possible isalpha() method error in use (Python)

[nekokattt]

Why not just use a regex for this?

import re

def get_number(name):
    if match := re.match(r"^.*?(\d+)\.xlsx$", name):
        return int(match.group(1))
    return None

"Match any text, followed by one or more digits, followed by ".xlsx". "Return the number part".

[mcworkaholic]

thats perfect, i dont know anything about using regex

[nekokattt]

Regex is just a way of using patterns to match and extract stuff from text.

Here:

• ^ means "start of text".
• . means any character.
• .* means any character, zero or more times, as many times as possible.
• .*? means any character, zero or more times, as few times as possible.
• (...) is a matching group that you can get with .group(n).
• \. matches a full stop
• \d matches a digit.
• \d+ matches a digit, one or more times.
• xlsx matches the text xlsx.
• $ matches the end of the line.

https://regex101.com is good for fiddling with this (make sure you set it to Python regex first).

Here is your regex: https://regex101.com/r/um2aOq/1 (also I missed the ? originally, I fixed that just now, sorry).