Exercise on www.practicepython.org

character_input

from time import strftime

now = int(strftime("%Y"))
name = input("What is your name?\n->")
years = list(range(100))

while True:
    try:
        age = int(input("How old are you?\n->"))
        if age not in years:
            raise ValueError
        break
    except ValueError:
        print("Please, write a natural number less 100.")
        continue

while True:
    try:
        times = int(input("How many times print the answer?\n->"))
        break
    except ValueError:
        times = 1
        print("Your input is not understandable. Set to 1.")
        break

left = 100 - age
year100 = now + left

print(times * "{0}, you will be 100 years old in {1}. {2} years left.\n".format(name, year100, left))