Threading, acquire and lock with search

import threading
import queue
import os


class SearchFiles(threading.Thread):
    def __init__(self, q):
        self.lock = threading.Lock()
        self.files = []

    def run(self):
        path = q.get()
        if os.path.exists(path):
            print("Searching...")
            for root, dirs, files in os.walk(path):
                for f in files:
                    q.put(os.path.join(root, f))
                    self.lock.acquire()
                    self.append()
                    self.lock.release()
            else:
                files = self.result()
                tam = len(files)
                for f in files:
                    print(f)
                print("%d files" % tam)

    def append(self):
        self.files.append(q.get())

    def result(self):
        return self.files

if __name__ == '__main__':
    q = queue.Queue()
    q.put("C:\\Windows")
    files = SearchFiles(q)
    files.run()