Advanced function

　　1. Anonymous functions

def calc(x, y):
     return x+ y

func = lambda x, y: x+ y

print(calc(1, 2))
print(func(1, 2))

　　format: lambda variable: logical

　　Anonymous functions support up to ternary operations and cannot implement more complex logic

def calc(x, y):
    if x < y:
        return x+y
    else:
        return x - y


func = lambda x, y: x+y if x < y else x - y

print(calc(1, 2))
print(func(1, 2))

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　　Second, higher-order functions: accept one or more functions as parameters or return another function

 

　　3. Recursion

 

　　Fourth, the decorator