Find all files in a directory with extension .txt in Python

Their are many methods to solve python list files in directory with extension it:

os.walk

 >>> import os
>>> path = '/user/Bluetooth/cramp/charm'
>>> text_files = [f for f in os.listdir(filedestination) if f.endswith('.txt')]
>>> text_files
['qwe-cn.txt', 'zxc-jp.txt', 'qwe-kr.txt', 'qwe-tw.txt', ... 'mac-10.txt']
Or 
Glob 
>>> import glob
>>> glob.glob('./*.txt')
['./Maths.txt', './physics.txt', './chem.txt', './bio.txt']
Or fnmatch.filter()
 import fnmatch, os
print fnmatch.filter(os.listdir("/qwe"), "*.tx?") #