import os
for root, dirs, files in os.walk("myDir"):
  for file in files:
    if file.endswith(".jpg"):
      print(os.path.join(root, file))

import os
for root, dirs, files in os.walk("myDir"):
  for file in files:
    if file.contains("string1" & "string2"):
      print(os.path.join(root, file))