Solution Template
Try to first write a solution from scratch. But if you have difficulty, you can use the following
partial program as a starting place. Copy the following code from https://invpy.com/validatedate-
Python Programming Exercises, Gently Explained
67
template.py and paste it into your code editor. Replace the underscores with code to make a working
program:
# Import the leapyear module for its isLeapYear() function:
____ leapyear
def isValidDate(year, month, day):
# If month is outside the bounds of 1 to 12, return False:
if not (1 ____ month ____ 12):
return ____
# After this point, you can assume the month is valid.
# If the year is a leap year and the date is Feb 29th, it is valid:
if leapyear.isLeapYear(____) and ____ == 2 and ____ == 29:
return ____
# After this point, you can assume the year is not a leap year.
# Check for invalid dates in 31-day months:
if month in (1, 3, 5, 7, 8, 10, 12) and not (1 <= ____ <= 31):
return ____
# Check for invalid dates in 30-day months:
elif ____ in (4, 6, 9, 11) and not (1 <= day <= 30):
return ____
# Check for invalid dates in February:
elif month == ____ and not (1 <= ____ <= 28):
return ____
# Date passes all checks and is valid, so return True:
return ____
The complete solution for this exercise is given in Appendix A and https://invpy.com/validatedate.py.
You can view each step of this program as it runs under a debugger at https://invpy.com/validatedate-
debug/.
Further Reading
Python’s datetime module has several features for dealing with dates and calendar data. You
can learn more about it in Chapter 17 of Automate the Boring Stuff with Python at
https://automatetheboringstuff.com/2e/chapter17/.
|
