Question

Define the is_a_valid_date() function which is passed a string as a parameter. The function returns a boolean indicating whether the parameter string is a valid date or not. The first two lines of the function are: month_names = ["January", "February", "March", "April", "May", "June", "July", "August", "September", days_in_month = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31] where month_names is a list of valid month names, and days_in_month is a list which contains the maximum day number for each month (note that February is set to 28 days), e.g. the third element of the month_names list is the month of March and the corresponding third element of the days_in_month list indicates that there are 31 days in March Notes • The parameter string can contain any number of spaces but the month name must always start at the first non- space character from the beginning of the string. • The day number part of the date string to be tested could contain alphabetic characters thus making the date string invalid. You will find it useful to use the string method, isdigit(), which returns True if a string is made up of digits, False otherwise. For example: Test Result print("1.", is_a_valid_date("January 21")) 1. True print("2.", is_a_valid_date("Auust 3")) 2. False print("3.", is_a_valid_date(" June 15B ")) 3. False print("4.", is_a_valid_date("February 0")) 4. False print("5.", is_a_valid_date(" December 3K1")) 5. False print("6.", is_a_valid_date("January 28 6")) 6. False

Answer 1

1- def is_a_valid_date(a): 2 month_names = ["January", "February", "March","April", "May", "June", "July", "Augus 3 days_in_month = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31] 4 5 a = a.split() 6 if len(a) != 2: 8 return false 9 10 if a[0] not in month_names: 11 return false 12 13 if not a[1].isdigit(): 14 return false 15 16 days = days_in_month[month_names.index(a[@])] 17 given = int(a[1]) 18 19 if given < 1 or given > days: 20 return false 21 22 return True 23 24 print("1.", is_a_valid_date("January 21") 25 print("2.", is_a_valid_date("Auust 3")) 26 print("3.", is_a_valid_date(" June 158")) 27 print("4.", is_a_valid_date("February 0")) 28 print("5.", is_a_valid_date(" December 3k1")) 29 print("6.", is_a_valid_date("January 28 6")) 30

1. True 2. False 3. False 4. False 5. False 6. False

def is_a_valid_date(a):
month_names = ["January","February","March","April","May","June","July","August","September","October","November","December"]
days_in_month = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
  
a = a.split()
  
if len(a) != 2:
return False
  
if a[0] not in month_names:
return False
  
if not a[1].isdigit():
return False
  
days = days_in_month[month_names.index(a[0])]
given = int(a[1])
  
if given < 1 or given > days:
return False
  
return True
  
print("1.", is_a_valid_date("January 21"))
print("2.", is_a_valid_date("Auust 3"))
print("3.", is_a_valid_date(" June 158"))
print("4.", is_a_valid_date("February 0"))
print("5.", is_a_valid_date(" December 3k1"))
print("6.", is_a_valid_date("January 28 6"))
  

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