flask开发用户管理系统wtf版

#coding=utf-8
from flask import Flask
from flask import request
from flask import redirect
from flask import render_template
from wtforms import Form, TextField, PasswordField, validators

app = Flask(__name__)

class LoginForm(Form):
    username = TextField("username", [validators.Required()])
    password = PasswordField("password", [validators.Required()])

@app.route("/user", methods=["GET", "POST"])
def login_checked():
    myForm = LoginForm(request.form)
    if request.method == "POST":
        if not myForm.username.data:
            message = "please input your username"
            return render_template("index.html", message=message, form=myForm)
        if not myForm.password.data:
            message = "please input your password"
            return render_template("index.html", message=message, form=myForm)
        if myForm.username.data == "lala" and myForm.password.data == "" and myForm.validate():
            return redirect("http://www.taobao.com")
        else:
            message = "your username or password is wrong"
            return render_template("index.html", message=message, form=myForm)
    return render_template("index.html", form=myForm)

if __name__ == "__main__":
    app.run(port=8080)

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>user management</title>
</head>
<body>
    <div align="center">
    <h1>user management</h1>
        {% if message %}
        {{ message }}
        {% endif %}

    <form method="post" name="form">
        username : {{form.username}}
        <br/>
        password : {{form.password}}
        <br/>
        <input type="submit" name="submit" value="submit">
        <input type="reset" name="reset" value="reset">
    </form>
    </div>

</body>
</html>