python - Why is it keep on asking when I input correctly? -

def main():   month = 0  date = 0  year = 0  date = [month, date, year]  user = input("enter according mm/dd/yy:")  user = user.split('/')  month = user[0]  date = user[1]  year = user[2]  while int(month) > 12  or int(month) < 1 :     print("month incorrect.")     user = input("enter according mm/dd/yy:")  while int(date) > 31 or int(date) < 0:     print("date incorrect.")     user = input("enter according mm/dd/yy:")  while int(year) > 15 or int(year) < 15:     print("year incorrect.")     user = input("enter according mm/dd/yy:") 

i keep on getting month incorrect when it's correct. please help. i'm trying user's input match correct form of mm/dd/yy. , i'm trying convert yy -> 2015. please help.

there bug in code. suppose if input "15/30/15", says incorrect month , tries fetch user input in format "mm/dd/yy", user not spliting based on '\', while loop keeps running till user[0] assigned new month. error occurs incorrect date , year well. fix call user input function , split user inside while loop itself.