wtforms 简单使用

from flask import Flask,request,render_template
from wtforms import Form,StringField
from wtforms import validators
from wtforms.validators import Length,EqualTo


class RegisterForm(Form):
    username = StringField(validators=[Length(max=10,min=3,message='用户名长度不正确')])
    password = StringField(validators=[Length(max=10,min=3,message='密码长度不正确')])
    password_repeat = StringField(validators=[Length(max=10,min=3,message='密码长度不正确'),EqualTo('password')])


app = Flask(__name__)


@app.route('/')
def hello_world():
    return 'Hello World!'


@app.route('/register/',methods=['get','post'])
def register():
    if request.method == 'GET':
        return render_template('register.html')
    else:
        # username = request.form.get('username')
        # password = request.form.get('password')
        # password_repeat = request.form.get('password_repeat')
        # if 3 > len(username) or len(username)> 10:
        #     return '用户名长度不正确'
        # if 3 > len(password) or len(password)> 10:
        #     return '密码长度不正确'
        # if password != password_repeat:
        #     return '密码输入不一致'
        form = RegisterForm(request.form)
        if form.validate():
            return 'success'
        else:
            print(form.errors)#{'username': ['用户名长度不正确'],
            # 'password': ['密码长度不正确'], 'password_repeat': ['密码长度不正确']}
            #因为是字典，获取方式我就不写了
            return 'fail'

if __name__ == '__main__':
    app.run(debug=True)