Question

this is what I’v done so far. I’m new to python. what I want to know is how to get an invalid date when a character is present in the date string. such as 01/x1/2012
also if a negative number is input for the date, to print out invalid date.
not using imports or calendars

dateStr = input("Date: ")
monthStr, dayStr, yearStr = dateStr.split("/")

months = ["January", "February","March", "April", "May", "June", "July", "August","September","October", "November","December"]
monthStr = months[int(monthStr)- 1]


print ("The date is:", monthStr, dayStr+",", yearStr)

if chr in dateStr:
    print("Invalid date")

Answer 1

These things are usually much easier done with datetime:

import datetime
date_str = input("Date: ")
try:
    date = datetime.datetime.strptime(date_str,'%m/%d/%Y')
except ValueError:
    print ("Bad date")

---

without datetime:

def parse_date(date_str):
    pieces = date_str.split('/')
    try:
        for piece in pieces:
           assert int(piece) > 0
    except (ValueError,AssertionError):
        print ("Bad Date")
    else:
        print ("Good date")

parse_date('01/x1/2010')   #Bad Date
parse_date('01/-1/2010')   #Bad Date
parse_date('01/01/2010')   #Good date