binomial.py

def displayMenu():
    print('\n\n Main menu of calculator:')
    print('1) add to numbers')
    print('2) substract to numbers')
    print('3) multiply to numbers')
    print('4) divide to numbers')
    print('5) potentize to numbers')
    print('6) exit program')
    print('7) factorial')
    print('8) binomial coefficient')
def getNumbers():
    action = int(input('Choose your option (1-8): '))
    number1 = float(int(input('Type the first number: ')))
    if action == 7:
        number2 = 0
    else:
        number2 = float(int(input('Type the second number: ')))
    return action, number1, number2
def add(number1,number2):
    return number1+number2
def sub(number1,number2):
    return number1-number2
def mult(number1,number2):
    return number1*number2
def div(number1,number2):
    return number1/number2
def power(number1,number2):
    return number1**number2
def factorial(n):
    f = 1
    i = 0
    while i < n:
        i += 1
        f = f * i
    return f
def binomial(x, y):
    if y == x:
        return(1)
    elif y == 1:
        return(x)
    elif y > x:
        return(0)
    else:
        a = factorial(x)
        b = factorial(y)
        c = factorial(x-y)
        div = a // (b * c)
        return div

def displayResult(action, number1, number2):
    result = 0
    if action == 1:
        result = add(number1, number2)
    if action == 2:
        result = sub(number1, number2)
    if action == 3:
        result = mult(number1, number2)
    if action == 4:
        result = div(number1, number2)
    if action == 5:
        result = power(number1, number2)
    if action == 6:
        exit(0)
    if action == 7:
        result = factorial(number1)
    if action == 8:
        result = binomial(number1, number2)

    print(round(result, 1))

while True:
    displayMenu()
    action, number1, number2 = getNumbers()
    displayResult(action, number1, number2)
    answer = input('Do another calculation ("yes" or "y"; other to quit program)? ')
    if (answer.lower() != 'yes' and answer.lower() != 'y'):
        exit(0)