python count files directory

1import os
2len(os.listdir(directory))

1# accepts any number of paths, 
2# returns the total amound of files (not dirs) that are in the given paths
3# looks recursively
4
5def countFiles(*paths):
6    """
7    :param paths: list of all paths, the number of files are added
8    :return: return the number of files (not directories) in the folders recursively (subfolders are checked as well)
9    """
10    def helper(path: str):
11        count = 0
12        # iterate through all files and dir names in path
13        for fileName in os.listdir(path):
14            filePath = join(path, fileName)
15            if isfile(filePath): # if file, increment
16                count += 1
17            elif isdir(filePath): # if dir, recursively count files in dir
18                count += helper(filePath)
19        return count
20
21    numFiles = 0
22    for path in paths:
23        numFiles += helper(path)
24    return numFiles