg Soup ")

Dynamic parameters of keywords

def chi(**food):  # **  Indicates the dynamic parameter transmission of the received keyword ,  All parameters received will be processed into a dictionary 
    print(food)


chi(fu=" Muxu persimmon ", zhu=" Little rice ")

Receive any parameters without restrictions

def func(*args, **kwargs):  #  Receive any parameters without restrictions 
    print(args, kwargs)

func()  # (), {}
func(1) # (1, ), {}
func(1,2,3,4,4, a=2)  # (1,2,3,4,4), {"a":2}
func(1,2,3,4, c=4, a=2)# (1,2,3,4), {"c":4, "a":2}

summary ：

1. Shape parameter , At the time of function definition . Some variables need to be prepared to receive information
   1. Positional arguments , Declare variables one by one according to position
   2. Default parameter , Give the variable a default value when the function is declared , If the argument does not pass information . At this time, the default value takes effect , Otherwise, it will not take effect
   3. Dynamic transfer parameters .
   1. *args, Indicates the dynamic transmission of all position parameters
   2. **kwargs, It means to receive dynamic parameters of all keywords

    The order *:  Location  > *args >  The default value is  > **kwargs