A year in the modern Gregorian Calendar consists of 365 days. In reality, the earth takes longer to rotate around the sun. To account for the difference in time, every 4 years, a leap year takes place. A leap year is when a year has 366 days: An extra day, February 29th. The requirements for a given year to be a leap year are: 1) The year must be divisible by 4 2) If the year is a century year (1700, 1800, etc.), the year must be evenly divisible by 400 Some example leap years are 1600, 1712, and 2016. Write a program that takes in a year and determines whether that year is a leap year. Ex: If the input is: 1712 output: 1712 is a leap year.  input: 1913 output: 1913 is not a leap year. Your program must define and call the following function. The function should return true if the input year is a leap year and false otherwise. def is_leap_year(user_year) My Code: def is_leap_year(user_year): if((user_year % 4 == 0 and user_year % 100 != 0) or (user_year % 400 == 0)): print("{} is a leap year.".format(user_year)) else: print("{} is not a leap year.".format(user_year)) if __name__ == '__main__': user_year = int(input()) print(is_leap_year(user_year)) My output: 1712 is a leap year. None I dont know why the 'none' is being put out and for some reason it wont compute the other input values.