old_contents: #!/usr/bin/python
  # -*- coding: utf8 -*-
  from flask_wtf import Form
  
  from wtforms import TextField, PasswordField
  from wtforms.validators import DataRequired, Email, EqualTo, Length
  
  from .models import User
  
  class RegisterForm(Form):
      username = TextField('Username',
                      validators=[DataRequired(), Length(min=3, max=25)])
      email = TextField('Email',
                      validators=[DataRequired(), Email(), Length(min=6, max=40)])
      password = PasswordField('Password',
                                  validators=[DataRequired(), Length(min=6, max=40)])
      confirm = PasswordField('Verify password',
                  [DataRequired(), EqualTo('password', message='Passwords must match')])
  
      familyname = TextField('성', validators=[DataRequired(), Length(min=1, max=25)])
      name = TextField('이름', validators=[DataRequired(), Length(min=1, max=25)])
  
      def __init__(self, *args, **kwargs):
          super(RegisterForm, self).__init__(*args, **kwargs)
          self.user = None
  
      def validate(self):
          initial_validation = super(RegisterForm, self).validate()
          if not initial_validation:
              return False
          user = User.query.filter_by(username=self.username.data).first()
          if user:
              self.username.errors.append("Username already registered")
              return False
          user = User.query.filter_by(email=self.email.data).first()
          if user:
              self.email.errors.append("Email already registered")
              return False
          return True
new_contents: #!/usr/bin/python
  # -*- coding: utf8 -*-
  from flask_wtf import Form
  
  from wtforms import TextField, PasswordField
  from wtforms.validators import DataRequired, Email, EqualTo, Length
  
  from .models import User
  
  class RegisterForm(Form):
      username = TextField('Username',
                      validators=[DataRequired(), Length(min=3, max=25)])
      email = TextField('Email',
                      validators=[DataRequired(), Email(), Length(min=6, max=40)])
      password = PasswordField('Password',
                                  validators=[DataRequired(), Length(min=6, max=40)])
      confirm = PasswordField('Verify password',
                  [DataRequired(), EqualTo('password', message='Passwords must match')])
  
      name = TextField('이름', validators=[DataRequired(), Length(min=1, max=25)])
  
      def __init__(self, *args, **kwargs):
          super(RegisterForm, self).__init__(*args, **kwargs)
          self.user = None
  
      def validate(self):
          initial_validation = super(RegisterForm, self).validate()
          if not initial_validation:
              return False
          user = User.query.filter_by(username=self.username.data).first()
          if user:
              self.username.errors.append("Username already registered")
              return False
          user = User.query.filter_by(email=self.email.data).first()
          if user:
              self.email.errors.append("Email already registered")
              return False
          return True
subject: remove family name