main.py

def permission_decorator(permission):
  def _permission_decorator(func):
    def permission_wrapper(*args, **kwargs):
      if someUserApi.hasPermission(permission):
        result = func(*args, **kwargs)
        return result
      return None
    return permission wrapper
  return _permission_decorator

@permission_decorator('admin')
def delete_user(user):
  someUserApi.deleteUser(user)