python - Unable to validate my app on Django -

i reading django documentation , created first app using command:

python manage.py startapp books 

and modified models.py file mentioned in book.

from django.db import models  class publisher(models.model):    name = models.charfield(max_length=30)    address = models.charfield(max_length=50)    city = models.charfield(max_length=60)    state_province = models.charfield(max_length=30)    country = models.charfield(max_length=50)    website = models.urlfield()  class author(models.model):    first_name = models.charfield(max_length=30)    last_name = models.charfield(max_length=40)    email = models.emailfield()  class book(models.model):    title = models.charfield(max_length=100)    authors = models.manytomanyfield(author)    publisher = models.foreignkey(publisher)    publication_date = models.datefield() 

then added newly created app 'books' installed_apps list in settings.py file. added 'mysite.books' list , python manage.py validate returned following error:

error: no module named books. 

i referred 1 of questions stackoverflow creating first app described on djangobook , tried implementing solution changing 'mysite.books' 'books'. now, when run python manage.py validate, following output:

unknown command: 'validate' type 'manage.py help' usage. 

you shouldn't use 'mysite.blablabla' on installed apps. use 'books'

installed_apps = (#'mysite.books',                    'books') 

then type on commend line:

python manage.py makemigrations python manage.py migrate 

it create model's tables on db.

in admin.py:

from django.contrib import admin .models import publisher, author, book admin.site.register(publisher) admin.site.register(author) admin.site.register(book) 

type on command line create admin account:

python manage.py createsuperuser 

then after filling superuser info type on command line

python manage.py runserver 

finally go on browser , login: http://127.0.0.1:8000/admin

you see models on admin page. hope helps. happy coding