Let's write a simple REPL (read evaluate print loop) calculator that can handle addition, subtraction, multiplication, and division. Ask the user for an operator and each operand. Don't forget that input returns a string, which you can convert to a float using float(user_input) where user_input is the string you got from input. Below is some sample input/output.
> What is the operation you'd like to perform? +
> What is the first number? 5
> What is the second number? 12
> 5 + 12 = 17
Allow the user to keep performing operations until they say 'done'. Use while True and break. Below is some sample input/output.
> what is the operation you'd like to perform? +
> what is the first number? 5
> what is the second number? 12
> 5 + 12 = 17
> what is the operation you'd like to perform? done
> goodbye!
Allow the user to enter a full arithmetic expression and use eval to evaluate it.