Switch case or match case?

[Frankduc]

Here one more as training,so it's a switch/case on steroids🧨
Python, match/case(structured pattern matching) is actually much more than a simple switch/case.

So a couple of thing can nest case together with | and case _: work as else:
I would say that code has a clean look,and quite readable even if not seen structured pattern matching before.

from operator import add, sub, mul, truediv

def calculate():
    us_in = input("Select operation +, -, *, /: ")
    n1 = int(input("Fist number: "))
    n2 = int(input("Second number: "))
    op = {
        "+": add(n1, n2),
        "-": sub(n1, n2),
        "*": mul(n1, n2),
        "/": truediv(n1, n2),
    }
    match us_in:
        case ("+"|"-"|"*"|"/") as calc:
            print(f'{n1} {us_in} {n2} = {op[calc]}\n')

def menu():
    while True:
        print("(1) Calculate two numbers")
        print("(Q) Quit")
        choice = input("Enter your choice: ").lower()
        match choice:
            case '1':
                calculate()
            case 'q':
                return
            case _:
                print(f"Not a correct choice <{choice}>,try again\n")

if __name__ == "__main__":
    menu()

Test that his work.

Output:
(1) Calculate two numbers
(Q) Quit
Enter your choice: 1
Select operation +, -, *, /: /
Fist number: 9
Second number: 4
9 / 4 = 2.25

(1) Calculate two numbers
(Q) Quit
Enter your choice: car
Not a correct choice <car>,try again

(1) Calculate two numbers
(Q) Quit
Enter your choice: 1
Select operation +, -, *, /: *
Fist number: 99
Second number: 5
99 * 5 = 495

(1) Calculate two numbers
(Q) Quit
Enter your choice: Q

I cant make it work, :

Error:
File "<string>", line 15
    match us_in:
          ^
SyntaxError: invalid syntax
> 

Cant say what is wrong still trying to understand how it works.