如何计算整数的小数位数？

def calculate_decimal_places(integer):
    float_num = float(integer)
    str_num = str(float_num)
    decimal_point_index = str_num.index('.')
    decimal_places = len(str_num) - decimal_point_index - 1
    return decimal_places

integer = 10
decimal_places = calculate_decimal_places(integer)
print("整数 {} 的小数位数为 {}".format(integer, decimal_places))