Assignment $1$ contained the qualifier: "There are some Python modules that can do this kind of calculation for you. You are expected to do the calculation yourself for this assignment, without help from imported modules."

How easy was the assignment without this restriction? Let's repeat it in a$1.$py$.$

Use the datetime.datetime.strptime function, to create a datetime object. Hint: $"\%$Y$/\%$m$/\%$d$".$

Instances of datetime have a $.$timetuple$()$ method. It returns a "struct$\_$time" object, and a struct$\_$time has a tm$\_$yday attribute representing the day of year.

Use these facts to solve assignment $1$ in a few lines of code. A leap year example:

Enter a date in the form YYYY$/$MM$/$DD: $2024/05/03$

$2024/05/03$ is day $124$ of the year $2024.$

A non$-$leap year:

Enter a date in the form YYYY$/$MM$/$DD: $2023/05/03$

$2023/05/03$ is day $123$ of the year $2023.$

If strptime is given an invalid date it will raise a ValueError. Use that to handle invalid inputs.

Enter a date in the form YYYY$/$MM$/$DD: tomorrow

Invalid date.