old_contents: from flask.ext.wtf import Form
  from wtforms import StringField, PasswordField, BooleanField, SubmitField, ValidationError
  from wtforms.validators import Required, Email, Length, Regexp, EqualTo
  from ..models import User
  
  
  class LoginForm(Form):
      email = StringField('Email', validators=[Required(), Length(1, 64), Email()])
      password = PasswordField('Password', validators=[Required()])
      remember_me = BooleanField('Keep me logged in')
      submit = SubmitField('Login')
  
  class RegistrationForm(Form):
      email = StringField('Email', validators=[Required(), Length(1, 64), Email()])
      username = StringField('Username', validators=[Required(), Length(1, 64), Regexp('^[A-Za-z][A-Za-z0-9_.]*$', 0, 'Usernames must have only letters, numbers, dots or underscore.')])
      password = PasswordField('Password', validators=[Required(), EqualTo('password2', message='Passwords must match')])
      password2 = PasswordField('Confirm password', validators=[Required()])
      submit = SubmitField('Register')
  
      def validate_email(self, field):
          if User.query.filter_by(email=field.data).first():
              raise ValidationError('Email already registered.')
  
      def validate_username(self, field):
          if User.query.filter_by(username=field.data).first():
              raise ValidationError('Username already in use.')
  
new_contents: from flask.ext.wtf import Form
  from wtforms import StringField, PasswordField, BooleanField, SubmitField, ValidationError
  from wtforms.validators import Required, Email, Length, Regexp, EqualTo
  from ..models import User
  
  
  class LoginForm(Form):
      email = StringField('Email', validators=[Required(), Length(1, 64), Email()])
      password = PasswordField('Password', validators=[Required()])
      remember_me = BooleanField('Keep me logged in')
      submit = SubmitField('Login')
  
  class RegistrationForm(Form):
      email = StringField('Email', validators=[Required(), Length(1, 64), Email()])
      username = StringField('Username', validators=[Required(), Length(1, 64), Regexp('^[A-Za-z][A-Za-z0-9_.]*$', 0, 'Usernames must have only letters, numbers, dots or underscore.')])
      password = PasswordField('Password', validators=[Required(), EqualTo('password2', message='Passwords must match')])
      password2 = PasswordField('Confirm password', validators=[Required()])
      submit = SubmitField('Register')
  
      def validate_email(self, field):
          if User.query.filter_by(email=field.data).first():
              raise ValidationError('Email already registered.')
  
      def validate_username(self, field):
          if User.query.filter_by(username=field.data).first():
              raise ValidationError('Username already in use.')
              
              
  class ChangePasswordForm(FlaskForm):
      old_password = PasswordField('Old password', validators=[Required()])
      password = PasswordField('New password', validators=[
          Required(), EqualTo('password2', message='Passwords must match')])
      password2 = PasswordField('Confirm new password', validators=[Required()])
      submit = SubmitField('Update Password')
  
  
  class PasswordResetRequestForm(FlaskForm):
      email = StringField('Email', validators=[Required(), Length(1, 64),
                                               Email()])
      submit = SubmitField('Reset Password')
  
  
  class PasswordResetForm(FlaskForm):
      email = StringField('Email', validators=[Required(), Length(1, 64),
                                               Email()])
      password = PasswordField('New Password', validators=[
          Required(), EqualTo('password2', message='Passwords must match')])
      password2 = PasswordField('Confirm password', validators=[Required()])
      submit = SubmitField('Reset Password')
  
      def validate_email(self, field):
          if User.query.filter_by(email=field.data).first() is None:
              raise ValidationError('Unknown email address.')
  
  
  class ChangeEmailForm(FlaskForm):
      email = StringField('New Email', validators=[Required(), Length(1, 64),
                                                   Email()])
      password = PasswordField('Password', validators=[Required()])
      submit = SubmitField('Update Email Address')
  
      def validate_email(self, field):
          if User.query.filter_by(email=field.data).first():
              raise ValidationError('Email already registered.')
              
              
              
  
subject: Update forms.py