code: def create_env_by_folder(folder):
      
      global _default_filters
      global _default_tests
      env = jinja2.Environment(loader=jinja2.FileSystemLoader(folder))
  
      for k, f in _default_filters.iteritems():
          env.filters[k] = f
  
      for k, f in _default_tests.iteritems():
          env.tests[k] = f
  
      return env
docs: Create :mod:`jinja2` environment with :meth:`jinja2.FileSystemLoader`
  
      :param folder: folder path.
      :return: jinja2 environment object.