#TODO: Write the functions for arithmatic operations here
#These functions should cover Task 2
def add(a,b):
    return a+b
def substract(a, b):
    return a - b
def multiply(a,b):
    return a*b
def divide(a, b):
    try:
        return a/b
    except Exception as d:
        print(d)
def power(a,b):
    return a ** b
def remainder(a,b):
    return a%b

#-------------------------------------
#TODO: Write the select_op(choice) function here
#This function sould cover Task 1 (Section 2) and Task 3
def select_op(choice):
    if choice  == '#':
        return -1
    elif choice == '$':
        return 0
    elif choice in ('+','-','*','/','^','%','#','$'):
        while (True):
            first_num = str(input('Enter first number: '))
            print(first_num)
            if first_num.endswith ('$'):
                return 0
            if first_num.endswith ('#'):
                return -1
            try:
                num1 = float(first_num)
                break
            except:
                print("Not a valid number,please enter again")
                continue
        while (True):
            sec_num = str(input('Enter second number: '))
            print(sec_num)
            if sec_num.endswith ('$'):
                return 0
            if sec_num.endswith ('#'):
                return -1
            try:
                num2 = float(sec_num)
                break
            except:
                print("Not a valid number,please enter again")
                continue

#2.0 + 4.0 = 6.0

        if choice == '+':
            print(num1, '+', num2, '=', add(num1,num2))
        elif choice == '-':
            print(num1, '-', num2, '=', substract(num1,num2))
        elif choice == '*':
            print(num1, '*', num2, '=', multiply(num1,num2))
        elif choice == '^':
            print(num1, '^', num2, '=', power(num1,num2))
        elif choice == '/':
            print(num1, '/', num2, '=', divide(num1,num2))
        elif choice == '%':
            print(num1, '%', num2, '=', remainder(num1,num2))
        else:
            print("Something Went Wrong")
    else:
        print("Unrecognized operation")

#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()

**Select operation. 1.Add : + 2.Subtract : - 3.Multiply : * 4.Divide : / 5.Power : ^ 6.Remainder: % 7.Terminate: # 8.Reset : $ Enter choice(+,-,,/,^,%,#,$): + + Enter first number: 4 4 Enter second number: 5 5 4.0 + 5.0 = 9.0 Select operation. 1.Add : + 2.Subtract : - 3.Multiply : * 4.Divide : / 5.Power : ^ 6.Remainder: % 7.Terminate: # 8.Reset : $ Enter choice(+,-,,/,^,%,#,$): $** **$ Select operation. 1.Add : + 2.Subtract : - 3.Multiply : * 4.Divide : / 5.Power : ^ 6.Remainder: % 7.Terminate: # 8.Reset : $ Enter choice(+,-,,/,^,%,#,$): / / Enter first number: 5 5 Enter second number: 0 0 float division by zero 5.0 / 0.0 = None Select operation. 1.Add : + 2.Subtract : - 3.Multiply : * 4.Divide : / 5.Power : ^ 6.Remainder: % 7.Terminate: # 8.Reset : $ Enter choice(+,-,,/,^,%,#,$): -**

Enter first number: 5 5 Enter second number: 0$ 0$ Select operation. 1.Add : + 2.Subtract : - 3.Multiply : * 4.Divide : / 5.Power : ^ 6.Remainder: % 7.Terminate: # 8.Reset : $ Enter choice(+,-,*,/,^,%,#,$): #

Done. Terminating

simple beginner calculator

def add(x, y):
    return x + y

def subtract(x, y):
    return x - y

def multiply(x, y):
    return x * y

def divide(x, y):
    return x / y

print("Select operation.")
print("1.Add")
print("2.Subtract")
print("3.Multiply")
print("4.Divide")

while True:
    choice = input("Enter choice(1/2/3/4): ")

    if choice in ('1', '2', '3', '4'):
        num1 = float(input("Enter first number: "))
        num2 = float(input("Enter second number: "))

        if choice == '1':
            print(num1, "+", num2, "=", add(num1, num2))

        elif choice == '2':
            print(num1, "-", num2, "=", subtract(num1, num2))

        elif choice == '3':
            print(num1, "*", num2, "=", multiply(num1, num2))

        elif choice == '4':
            print(num1, "/", num2, "=", divide(num1, num2))
        break
    else:
        print("Invalid Input")

prints,

Select operation. 1.Add 2.Subtract 3.Multiply 4.Divide Enter choice(1/2/3/4): 6 Invalid Input Enter choice(1/2/3/4): 1 Enter first number: 34 Enter second number: 54 34.0 + 54.0 = 88.0