text: from flask_wtf import FlaskForm
  from wtforms import StringField, PasswordField, SubmitField, BooleanField
  from wtforms.validators import DataRequired, Length, Email, EqualTo, ValidationError
  from flaskblog.models import User
  
  
  class RegistrationForm(FlaskForm):
      username = StringField('Username', 
          validators = [DataRequired(), Length(min = 2, max = 20)])
  
      email = StringField('Email', 
          validators = [DataRequired(), Email()])
  
      password = PasswordField('Password', validators = [DataRequired()])
      confirm_password = PasswordField('Confirm Password', 
          validators = [DataRequired(), EqualTo('password')])
      submit = SubmitField('Sign Up')
  
      def validate_username(self, username):
          user = User.query.filter_by(username=username.data).first()
          if user:
              raise ValidationError('That username is taken, please choose a different one')
  
      def validate_email(self, email):
          user = User.query.filter_by(email=email.data).first()
          if user:
              raise ValidationError('That email is taken, please choose a different one')
  
  class LoginForm(FlaskForm):
      email = StringField('Email', 
          validators = [DataRequired(), Email()])
      password = PasswordField('Password', validators = [DataRequired()])
      remember = BooleanField('Remember Me')
      submit = SubmitField('Login')
      
  
  
  
         