Programming a Calculator using Python.py

#TODO: Write the functions for arithmatic operations here
#These functions should cover Task 2
def add(a, b):
    return a + b

def subtract(a, b):
    return a - b

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

def divide(a, b):
    try:
        return a / b
    except Exception as e:
        print(e)
        return None

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

def remainder(a, b):
    try:
        return a % b
    except Exception as e:
        print(e)
        return None


#-------------------------------------
#TODO: Write the select_op(choice) function here
#This function sould cover Task 1 (Section 2) and Task 3
def select_op(choice):

    # terminate
    if choice == "#":
        return -1
        
    # reset
    if choice == "$":
        return 0

    # valid arithmetic operators
    if choice not in ['+','-','*','/','^','%']:
        print("Unrecognized operation")
        return 0

    # ----- INPUT FIRST NUMBER -----
    while True:
        num1 = input("Enter first number: ")
        print(num1)
        if num1 == "$":
            return 0
        if num1 == "#":
            return -1
        if num1.endswith("$"):
            return 0
        if num1.endswith("#"):
            return -1
        try:
            num1 = float(num1)
            break
        except:
            print("Not a valid number,please enter again")

    # ----- INPUT SECOND NUMBER -----
    while True:
        num2 = input("Enter second number: ")
        print(num2)
        if num2 == "$":
            return 0
        if num2 == "#":
            return -1
        if num2.endswith("$"):
            return 0
        if num2.endswith("#"):
            return -1
        try:
            num2 = float(num2)
            break
        except:
            print("Not a valid number,please enter again")

    # ----- PERFORM OPERATION -----
    result = None
    try:
        if choice == '+':
            result = add(num1, num2)
        elif choice == '-':
            result = subtract(num1, num2)
        elif choice == '*':
            result = multiply(num1, num2)
        elif choice == '/':
            result = divide(num1, num2)
        elif choice == '^':
            result = power(num1, num2)
        elif choice == '%':
            result = remainder(num1, num2)
    except:
        print("Something Went Wrong")

    print(f"{float(num1)} {choice} {float(num2)} = {result}")
    return 0



#End the select_op(choice) function here
#-------------------------------------
#This is the main loop. It covers Task 1 (Section 1)
#YOU DO NOT NEED TO CHANGE ANYTHING BELOW THIS LINE
while True:
  print("Select operation.")
  print("1.Add      : + ")
  print("2.Subtract : - ")
  print("3.Multiply : * ")
  print("4.Divide   : / ")
  print("5.Power    : ^ ")
  print("6.Remainder: % ")
  print("7.Terminate: # ")
  print("8.Reset    : $ ")
  

  # take input from the user
  choice = input("Enter choice(+,-,*,/,^,%,#,$): ")
  print(choice)
  if(select_op(choice) == -1):
    #program ends here
    print("Done. Terminating")
    exit()