CALCUULATORRRR v0.1 (pronounced CAL COO LUH TORE) **** This is my first Python Program ever ( requires shell to function on )

Calculator.py

import sys
import math 
import time


while True:
	
	
	
		
	
	def factorial(n):
		if n == 0:
			return 1
		else:
			return n * factorial(n-1)
		
	def add(x, y):
		return x + y
  
	def subtract(x, y):
 		return x - y
   

	def divide(x, y):
		return x / y 
  
	def multiply(x, y):
		return x * y
  
	def exponent(x, y):	
  		return x ** y

	def remainder(x, y):
		return x % y
	
	def integerdiv(x, y):
		return (x - (x % y)) / y
    
	def sqrt(x):
		return x ** (1/2)
  
	def fracadd(a, b, c, d,):
		return (a * d + b * c), "/", (b * d)
  
	def fracsub(a, b, c, d,):
		return (a * d - b * c),'/',(b * d)
  
	def fracmul(a,b,c,d,):
		return (a*c),"/",(b*d)
  	
	def fracdiv(a,b,c,d):
		return (a*d),"/",(b*c)
  
	print("Select operation type.")
	print("A. basics")
	print("B. trigonometric operations")
	print("C. fractional operations")
	print("D. volume operations")
	print("E. surface area operations")
	print("F. area operation")
	
	Sop = input(" I'll do..(a/b/c/d/e/f): ")
	
	if Sop == 'a':
		print("1a.Add")
		time.sleep(.1)
		print("2a.Subtract")
		time.sleep(.1)
		print("3a.Multiply")
		time.sleep(.1)
		print("4a.Divide")
		time.sleep(.1)
		print("5a.exponent")
		time.sleep(.1)
		print("6a.integer division")
		time.sleep(.1)
		print("7a.square root")
		time.sleep(.1)
		print("8a.Factorial")
		time.sleep(.1)
		
		choice = input("choose operation (1a/2a/3a/4a/5a/6a/7a/8a): ")
		
		if choice == '1a':
			num1 = int(input("Enter first number: "))
			num2 = int(input("Enter second number: "))
			print(num1,"+",num2,"=", add(num1,num2))
			time.sleep(2)
	
		elif choice == '2a':
			num1 = int(input("Enter first number: "))
			num2 = int(input("Enter second number: "))
			print(num1,"-",num2,"=", subtract(num1,num2))
			time.sleep(2)
		
		elif choice == '3a':
			num1 = int(input("Enter first number: "))
			num2 = int(input("Enter second number: "))
			print(num1,"*",num2,"=", multiply(num1,num2))
			time.sleep(2)
		
		elif choice == '4a':
			num1 = int(input("Enter first number: "))
			num2 = int(input("Enter second number: "))
			print(num1,"/",num2,"=", divide(num1,num2))
			time.sleep(2)
		
		elif choice == '5a':
			num1 = int(input("Enter first number: "))
			num2 = int(input("Enter second number: "))
			print(num1,"^",num2,"=", exponent(num1,num2))
			time.sleep(2)
		
		elif choice == '6a':
			num1 = int(input("Enter first number: "))
			num2 = int(input("Enter second number: "))
			print(num1,"%",num2,"=", integerdiv(num1,num2))
			print( "remainder =",  remainder(num1,num2))
			time.sleep(2)

		elif choice == '7a':
			num1 = int(input("Enter first number:"))
			print("square root","=", sqrt(num1))
			time.sleep(2)
		
		elif choice == '8a':
			num1 = int(input("Enter first number:"))
			time.sleep(1.5)
			print(math.factorial(num1))
			time.sleep(2)
		
		else:
			print("invalid input")
	
		
	if Sop == 'b':
		print("1b.hypotenuse finder")
		print("1c.")
		
		choice = input("Choose operation: " )
		
		if choice == '1b':
			num1 = int(input("enter first leg: "))
			num2 = int(input("enter second leg: "))
			print(math.hypot(num1,num2))
		
		else: 
			print("not here yet")
		
			
		
		
	if Sop == 'c':
		print("1c.fractional addition")
		time.sleep(.1)
		print("2c.Fractional subtraction")
		time.sleep(.1)
		print("3c.fractional multiplication")
		time.sleep(.1)
		print("4c.fractional division")
		time.sleep(.1)
		
		choice = input("choose opration: ")
	
		
		if choice == '1c':
			num1 = int(input("Enter first numerator: "))
			num2 = int(input("Enter first denominator: "))
			num3 = int(input("Enter second numerator: "))
			num4 = int(input("Enter second denominator: "))
			print(num1,"/",num2,"+",num3,"/",num4,"=", fracadd(num1,num2,num3,num4))
			time.sleep(2)
   	
		elif choice == '2c':
			num1 = int(input("Enter first numerator: "))
			num2 = int(input("Enter first denominator: "))
			num3 = int(input("Enter second numerator: "))
			num4 = int(input("Enter second denominator: "))
			print(num1,"/",num2,"-",num3,"/",num4,"=", fracsub(num1,num2,num3,num4))
			time.sleep(2)
  
		elif choice == '3c':
			num1 = int(input("Enter first numerator: "))
			num2 = int(input("Enter first denominator: "))
			num3 = int(input("Enter second numerator: "))
			num4 = int(input("Enter second denominator: "))
			print(num1,"/",num2,"X",num3,"/",num4,"=", fracmul(num1,num2,num3,num4))
			time.sleep(2)
   
		elif choice == '4c':
			num1 = int(input("Enter first numerator: "))
			num2 = int(input("Enter first denominator: "))
			num3 = int(input("Enter second numerator: "))
			num4 = int(input("Enter second denominator: "))
			print(num1,"/",num2,"divided by",num3,"/",num4,"=", fracdiv(num1,num2,num3,num4))
			time.sleep(2)
		
		else:
			print("not there yet")
			
	if Sop == 'd':
		print("Select operation.")
		time.sleep(.1)
	
	if Sop == 'e':
		print("Select operation.")
		time.sleep(.1)
	
	if Sop == 'f':
		print("Select operation.")
		time.sleep(.1)
	
	
  

 








  else:
		print("Invalid input")