This script runs all .py files in all subdirectories

runall.py

import os

path = os.getcwd()
for root, dirs, files in os.walk(path):
  print("visiting: ", root)
  os.chdir(root)
  py_files = [file for file in files if file[-3:]=='.py']
  for py_file in py_files:
    cmd = "python {0}".format(py_file)
    print("running: ", cmd)
    os.system(cmd)

os.chdir(path)