Getting Error : 'int' object has no attribute 'isnumeric'

Question

I was writing a code to get a student grade point average but I got an error. here is the piece of my code getting error :

scoreinput=input("Score lesson: ")
while True:
    if scoreinput.isnumeric():
        scoreinput=int(scoreinput)
        if scoreinput > 20:
            scoreinput = int(input("This number is too big. Try again: "))
        elif scoreinput < 0:
            scoreinput = int(input("This number is too low. Try again: "))
    else:
        print("please write number correctly...")

This is the output of this code which has got an error :

Score lesson: 5
Traceback (most recent call last):
  File "e:\TEST PYTHON\test3.py", line 3, in <module>
    if scoreinput.isnumeric():
AttributeError: 'int' object has no attribute 'isnumeric

please help me. thanks

Answer 1

If the input is a positive number below 20, which is what you want to have, after scoreinput=int(scoreinput) you have the number, but instead of doing something, you continue to the next iteration of the while loop. On the next iteration, scoreinput is an int and not str this is why you get an error. If scoreinput is in the correct range, you should use break to stop the loop.

Another problem occurs when the input is wrong. If the input is not a number, you are not getting a new input and will be stuck in an infinite loop. If the input is a number, but not between 0 to 20, you get new input and imminently cast it to int. If the input is not a number you will get an exception. If it is a number, it will fail as soon as you reach the next iteration since scoreinput should be str at the beginning of the iteration, but it will be int.

I would suggest you will use the following code:

while True:
    scoreinput=input("Score lesson: ")  # using input only one time at the beggining of the loop instead of input command for each case of bad input
    if scoreinput.isnumeric():
        scoreinput=int(scoreinput)
        if scoreinput > 20:
            print("This number is too big. Try again.")
        elif scoreinput < 0:
            print("This number is too low. Try again.")
        else:
            break  # input is valid
    else:
        print("please write number correctly...")

Answer 2

If you write on the top: scoreinput = int(input('Score lesson: ')) you won't have to verify if scoreinput is numeric or alphabetic.