Why doesn't os.path.isdir work?

Question

Python

import os
import glob

def finder(path,mask):
    os.chdir(path)
    print(os.getcwd())
    if len(glob.glob(mask)):
        print(glob.glob(mask))
    dir_list = os.listdir()    
    for dirt in dir_list:
        if os.path.isdir(os.path.abspath(dirt)):# строка 1
            print(dirt)
            finder(dirt,mask)
        else:
            print(dirt,'is not dir')

The code should receive the path and use it to search for files by pattern.
But for some reason, when checking, it turns out that most of the folders are not folders, what's the problem?

Answer 1

Python - how to find files and skip directories in...

basepath = '/path/to/directory'
for fname in os.listdir(basepath):
    path = os.path.join(basepath, fname)
    if os.path.isdir(path):
        # skip directories
        continue

Answer 2

there is such a thing - code