Question

What is wrong in this code? I want to find a specified file in folder. Thansk for your help.

import os, fnmatch

def find(root, mask): //Error
    files_list = os.listdir(os.path.abspath(root))
    for filename in fnmatch.filter(files_list, mask):
        yield filename

def test():
    res = find ('D:\\Sample\\', 'hallo.txt') 

test()

the error:

Error: Traceback (most recent call last): def find(root, mask): NoneType

Answer 1

Your function is a generator, it will yield filenames one by one. You can call list on res if you want a list of all matches:

list_of_matches = list(res)

Also your default argument of root=os.dir makes no sense. Maybe use '.'?