I’m writing a calculator as my first project and i want the code to print a message and stop sequence if one of these 4 functions isn’t given ( + – * /), however the program still asks you for 2 numbers before it stops.

This is what i have

if operator == "+" or operator == "-" or operator == "*" or operator == "/":
    num_1 = float(input("Chose number 1"))

    num_2 = float(input("Chose number 2"))

else:
 print(f"{operator} ain't right")

i have tried,

if operator == "+" or "-" or.. 

but it stills asks you for the numbers,

this does not happen when only one is in the if statement