學習日記 | 5.29 [Python3] Python Web開發基礎
阿新 • • 發佈：2018-05-29
odi 編碼 AC htm extends app render www amp
註：這是一系列基於實驗樓網絡培訓的python學習日記，內容零散，只是便於我自己回顧，有需要請了解www.shiyanlou.com。
3. 實驗13: jinja2模板
flask的默認模板通過jinja2實現。
jinja使用一些特殊字符包含需要被解釋執行的代碼：{%語法語句%} {{python對象}} {#註釋#}。
通過set給jinja賦值變量：
{% set result = heavy_operation() %}
<p> {{ result }}</p>
在jinja2中用macro定義宏，也支持導入宏，如下：
{% from ‘macro.html‘ import course_item %}<div> {{ course_item(course) }} </div>
模板繼承：方便編碼共用的標題欄和尾部，繼承功能通過block，extends等關鍵字實現。
示例：
宏 macro.html：
{% macro course_item(course, type="bootstrap") %} <div> <p> type: {{ type }}</p> <p> name: {{course.name }}</p> <p> is_private: {{ course.is_private }}</p> </div> {% endmacro %}
須繼承的 base.html：
<body> <div> {% block header %} <p> this is header </p> {% endblock %} </div> <div>{% block content %}{% endblock %}</div> <div id="footer"> {% block footer %}© Copyright2017 by <a href="http://www.shiyanlou.com/">shiyanlou</a>. {% endblock %} </div> </body>
index.html:
<h1> this is the header</h1> <p> name: {{ course.name }}</p> <p> user count: {{ course.user_count }}</p> <p> teacher: {{ course.teacher }}</p> <p> teacher email: {{ course.teacher.email | hidden_email }}</p> <p> course tag length: {{ course.tags | length }}</p> <p> is_private: {{ course.is_private }}</p> <p> not exist: {{ course.not_exist }}</p> {% if course.is_private %} <p> course {{ course.name }} is private</p> {% elif course.is_member_course %} <p> course {{ course.name }} is member course </p> {% else %} <p> course {{ course.name }} is normal course </p> {% endif %} {% for tag in course.tags %} <span> {{ tag }} </span> {% endfor %} {% macro course_item(course, type="bootstrap") %} <div> <p> type: {{ type }}</p> <p> name: {{ course.name }}</p> <p> user count: {{ course.user_count }}</p> <p> teacher: {{ course.teacher }}</p> <p> is_private: {{ course.is_private }}</p> </div> {% endmacro %} <div> {{ course_item(course) }}</div> <p> {{ "=" * 20}}</p> <div> {{ course_item(course, type="louplus") }}</div>
app.py:
#!/usr/bin/env python3 # -*- coding:utf-8 -*- from flask import Flask, render_template app = Flask(__name__) app.config["TEMPLATES_AUTO_RELOAD"] = True def hidden_email(email): parts = email.split(‘@‘) parts[0] = "*****" return ‘@‘.join(parts) app.add_template_filter(hidden_email) @app.route(‘/‘) def index(): teacher = { "name": "tom", "email": "[email protected]" } course = { "name": "Python Basic", "teacher": teacher, "user_count": 5348, "price": 199.0, "lab": None, "is_private": False, "is_member_course": True, "tags": [‘python‘, ‘big data‘, ‘linux‘] } return render_template("index.html", course=course)
學習日記 | 5.29 [Python3] Python Web開發基礎