ls

import os

# quickly list files in a dir with specific filetype
# without recursion into subdirs

thepath = '/Your_Dir/'   # some path
filetype = '.py'         # use this format .bla

le=len(filetype)
pdffiles = [i for i in os.listdir(thepath) if i[-le:] == filetype]
for afile in pdffiles:
  print afile