Python - Closure 함수

함수를 둘러싼 환경을 유지하고 다시 꺼내서 사용하는 함수

 

def calc():
    a = 3 
    b = 5 

    def mul_add(x):
        return a * x + b

    print(f"{locals()['a'], locals()['b'] = }")

    return(mul_add)

c = calc()
print(c(1), c(2), c(3), c(4), c(5))

 

def calc():
    a = 3 
    b = 5
    return lambda x: a * x + b 

c = calc()
print(c(1), c(2), c(3))

 

def calc():
    a = 3
    b = 5
    total = 0

    def mul_add(x):
        nonlocal total
        print(total)
        total = total + a * x + b
        print(total)

    return mul_add 
    

c = calc()

c(1)
c(2)

 

def outer():
    x = 100

    def inner(y):
        nonlocal x
        return x+y
        
    return inner

foo = outer()
foo(5)