4  Functions

4.0.0.1 Sqrt 사용자 정의 함수 실습

def mySqrt (n):
    old=0
    new=n/2
    while abs(old-new)>1e-10 :
        old=new
        new=1/2*(old+n/old)
    return new

mySqrt(3)

1.7320508075688772

list_int=[1,2,3,4,5,6,7,8]
list_str=["1","2","3","4","5","6","7","8"]

list(filter(lambda x:x,list_str))

['1', '2', '3', '4', '5', '6', '7', '8']

list(filter(lambda x:x+"1",list_str))

['1', '2', '3', '4', '5', '6', '7', '8']

bool("2")

True

list(filter(lambda x:x,list_int))

[]

list(filter(lambda x:bool(x-1),list_x))

[2, 3, 4]

filter(lambda x:x-1,list_int)

<filter at 0x1f5d235af10>