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# at the top:
import operator
 
# the rest of your application
 
operator = input("Enter your oeprator out of: ...")
if operator not in ("+", ...):
    raise ValueError(f"Invalid Operator: {operator}")
 
def mydivision(num1: float, num2: float) -> float:
    if num2 == 0:
        raise ValueError("Division by zero not allowed")
    return num1 / num2
 
OPERATOR_MAP = {
    "+": operator.add,
    "*": operator.mul,
    "-": operator.sub,
    "/": mydivision,  # because of null handling
}
 
MESSAGE_MAP = {
    "+": "The sum of two numbers is: ",
    "*": "The multiplication of two numbers is: ",
    "-": "The subtraction of two numbers is: ",
    "/": "The division of two numbers is: ",
}
 
result = OPERATOR_MAP[operator](num1, num2)
print(MESSAGE_MAP[operator], result)

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python2.7/py_compile.py", line 117, in compile
    raise py_exc
py_compile.PyCompileError:   File "prog.py", line 7
    if operator not in ("+", ...):
                             ^
SyntaxError: invalid syntax

Standard output is empty