3주차 실습-(3)

def get_number():
	return input("수를 입력하세요.\n")

def print_result(srm,res):
	print(srm,"의 제곱근은",res,"입니다.")

def isfloat(s):
	(m,_,n) = s.partition(".")
	return m.isdigit() and (n.isdigit() or n=="") or \
				 m == "" and n.isdigit()

def stop():
	cont = input('계속하시겠습니까? (y/n)')
	while not (cont == 'y' or cont == 'n'):
		cont = input('계속하시겠습니까? (y/n)')
	return cont == 'n'

def safe_sqrt():
    import math
    print("제곱근을 구해드립니다.")
    print("0이상의 수를 입력하세요.")
    while True:
        srm = get_number()
        while not isfloat(srm):
            srm = get_number()
        res = math.sqrt(float(srm))
        res = round(res,4)
        print_result(srm,res)
        if stop():
            print("안녕히 가세요.")
            break


safe_sqrt()