Started coding yesterday. Please review "Basic Calculator" I made.

[BitPythoner]

You actually don't need 3 questions, you can string them into one:

def calculator1():
    global num1, num2, op
 
    equation = input("Enter an equation: ")
    try:
        answer = eval(equation) #This is the cool part, eval can actually take string input and do arithmetic operations with it.
        print("Your answer is: ", answer)
    except:
        print("ERROR: INVALID")

calculator1()

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Also, on line 21, why do you put except Exception? That is not necessary, except by itself catches all exceptions.