我有这个小的Flask程序。它期望用户的姓名和年龄，然后打印一条消息。真的很容易，因为我刚刚开始使用Python和Flask。
from flask import Flask, render_template
from flask.ext.bootstrap import Bootstrap
from flask.ext.wtf import Form
from wtforms import StringField, IntegerField, SubmitField
from wtforms.validators import Required, Length, NumberRange
app = Flask(__name__)
app.config['SECRET_KEY'] = 'top secret!'
bootstrap = Bootstrap(app)
class NameForm(Form):
name = StringField('What is your name?', validators = [Required(), Length(1, 16)])
age = IntegerField('How old are you?', validators = [Required(), NumberRange(min=1, max=99, message="Should be between 1 and 99")])
submit = SubmitField('Submit')
@app.route('/', methods=['GET', 'POST'])
def index():
name = None
age = None …