Customize username and password field in Django? -

first, how can set min_length username? chachauser._meta.get_field('username').min_length = 2 doesn't work.

second, how can place placeholder password1 , password2? forms.passwordinput(attrs={'placeholder' : "6자리 이상"}), doesn't work.

this customized user model , usercreationform.

models.py

from django.core.validators import regexvalidator django.contrib.auth.models import abstractuser django.db import models   gender_choices = (     ('m', '남'),     ('f', '여'), )  phone_regex = regexvalidator(     regex=r'^\d{11}$',     message=" '-' 없이 입력해주세요", )  username_regex = regexvalidator(     regex=r'^[0-9a-za-z]*$',     message='아이디는 영어와 숫자로만 구성되어야 합니다.' )    class chachauser(abstractuser):      birth = models.datefield("생년월일")     name = models.charfield(         "이 름",         max_length=4     )     gender = models.charfield(         "성 별",         max_length=1,         choices=gender_choices,         default='m'     )      phone_number = models.charfield(         "핸드폰",         validators=[phone_regex],         max_length=11     )      job = models.charfield(         "직 업",         max_length=20,     )      # python manage.py createsuperuser 할 때 나오는 항목     required_fields = [         'birth',         'name',         'gender',         'phone_number',         'job',         'email'     ]  chachauser._meta.get_field('username').verbose_name = '아이디' chachauser._meta.get_field('username').validators = [username_regex] chachauser._meta.get_field('username').max_length = 20 chachauser._meta.get_field('username').min_length = 2 

forms.py

from django import forms django.contrib.auth.forms import usercreationform django.contrib.auth import get_user_model   class myusercreationform(usercreationform):      birth = forms.datefield(         label="생년월일",         widget=forms.selectdatewidget(             years=range(1970, 2015)         ),     )      class meta(usercreationform.meta):         model = get_user_model()         fields = usercreationform.meta.fields + (             'name',             'gender',             'birth',             'phone_number',             'job',         )         exclude = ('email', )         widgets = {             'username' : forms.textinput(                 attrs={'placeholder': '알파벳, 숫자만 가능(20자 이내)'}             ),             'phone_number' : forms.textinput(                 attrs={'placeholder' : "ex) 01012341234"}             ),             'job' : forms.textinput(                 attrs={'placeholder' : "ex) 한국대 철학과, 선생님 등(20자 이내)"}             ),             'password1' : forms.passwordinput(                 attrs={'placeholder' : "6자리 이상"}             ),             'password2' : forms.passwordinput(                 attrs={'placeholder' : "6자리 이상"}             ),         } 

for first question:

from django.core import validators     class chachauser(abstractuser):     ..................     abstractuser._meta.get_field('username').validators=[validators.minlengthvalidator(2)] 

for second question couldn't change password1 in meta.widgets because not model field. can override widget in __init__ method instead.