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Line 4 of your admin.py is
from admin.site.register(Post)
This is a Python syntax error. It should be simply
admin.site.register(Post)
which calls the appropriate method to register your Post class with Django’s admin site.
Incidentally, the from keyword in Python is used to import something into your current module. You should make sure you have the line
from django.contrib import admin
somewhere in lines 1 through 3 of admin.py (probably line 1!), to make sure admin is defined correctly by the time you get to line 4.
Source:stackexchange.com