Date format and past date check function

[deanhystad]

You can shorten it up a bit more. There's no need for the "present" variable of the final "else". It is also a good idea to provide guidance on what is the proper date format.

from datetime import datetime

def enter_date(prompt, valid):
    '''Enter date string.  Return reformatted datestring and flag indicating if date is in the past'''
    while True:
        date = input('Provide date (m/d/yyyy): ')
        try:
            date = datetime.strptime(date, '%m/%d/%Y')
        except ValueError:
            print("Incorrect date format, please enter a proper date.")
        else:
            if date.date() >= datetime.now().date():
                return date.strftime('%m/%d/%Y')
            print("Date must not be in the past.")
 
 
print(enter_date())