Hexadecimal errors when hitting back-space while using inquirer module

[Eclair_de_XII]

TL;DR Summary

Basically, the inquirer module is like a module for advanced forms of user-input, like having the user select from a list, multiple choice, text, etc. Documentation is here.

https://python-inquirer.readthedocs.io/en/latest/

I'm using this user-defined module for an amateur coding project, and I am using 'Text' from the 'inquirer' module. When I am either inputting things, or whenever I am validating things, I always get some sort of error. These errors mainly result whenever I hit the back-space key on my keyyboard. I am reconsidering doing this using the 'raw_input' built-in function to do so, but it would be nice to know how to figure out the source of my problem.

This is a sample of code that I wrote that illustrates one of the two dilemmas I am having.

from inquirer import errors, prompt, Text

def check_even(ans,cur):
    if int(cur)%2!=0:
        raise errors.ValidationError('',reason='The inputted integer is not even!')
    return True

def is_this_even(hex10_error=True):
    if hex10_error:
        val=True
    else:
        val=check_even
    question=[Text(
        name='',
        message='Please input some integer...',
        validate=val
    )]
    return int(prompt(question)['']) % 2 == 0

if __name__=='__main__':
    error=True
    even=is_this_even(error)
    print(even)

This error passes the error (back-space and all) and then gets an error when the function attempts to convert the string number to integer. My main objective here is to get rid of all these \x08 from the backspaces.

[?] Please input some integer...: 4564
Traceback (most recent call last):
  File "C:/Users/Eclair/Documents/3 Projects/Project Aenir/test.py", line 17, in <module>
    even=is_this_even()
  File "C:/Users/Eclair/Documents/3 Projects/Project Aenir/test.py", line 14, in is_this_even
    return int(prompt(question)['']) % 2 == 0
ValueError: invalid literal for int() with base 10: '4564\x08\x08\x08\x08\x08'

The second error results when I back-space after initially giving bad input. After giving bad input and back-spacing, the program gives the error message in line 12, instead of the expected one in line 13.

[?] Please input some integer...: 4545

>> "454" is not a valid .
>> The inputted integer is not even!

I honestly do not know enough about coding to know why this happens, so please forgive the lack of effort on my part.

 

[jedishrfu]

The problem appears to be that the user-defined module you are using doesn't handle backspacing. Basically it returning a string to you with the bad digits and the backspacing to remove them.

You will need to write some code to walk the string and handle the backspacing unless there is an option with the user-defined Inquirer module to do that. It doesn't seem so as I looked at it docs briefly online.

The code below handles removing the backspaces but you'll have to replace the '#' with the backspace character.

https://www.geeksforgeeks.org/string-after-processing-backspace-characters/