Need help in finding the day of given (year,month,date) in python

Question

def isYearLeap(year):   # Leap year formula

    if year % 4 == 0 and year % 100 != 0 :     
        return True 
    elif year % 400 == 0 :
        return True
    else :
        return False
    
            
testData = [1900, 2000, 2016, 1987]         # Test Data as reference

testResults = [False, True, True, False]

for i in range(len(testData)):

    yr = testData[i]
    print(yr,"->",end="")
    result = isYearLeap(yr)
    if result == testResults[i]:
        print("OK")
    else:
        print("Failed")

def daysInMonth(year, month): # Finding out days in months in common & leap year

    days = 0
    mo31 = [1,3,7,5,8,10,12]
    if year % 4 == 0 :              
        days = 1
        if year % 100 == 0 :
            days = 0
        if year % 400 == 0 :
            days = 1
    if month == 2 :
        return 28 + days
    if month in mo31 :
        return 31
    return 30

testYears = [1900, 2000, 2016, 1987] # Test Data as reference 

testMonths = [2, 2, 1, 11]
testResults = [28, 29, 31, 30]

for i in range(len(testYears)):

    yr = testYears[i]
    mo = testMonths[i]
    print(yr, mo, "->", end="")
    result = daysInMonth(yr, mo)
    if result == testResults[i]:
        print("OK")
    else:
        print("Failed")
        
def dayOfYear(year, month, day):

    doy = ["Sat","Sun","Mon","Tue","Wed","Thu","Fri"] # Days of week
    monthvalue = [1,4,4,0,2,5,0,3,6,1,4,6]        # Months value zellers rule
    century = [1700,1800,1900,2000]      # Zellers rule 
    value = [4,2,0,6]   # Zellers rule
    rem = 0     # Remainder Variable
    r = []      # Empty List to compare remainder and to a doy
    y = str(year)   # Converting year into string
    y = int(y[2:4]) # Taking last two digits of string & if used return the function ends 
    y = int(year)   # here returning last two digits 
    m = int(month)
    d = int(day)
    mo = [] # Empty list for comparing month with monthly values
    dd = 0   
    if dd == 0 :
        for i in range(len(monthvalue)) :
            mo.append(i)    # Creating mo list
            if m in mo:
                mo[i] == monthvalue[i]
        dd = y // 4 + d + m 
    if m >= 2 :                  
            dd -= 1
            dd += y
    for i in range(len(value)) :
        if y in century :
            y = century[i] == value[i]
            dd += y
            
    rem = dd % 7
    for i in range(len(doy)) :
        r.append(i) # Creating r list
        if rem in r :
            rem = r[i] == doy[i]
    print(rem)
        
    
        
print(dayOfYear(2000, 12, 31)) # Giving output False  "\n None

Answer 1

I recognize this as a lab in the netacad cisco python course. You were tasked with creating an is_year_leap() function in LAB 4.3.1.6, a days_in_month() function in LAB 4.3.1.7, and a day_of_year() function in LAB 4.3.1.8. The functions have one, two, three parameters respectively. Please see below code. Note that I excluded a code to return None if any of the arguments are invalid. I would like you to add that on your own as learning.

# from LAB 4.3.1.6
def is_year_leap(year):
    if year % 4 == 0:  # leap year occur every 4 years & is divisible by 4
        return True
    else:
        return False


# from LAB 4.3.1.7
def days_in_month(year, month):
    # Create list with month days for each month as advised in the LAB
    month_days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
    if is_year_leap(year):
        month_days[1] = 29  # 29 days for February on a leap year.
    return month_days[month - 1]  # month 1 corresponds with index 0 & so on.


# for LAB 4.3.1.8
def day_of_year(year, month, day):
    total = 0  # initializing the total variable to add results
    # create loop to add only days in the months before the month in the input/test data
    for i in range(1, month):
        result = days_in_month(year, i)
        total += result
    day_num = total + day  # add the value of the day argument to get day of the year
    return day_num


# test data
print(day_of_year(2000, 12, 31))
print(day_of_year(1999, 12, 31))
print(day_of_year(2021, 7, 29))

Answer 2

A point to note is the occurrence of days above the number of days of months.

def is_year_leap(year):
    return year % 4 == 0 and not year % 100 == 0 or year % 400 == 0


def days_in_month(year, month):
    days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
    if is_year_leap(year):
        days[1] = 29
    return days[month - 1]


def day_of_year(year, month, day):
    if day <= days_in_month(year, month):
        count = 0
        for yr in range(1, month):
            count += days_in_month(year, yr)
        return count + day

Answer 3

The leap year should fulfil all its conditions for getting the day of the year.

• if the year is divisible by 400 then is_leap_year,
• else if the year is divisible by 100 then not_leap_year
• else if the year is divisible by 4 then is_leap_year
• else not_leap_year

The number of days should also be checked whether it exceeds the day in the month.

#Check for leap year
def is_year_leap(year):
    if year%400==0 or (year%100 != 0 and year%4==0):
        return True
    else:
        return False

#Check for number of days in month
def days_in_month(year, month):
    month31=[1,3,5,7,8,10,12]
    if month in month31:
        return 31
    elif(month == 2):
        if(is_year_leap(year)):
            return 29
        else:
            return 28
    else:
        return 30


#Check for corresponding day of the year
def day_of_year(year, month, day):
    total = 0
    if day <= days_in_month(year, month):
        total = day
        for i in range(month-1):
            total += days_in_month(year, i)
        return total
    else:
        return "Your month doesn't have that many days."


print(day_of_year(2000, 12, 31))
print(day_of_year(2001, 12, 31))
print(day_of_year(2008, 12, 31))
print(day_of_year(2000, 11, 31))