如何使用作为同一jinja2脚本中的字符串的超级块扩展Python模板

from jinja2 import Environment, BaseLoader

template_dir = 'path/to/templates'  # 模板文件所在的目录
loader = BaseLoader()
env = Environment(loader=loader, autoescape=True, trim_blocks=True, lstrip_blocks=True)

template_string = '''
{% block content %}
Hello, {{ name }}!
{% endblock %}
'''

template = env.from_string(template_string)
rendered = template.render(name='John')

base_template_string = '''
{% block content %}
{% endblock %}

{% block sidebar %}
{% endblock %}
'''

extended_template_string = '''
{% extends "base_template.html" %}

{% block content %}
Hello, {{ name }}!
{% endblock %}

{% block sidebar %}
Welcome to my website!
{% endblock %}
'''

base_template = env.from_string(base_template_string)
extended_template = env.from_string(extended_template_string)
rendered_base = base_template.render()
rendered_extended = extended_template.render(name='John')