Convert an integer number to another system - such as to binary, hex, etc. (Python example)

num2bin.py

#!/usr/bin/env python

from itertools import chain
from sys import exit

def num_to_bin():
    try:
        original_number = int(input('Chose the number: '))
        basis = int(input('Chose the basis (up to 32): '))
        if(basis > 32):
            raise ValueError('The basis can be up to 32.')
    except ValueError as e:
        print('Number is incorrect')
        exit(e)
    num = original_number
    number_dict = {}
    codes = chain(range(0, 10), range(97, 123))
    for code in codes:
        if code < 10:
            number_dict[code] = code
        else:
            number_dict[code - 87] = chr(code)
    res = ''
    while True:
        quotinent = num % basis
        res += str(number_dict[quotinent])
        num //= basis
        if num == 0:
            break
    res = res[::-1]
    print(original_number, ' - ', res)

try:
    num_to_bin()
except SystemExit as e:
    print(e)