It is python. I almost finished the code but I have an error. I have included all the tasks for each function even though it is done and working. I commented on where I need help fixing errors, It says,"NEED HELP HERE". The problem is with the last function, day_of_year()

Scenario # first function scenario. Your task is to write and test a function which takes one argument (a year) and returns True if the year is a leap year, or False otherwise. Note: we've also prepared a short testing code, which you can use to test your function. The code uses two lists - one with the test data, and the other containing the expected results. The code will tell you if any of your results are invalid. Scenario # second function scenerio Your task is to write and test a function which takes two arguments (a year and a month) and returns the number of days for the given month/year pair (while only February is sensitive to the year value, your function should be universal).

Scenario # third scenerio function. 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.

#Entire code

def is_year_leap(year): #first fucntion

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): #second function

if month in [1, 3, 5, 7, 8, 10, 12]:

return 31

elif month in [4, 6, 9, 11]:

return 30

elif month == 2:

if is_year_leap(year):

return 29

else:

return 28

else:

return None

test_years = [1900, 2000, 2016, 1987]

test_months = [2, 2, 1, 11]

test_results = [28, 29, 31, 30]

for i in range(len(test_years)):

yr = test_years[i]

mo = test_months[i]

print(yr, mo, "->", end="")

result = days_in_month(yr, mo)

if result == test_results[i]:

print("OK")

else:

print("Failed")

def day_of_year(year, month, day): #Third function. NEED HELP HERE

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(day_of_year(2000, 12, 31))