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# Simple Calculator in Python

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 "Error! Division by zero."
    return x / y

def calculator():
    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(f"The result is: {add(num1, num2)}")
            elif choice == '2':
                print(f"The result is: {subtract(num1, num2)}")
            elif choice == '3':
                print(f"The result is: {multiply(num1, num2)}")
            elif choice == '4':
                print(f"The result is: {divide(num1, num2)}")
        else:
            print("Invalid input. Please select a valid operation.")
        
        next_calculation = input("Do you want to perform another calculation? (yes/no): ")
        if next_calculation.lower() != 'yes':
            break

    print("Calculator exiting. Goodbye!")

# Run the calculator
calculator()

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