code: def get_modules(paths, toplevel=True):
      
      modules = []
      for path in paths:
          path = os.path.abspath(path)
          if toplevel and path.endswith('.pyc'):
              sys.exit('.pyc files are not supported: {0}'.format(path))
          if os.path.isfile(path) and (path.endswith('.py') or toplevel):
              modules.append(path)
          elif os.path.isdir(path):
              subpaths = [
                  os.path.join(path, filename)
                  for filename in sorted(os.listdir(path))]
              modules.extend(get_modules(subpaths, toplevel=False))
          elif toplevel:
              sys.exit('Error: {0} could not be found.'.format(path))
      return modules
docs: Take files from the command line even if they don't end with .py.