find_all_txt.py

import glob
import os
os.chdir("/mydir")
for file in glob.glob("*.txt"):
    print file

import os
for file in os.listdir("/mydir"):
    if file.endswith(".txt"):
        print file
        
        
import os
for root, dirs, files in os.walk("/mydir"):
    for file in files:
        if file.endswith(".txt"):
             print os.path.join(root, file)