leap_year_calculator.py

#!/usr/bin/env python3

year = int(input("Which year do you want to check? "))

if year%4 == 0:
  if year%100 == 0:
    if year%400 == 0:
      print("Leap year.")
    else:
      print("Not leap year.")
  else:
    print("Leap year.")
else:
  print("Not leap year.")