Python-Functions-

#Create a calculator program that allows the user to perform mathematical operations on two numbers using basic functions and a dictionary to store the operations. The program should also have the ability to continue calculations with the result of previous calculations. #Instructions #Create four basic mathematical functions: 'add', 'subtract', 'multiply', and 'divide' that take in two numbers and return the result of the operation. #Create a dictionary 'operations' that assigns the functions to their corresponding operation symbols. #Create a function 'calculator' that prompts the user to input the first number. #Use a for loop to print the available operation symbols. #Create a while loop that will continue to run until the user chooses to end the current calculation. #Inside the while loop, prompt the user to select an operation symbol. #Prompt the user to input the second number. #Use the dictionary to retrieve the function that corresponds to the selected operation symbol and store it in a variable 'calculation_function' #Perform the calculation by calling the 'calculation_function' on the two input numbers and store the result in a variable 'answer'. #Print the equation and the result of the calculation. #Ask the user if they would like to continue using the result as the first number for further calculations. #If the user chooses to continue, update the 'num1' variable to the value of 'answer'. #If the user chooses to start a new calculation, set the 'should_continue' variable to false and call the 'calculator' function to start a new calculation.

#Python Functions Checkpoint SOLUTION

Basic mathematical functions

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): if y != 0: return x / y else: print("Error: Cannot divide by zero.") return None

Dictionary of operations

operations = { '+': add, '-': subtract, '*': multiply, '/': divide }

Calculator function

def calculator(): num1 = float(input("Enter the first number: "))

while True:
    print("Available operations:")
    for symbol in operations.keys():
        print(symbol, end=' ')
    print()

    operation_symbol = input("Choose an operation symbol (type 'end' to finish): ")

    if operation_symbol == 'end':
        break

    if operation_symbol not in operations:
        print("Invalid operation symbol. Please try again.")
        continue

    num2 = float(input("Enter the second number: "))

    calculation_function = operations[operation_symbol]
    answer = calculation_function(num1, num2)

    print(f"{num1} {operation_symbol} {num2} = {answer}")

    should_continue = input("Do you want to continue with the result? (yes/no): ").lower()

    if should_continue == 'yes':
        num1 = answer
    else:
        calculator()  # Start a new calculation

Start the calculator

calculator()