Wraps a function to run in a given directory.

def change_dir(directory):
  """
  Wraps a function to run in a given directory.

  """
  def cd_decorator(func):
    @wraps(func)
    def wrapper(*args, **kwargs):
      org_path = os.getcwd()
      os.chdir(directory)
      func(*args, **kwargs)
      os.chdir(org_path)
    return wrapper
  return cd_decorator