Python 4.3.1.8 LAB: Day of the year: writing and using your own functions

 Day of the year: writing and using your own functions

Day of the year: writing and using your own functions

Prerequisites

LAB 4.3.1.6

LAB 4.3.1.7

Objectives

Familiarize the student with:

• projecting and writing parameterized functions;
• utilizing the return statement;
• building a set of utility functions;
• utilizing the student's own functions.

Scenario

Your task is to write and test a function which takes three arguments (a year, a month, and a day of the month) and returns the corresponding day of the year, or returns None if any of the arguments is invalid.

Use the previously written and tested functions. Add some test cases to the code. This test is only a beginning.

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Solution Code:

def is_leap_year(year): # LAB 4.3.1.6 A leap year

    if year % 4 != 0:

        return False

    elif year % 100 != 0:

        return True

    elif year % 400 != 0:

        return False

    else:

        return True

def days_in_month(year, month): #LAB 4.3.1.7 How many days

    if year < 1 or month < 1 or month > 12:

        return None

    days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]

    res  = days[month - 1]

    if month == 2 and is_leap_year(year):

        res = 29

    return res

def day_of_year(year, month, day): #LAB 4.3.1.8 Day of the year

    days = 0

    for m in range(1, month):

        md = days_in_month(year, m)

        if md == None:

            return None

        days += md

    md = days_in_month(year, month)

    if day >= 1 and day <= md:

        return days + day

    else:

        return None

print(is_leap_year(1900))

print(days_in_month(2021, 11))

print(day_of_year(2000,2,29))

Output:

• False
• 30
• 60

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