Flask Web服务开发

Flask做轻量级的Web服务开发很方便， 只需要pip install所需安装包即可，依赖的较少且容易获取。简单的程序如下所示：

#!/usr/bin/env pythonfrom flask import Flaskfrom flask_wtf import FlaskFormfrom flask import render_template, requestfrom wtforms import StringField, SubmitFieldfrom wtforms.validators import Requiredfrom wtforms import Form, BooleanField, StringField, PasswordField, validatorsapp = Flask(__name__)class NameForm(FlaskForm):    name = StringField('What is your name?', validators=[Required()])    submit = SubmitField('Submit')@app.route('/')def index():    form = NameForm()    if form.validate_on_submit():        print form.name.data    #return '<h1>Hello World!</h1>'  class RegistrationForm(FlaskForm):    username = StringField('Username', [validators.Length(min=4, max=25)])    email = StringField('Email Address', [validators.Length(min=6, max=35)])    password = PasswordField('New Password', [        validators.DataRequired(),        validators.EqualTo('confirm', message='Passwords must match')    ])    confirm = PasswordField('Repeat Password')    accept_tos = BooleanField('I accept the TOS', [validators.DataRequired()])@app.route('/register', methods=['GET', 'POST'])def register():    form = RegistrationForm()    if request.method == "POST":        print request.form["username"]        '''    if form.validate_on_submit():        print form.username.data        flash(form.username.data)    '''    return render_template('register.html', form=form, title = 'register')@app.route('/user/<name>')def user(name):    #return '<h1>Hello, %s!</h1>' % name    return render_template('hello.html', name=name)if __name__ == '__main__':    app.config.from_object('config')    app.run(debug=True, host= '0.0.0.0')

register.html

{% from "_formhelpers.html" import render_field %}<form method=post action="/register">  <dl>    {{ render_field(form.username) }}    {{ render_field(form.email) }}    {{ render_field(form.password) }}    {{ render_field(form.confirm) }}    {{ render_field(form.accept_tos) }}  </dl>  <p><input type=submit value=Register></form>

_formhelpers.html

{% macro render_field(field) %}  <dt>{{ field.label }}  <dd>{{ field(**kwargs)|safe }}  {% if field.errors %}    <ul class=errors>    {% for error in field.errors %}      <li>{{ error }}</li>    {% endfor %}    </ul>  {% endif %}  </dd>{% endmacro %}

表单程序处理见register函数
http://flask.pocoo.org/docs/0.11/patterns/wtforms/
http://blog.csdn.net/zhu_free/article/details/45953325
http://blog.csdn.net/aotony_1988/article/details/40615149