how to make a calculator in python

                                    #You can change Text at Inputs

num1 = float(input("Enter Firt Number:"))
num2 = float(input("Enter Second Number"))

result= 0
op = str(input("Enter an op(operator)"))
#Gets Input Type--------
try:
  #U can make this in while loop ;-)
  if op=="+":
    result = num1 + num2
  else if op=="-":
    result = num1 - num2
  else if op=="*":
    result = num1 * num2
  else if op=="/":
    result = num1 / num2
  else:
      print("Invalid Input")
  print("The result is " + result)
except ZeroDivisionError:
  print("U cant do that")

                                    def add(num1, num2):
    return num1 + num2

def subtract(num1, num2):
    return num1 - num2

def multiply(num1, num2):
    return num1 * num2

def divide(num1, num2):
    return num1 / num2

                                    #My Personal Python calculator
print("My Personal Python calculator")
#inputs
num1 = int(input('Enter the first number:  '))
num2 = int(input('Enter the second number:  '))
#opration req
opr = input('Enter the type of operation you want to perform between your chosen two numbers:  ')
#calculation
if opr=='+':
    ans = num1 + num2
    # displaying the answer
    print(f'Your final answer is {ans}')
elif opr == '- ':
    ans = num1 - num2
    # displaying the answer
    print(f'Your final answer is {ans}')
elif opr=='*':
    ans = num1 * num2;
    # displaying the answer
    print(f'Your final answer is {ans}')
elif opr=='/':
    ans = num1 / num2
    # displaying the answer
    print(f'Your final answer is {ans}')
else:
    print('Invalid Entry!!!')

                                    Select operation.
1.Add
2.Subtract
3.Multiply
4.Divide
Enter choice(1/2/3/4): 3
Enter first number: 15
Enter second number: 14
15.0 * 14.0 = 210.0

                                    # This will be one of the most advanced results you will find.

# We will be using classes and simple operators like +,-,*,/

class Calculator:
  def addition(a,b):
    return a + b

  def subtraction(a,b):
    if a<b:
      return b - a
    else:
      return a - b

  def multiplication(a,b):
    return a * b

  def division(a,b):	
    if a<b:
      return b / a
    else:
      return a / b

# You can do this in terminal.
<C:/Users/username>python
>>> from main import Calculator
>>> result = Calculator.[addition|subtraction|multiplication|division](anyNumber, anyNumber)
>>> print(result)