noob in need of guidance for calendar (days of month)

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Views: 1501 | Replies: 11

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Join Date: Oct 2004

Posts: 2,529

Reputation: vegaseat will become famous soon enough

Rep Power: 11

Solved Threads: 178

vegaseat

Offline

DaniWeb's Hypocrite

Re: noob in need of guidance for calendar (days of month)

#11

Oct 9th, 2007

You don't have to exit the program, just stay in a loop until conditions are met ...

 Help with Code Tags 
 python Syntax (Toggle Plain Text) 
while True:
    date = raw_input("Enter a date in the form YYYY/MM/DD:")
    # slice the string and convert to integer values
    year = int(date[0:4])
    month = int(date[5:7])
    day = int(date[8:10])
    if month in range(1, 13):
        # ok, break out of the while loop
        break
    else:
        # stay in the while loop
        print "month should be between 01 and 12"
 
# test
print year, month, day
while True:
    date = raw_input("Enter a date in the form YYYY/MM/DD:")
    # slice the string and convert to integer values
    year = int(date[0:4])
    month = int(date[5:7])
    day = int(date[8:10])
    if month in range(1, 13):
        # ok, break out of the while loop
        break
    else:
        # stay in the while loop
        print "month should be between 01 and 12"
 
# test
print year, month, day

Things get hairy with correct days.

If you want to exit a program, this line of code will do ...

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(Toggle Plain Text)

raise SystemExit

Last edited by vegaseat : Oct 9th, 2007 at 1:35 am.

May 'the Google' be with you!

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Join Date: Jul 2006

Posts: 562

Reputation: jrcagle is on a distinguished road

Rep Power: 4

Solved Threads: 72

jrcagle

Offline

Posting Pro

Re: noob in need of guidance for calendar (days of month)

#12

Oct 9th, 2007

Validating input is one of my big themes with my students. It's usually accomplished like this:

 Help with Code Tags 
 Python Syntax (Toggle Plain Text) 
(note no 'inlinecode' tags)
 
while True:
   inp = raw_input("prompt: ")
   if inp_is_valid:
      process_inp
      break
   else:
      print "Helpful Error Message"
...
(note no 'inlinecode' tags)

while True:
   inp = raw_input("prompt: ")
   if inp_is_valid:
      process_inp
      break
   else:
      print "Helpful Error Message"
...

That's the usual framework, then you can fill in the details.

Once you've learned functions, you can throw all the validation into a function.

Hope it helps,
Jeff

Last edited by jrcagle : Oct 9th, 2007 at 9:36 pm.