Calculator(Shortend from a code of a fellow member from pycharmers group)

calc.py

import math

def get_num():
    inp = input("Enter a number: ")
    try:
        return float(inp)
    except:
        print("Enter a valid number.")
        get_num()

operation_dispatcher = {
    'add': lambda: get_num() + get_num(),
    '+': lambda: get_num() + get_num(),
    'subtract': lambda: get_num() - get_num(),
    '-': lambda: get_num() - get_num(),
    'multiply': lambda: get_num() * get_num(),
    '*': lambda: get_num() * get_num(),
    'divide': lambda: get_num() / get_num(),
    '/': lambda: get_num() / get_num(),
    'exponent': lambda: get_num() ** get_num(),
    'sqrt': lambda: math.sqrt(get_num()),
    'absolute': lambda: math.absolute(get_num()),
    'fac': lambda: math.factorial(get_num()),
    'roundoff': lambda: int(float(get_num())),
    'round': lambda: int(round(get_num()))
}

print("Welcome to calculator!")
while True:
    inp = input("Enter an operation: ").lower()
    if inp == "exit":
        print("Bye.")
        break
    else:
        try:
            print(operation_dispatcher[inp]())
        except:
            print("Operation not recognized.")