flask框架jinja2模板与模板继承实例分析
本文实例讲述了flask框架jinja2模板与模板继承。分享给大家供大家参考,具体如下:
jinja2模板
from werkzeug.contrib.cache import SimpleCache from flask import Flask, request, render_template,redirect,abort, url_for CACHE_TIME = 300 cache = SimpleCache() cache.timeout = CACHE_TIME app = Flask(__name__) @app.before_request def return_cached(): if not request.values: response = cache.get(request.path) if response: print("Got the page from cache!") return response print("Will load the page!") @app.after_request def cache_response(response): print("aaaaaaaaaaaaaaaaaaaaaa") if not request.values: cache.set(request.path, response, CACHE_TIME) return response @app.teardown_request def teardown_request(response): print('llllllllllllllllllllllll') return "llllllllllllllllllllll" # @app.route('/') @app.route('/get_index') def index(): return render_template('jinja2.html', a_variable="Developer", navigation=["http://www.163.com", "www.baidu.com"]) if __name__ == '__main__': app.run(port=8000)
jinja2.html必须在templates文件夹下,例子如下:
<!DOCTYPE html> <html> <head> <title>jinja2_test</title> </head> <body> <ul id="navigation"> {% for item in navigation %} #表达式 <li href='{{ item }}'>{{ item }}</li> #输出变量 {% endfor %} </ul> <h1>HelloWorld</h1> {{a_variable}}#输出变量 {# aaaa #}#模板注释,加载自动删除 </body> </html>
jinja2模板继承
父亲:
<!DOCTYPE html> <html> <head> <title>模板继承</title> </head> <body> <span>这是基模板</span> <div id="content">{% block content %}{% endblock %}</div> </body> </html>
用{% block content %}{% endblock %}
包含jinja2的字模板块;
子:
<!DOCTYPE html> <html> <head> <title>模板继承</title> </head> <body> {% extend "jinja2_模板继承.html"%} {% block content %} <p class="importtant">我在子模板</p> </body> </html>
{% extends "jinja2_模板继承.html"%}
标签是这里的关键,告诉模板引擎这个模板继承自另外一个模板。该标签必须是子模板的第一个标签,解释器会自动将父亲的内容复制到子模板中!
结果应该是这样:
<!DOCTYPE html> <html> <head> <title>模板继承</title> </head> <body> <span>这是基模板</span> <div id="content"> <p class="importtant">我在子模板</p> </div> </body> </html>
希望本文所述对大家基于flask框架的Python程序设计有所帮助。
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