ValidMonth.py

import string
# -----------
# User Instructions
#
# Modify the valid_month() function to verify
# whether the data a user enters is a valid
# month. If the passed in parameter 'month'
# is not a valid month, return None.
# If 'month' is a valid month, then return
# the name of the month with the first letter
# capitalized.
#

months = ['January',
          'February',
          'March',
          'April',
          'May',
          'June',
          'July',
          'August',
          'September',
          'October',
          'November',
          'December']

def valid_month(month):
    month = month.lower()
    month = string.capwords(month)

    if month in months:
        return month
    else:
        return None

# valid_month("january") => "January"
# valid_month("January") => "January"
# valid_month("foo") => None
# valid_month("") => None

print valid_month("may")