# find all text files in directory or any type of files in directory
import glob, os
os.chdir("/mydir")
for file in glob.glob("*.txt"):
print(file)
or
import os
for file in os.listdir("/mydir"):
if file.endswith(".txt"):
print(os.path.join("/mydir", file))
or
import glob
glob.glob('./*.txt')
for root, dirs, files in os.walk(directory):
for file in files:
if file.endswith('.txt'):
print(file)