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Python - Mortgage EMI Calculator

🐍 Using Python, write a program to calculate the monthly payments of a mortgage at a given interest rate. Also figure out how long it will take the user to pay back the loan. For added complexity, add an option for users to select the compounding interval (Yearly, Bi-Yearly, Quarterly, Monthly, Weekly, Daily)

Solution

def emicalculator(loan, interest, interval, emi):

    day_count = 0
    remaining = loan
    if interval[0].lower()=='d':
        while remaining > 0:
            day_count += 1
            remaining += (interest/100)*remaining
            if day_count%30==0:
                remaining -= emi
                if remaining>=loan:
                    print('Either lower interest rate or increase EMI')
                    break
    
    elif interval[0].lower()=='w':
        while remaining > 0:
            day_count += 1
            if day_count%7==0:
                remaining += (interest/100)*remaining
            if day_count%30==0:
                remaining -= emi
                if remaining>=loan:
                    print('Either lower interest rate or increase EMI')
                    break
    elif interval[0].lower()=='m':
        while remaining > 0:
            day_count += 1
            if day_count%30==0:
                remaining += (interest/100)*remaining
                remaining -= emi
                if remaining>=loan:
                    print('Either lower interest rate or increase EMI')
                    break
    elif interval[0].lower()=='q':
        while remaining > 0:
            day_count += 1
            if day_count%90==0:
                remaining += (interest/100)*remaining
            if day_count%30==0:
                remaining -= emi
                if remaining>=loan:
                    print('Either lower interest rate or increase EMI')
                    break
        print(f'Number of days required to return loan amount: {day_count}')
    elif interval[0].lower()=='b':
        while remaining > 0:
            day_count += 1
            if day_count%180==0:
                remaining += (interest/100)*remaining
            if day_count%30==0:
                remaining -= emi
                if remaining>=loan:
                    print('Either lower interest rate or increase EMI')
                    break
    elif interval[0].lower()=='y':
        while remaining > 0:
            day_count += 1
            if day_count%360==0:
                remaining += (interest/100)*remaining
            if day_count%30==0:
                remaining -= emi
                if remaining>=loan:
                    print('Either lower interest rate or increase EMI')
                    break
    else:
        print('Incorrect interval chosen.')
    if remaining<=0:
        return day_count
    else:
        mainfunc()

def mainfunc():
    loan = float(input("Enter Loan Amount: "))
    interest = float(input("Enter Interest Percentage: "))
    interval = input("Enter Interest Interval (daily, weekly, monthly, quarterly, bi-yearly, yearly): ")
    emi = float(input("Enter EMI: "))
    print(emicalculator(loan, interest, interval, emi))
    
if __name__=='__main__':
    mainfunc()
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