from flask import Flaskapp = Flask(__name__)def hello_world():return 'Hello World!'if __name__ == '__main__':app.run()
二．路由请求方式的限定
# coding:utf-8from flask import Flaskapp = Flask(__name__)@app.route('/', methods=['GET', 'POST'])def index():return 'Hello World!'if __name__ == '__main__':app.run()
三．路由参数的处理
# coding:utf-8from flask import Flaskapp = Flask(__name__)# 当为int:时，限制只有可以转化成int的参数能找到def hello_someone(some_num):return 'hello %s' % some_numif __name__ == '__main__':app.run()
Jinja2的设计思想源于Django的模板引擎
Flask提供的render_template封装了Jinja2模板引擎
使用render_template
# coding:utf-8from flask import Flask, render_templateapp = Flask(__name__)def index():return render_template('index.html')if __name__ == '__main__':app.run()
涉及到的index.html, 路径：项目名/templates/index.html
<html lang="en"><head><meta charset="UTF-8"><title>Title</title></head><body>请开始你的表演</body></html>
五．模板中的变量代码块
定义字符串，list，dict等参数
# coding:utf-8from flask import Flask, render_templateapp = Flask(__name__)def index():url = 'www.python.org'pythons = ['python2', 'python3']param_dict = {'system': 'windows'}return render_template('index.html', python_url=url, pythons=pythons,param_dict=param_dict)if __name__ == '__main__':app.run(debug=True)
涉及到的html
<html lang="en"><head><meta charset="UTF-8"><title>Title</title></head><body>请开始你的表演<br><hr>python官网<br>{{ python_url }}<br><hr>get python<br>{{ pythons[1] }}{# pythons.1也可以 #}<hr>get system<br>{{ param_dict['system'] }}<br>{{ param_dict.system }}<br><hr>{# 这是一些注释 #}</body></html>
页面展示
{{% if pythons %}{{ python_url }}{% endif %}{% for python in pythons %}{{ python }}{% endfor %}
<hr>链式调用<br>{{ 'hello world' | reverse | upper }}<br>{{ "hello world" | reverse | upper }}<br><hr>safe: 禁用转义，是否解析标签<br><p>{{ '<em>hello</em>' | safe }}</p><hr>capitalize: 变量首字母大写<br>{{ 'hello world' | capitalize}}<br><hr>title: 每个单词首字母大写<br>{{ 'hello world' | title}}<br><hr>upper: 全部字母变大写<br>{{ 'hello world' | upper}}<br><hr>lower: 全部字母变小写<br>{{ 'HELLO world' | lower}}<br><hr>reverse: 反转<br>{{ 'hello world' | reverse}}<br><hr>format: 格式化输出<br>{{ '%s %d' | format('name', 123)}}<br><hr>striptags: 渲染之前把值中所有的HTML标签都删掉<br>{{ '<em>hello</em>' | striptags}}<br><hr>truncate: 字符串截断 用法还不是很清楚<br>{{ 'hello world' | truncate(5)}}<br><hr><hr><h1>list的操作</h1><br>first: 取列表第一个<br>{{ [1,2,3,4] | first }}<br><hr>last: 取列表最后一个<br>{{ [1,2,3,4] | last }}<br><hr>length: 获取列表长度<br>{{ [1,2,3,4] | length }}<br><hr>sum: 列表数据求和<br>{{ [1,2,3,4,9,9,6] | sum }}<br><hr>sort: 排序列表<br>{{ [1,2,3,4,9,9,6] | sort }}<br><hr>filter函数<br>{% filter upper %}fadfasrew{% endfilter %}
效果
from flask import Flask, render_template, request, flashapp = Flask(__name__)app.secret_key = 'xiangyingxiongzhijing'@app.route('/', methods=['GET', 'POST'])def index():if request.method == 'POST':username = request.form.get('username')password = request.form.get('password')password2 = request.form.get('password2')if not all([username, password, password2]):flash('param error')elif password != password2:flash('password 不一致')else:return '登陆成功'return render_template('normal_form.html')if __name__ == '__main__':app.run(debug=True)
涉及到的页面
<html lang="en"><head><meta charset="UTF-8"><title>Normal Form</title></head><body><form method="post"><label>用户名：</label><input type="text", name="username"><br><label>密码：</label><input type="password" name="password"><br><label>确认密码：</label><input type="password" name="password2"><br><input type="submit" value="提交"><br>{% for message in get_flashed_messages() %}{{ message }}{% endfor %}</form></body></html>
九. 今日摘抄
"一个民族之所以伟大""根本就在于""在任何困难和风险面前""都从来""不放弃""不退缩""不止步"
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