makemigration for clean project

Using Django Mystery Errors
1

Hi all,
I created standard django project, i added standard app with name ‘authentication’, i changed DB config to postgreqsl, I have done inspect for read models from db and write into authentication>models.py, i added autentication to my installed app list, now i want to make migration but “source code string cannot contain null bytes error”

what should i do?

2

Copy and paste the complete traceback here

3

Traceback (most recent call last):
File “D:\Django\project\manage.py”, line 22, in
main()
File “D:\Django\project\manage.py”, line 18, in main
execute_from_command_line(sys.argv)
File “C:\Python311\Lib\site-packages\django\core\management_init_.py”, line 442, in execute_from_command_line
utility.execute()
File “C:\Python311\Lib\site-packages\django\core\management_init_.py”, line 416, in execute
django.setup()
File “C:\Python311\Lib\site-packages\django_init_.py”, line 24, in setup
apps.populate(settings.INSTALLED_APPS)
File “C:\Python311\Lib\site-packages\django\apps\registry.py”, line 116, in populate
app_config.import_models()
File “C:\Python311\Lib\site-packages\django\apps\config.py”, line 269, in import_models
self.models_module = import_module(models_module_name)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “C:\Python311\Lib\importlib_init_.py”, line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “”, line 1204, in _gcd_import
File “”, line 1176, in _find_and_load
File “”, line 1147, in _find_and_load_unlocked
File “”, line 690, in _load_unlocked
File “”, line 936, in exec_module
File “”, line 1074, in get_code
File “”, line 1004, in source_to_code
File “”, line 241, in _call_with_frames_removed
SyntaxError: source code string cannot contain null bytes

4

can you share your DB config

5

‘default’: {
‘ENGINE’: ‘django.db.backends.postgresql’,
‘NAME’: ‘old_database’,
‘USER’: ‘user1’,
‘PASSWORD’: ‘User124082023’,
‘HOST’: ‘localhost’,
‘PORT’: ‘5432’,
}

6

py manage.py inspectdb > authentication/models.py

worked fine.
Is that means the DB config is working?

7

Is this some old DB that you are using

8

only the name is this, it is postgreqsl 14, up and run

9

There seems to be a damaged source file that contain an invalid character.

10

thank you so much, but i just installed python + django

11

@addwebsolution isn’t referring to software you’ve installed, but to your project itself. That error you are getting is most frequently seen when a source code file has gotten corrupted somehow.

Since you have directed the output of an inspect command into your models.py file, that would be the file I would check.

12

thank you so much, i deleted my project, and created from first, also i checked without Inspect, the result was same,

13

I see you’re using Python 3.11. What version of Django are you using?

14

C:\Windows\System32>django-admin --version
4.2.4

15

How are you creating your project?

What precisely do you mean by:

16

1- django-admin startproject my_project_name
2- cd my_project_name
3- py manage.py startapp authentication
4- config DB… in setting.py file
5- python manage.py inspectdb > authentication/models.py
6- verify manually models with DB tables
7- add app (authentication) to installed apps in setting.py
8- python manage.py makemigrations >>> Error

17

I’m having the exactly same problem. Did you finally find a way to solve it?