Psycopg will not work

Traceback (most recent call last):
  File "/code/manage.py", line 22, in <module>
    main()
  File "/code/manage.py", line 18, in main
    execute_from_command_line(sys.argv)
  File "/usr/local/lib/python3.10/site-packages/django/core/management/__init__.py", line 442, in execute_from_command_line
    utility.execute()
  File "/usr/local/lib/python3.10/site-packages/django/core/management/__init__.py", line 416, in execute
    django.setup()
  File "/usr/local/lib/python3.10/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/usr/local/lib/python3.10/site-packages/django/apps/registry.py", line 116, in populate
    app_config.import_models()
  File "/usr/local/lib/python3.10/site-packages/django/apps/config.py", line 269, in import_models
    self.models_module = import_module(models_module_name)
  File "/usr/local/lib/python3.10/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 883, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/usr/local/lib/python3.10/site-packages/django/contrib/auth/models.py", line 3, in <module>
    from django.contrib.auth.base_user import AbstractBaseUser, BaseUserManager
  File "/usr/local/lib/python3.10/site-packages/django/contrib/auth/base_user.py", line 58, in <module>
    class AbstractBaseUser(models.Model):
  File "/usr/local/lib/python3.10/site-packages/django/db/models/base.py", line 143, in __new__
    new_class.add_to_class("_meta", Options(meta, app_label))
  File "/usr/local/lib/python3.10/site-packages/django/db/models/base.py", line 371, in add_to_class
    value.contribute_to_class(cls, name)
  File "/usr/local/lib/python3.10/site-packages/django/db/models/options.py", line 243, in contribute_to_class
    self.db_table, connection.ops.max_name_length()
  File "/usr/local/lib/python3.10/site-packages/django/utils/connection.py", line 15, in __getattr__
    return getattr(self._connections[self._alias], item)
  File "/usr/local/lib/python3.10/site-packages/django/utils/connection.py", line 62, in __getitem__
    conn = self.create_connection(alias)
  File "/usr/local/lib/python3.10/site-packages/django/db/utils.py", line 193, in create_connection
    backend = load_backend(db["ENGINE"])
  File "/usr/local/lib/python3.10/site-packages/django/db/utils.py", line 113, in load_backend
    return import_module("%s.base" % backend_name)
  File "/usr/local/lib/python3.10/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "/usr/local/lib/python3.10/site-packages/django/db/backends/postgresql/base.py", line 29, in <module>
    raise ImproperlyConfigured("Error loading psycopg2 or psycopg module")
django.core.exceptions.ImproperlyConfigured: Error loading psycopg2 or psycopg module
(project_env) andrewstribling@Andrews-MBP ch4-bookstore % pip list
Package           Version
----------------- -------
asgiref           3.7.2
Django            5.0
pip               23.2.1
psycopg           3.1.16
psycopg-binary    3.1.16
setuptools        65.5.0
sqlparse          0.4.4
typing_extensions 4.9.0

[notice] A new release of pip is available: 23.2.1 -> 23.3.2
[notice] To update, run: pip install --upgrade pip

What have I tried and what am I expecting.

I have tried to uninstall psycopg[binary] and uninstall django. Than I have tried to reinstall using pip install psycopg, pip install psycopg[binary, pip install psycopg2[binary] and of course pip install django.

I have checked the psycopg documentation and I am in line with what they ask for as well as stack overflow.

Please assist as I really need to be making progress on django soon.

The relevant part of the backtrace seems to be missing. Which Linux distribution is this? In Fedora/CentOS you would need to install libpq-devel first. Then, I would delete that virtual environment and do the following:

$ sudo dnf install libpq-devel
$ python -m venv venv
$ source venv/bin/activate
$ (venv) pip install psycopg2
$ (venv) pip install django

I have not tried psycopg (version 3) yet

Hi,
as i’ve stated on discord to you i’m quite sure you’re using the slim version of the python debian docker image. That version is neither recommended (by docker), nor does it have all libraries for making psycopg3 work as far as i know.

Give the regular release a go, and i’m sure the problem will be solved :slight_smile:

Best regards
JaK

JaK I am new to docker. I am planning on taking the acloud guru course to increase my knowledge. in the meantime could you explain how I would set it to the regular version?

In your Dockerfile, right at the top there is a FROM clause, after that it mentions the image name, and its tag, just remove the -slim from the tag and you’re off to the races :stuck_out_tongue:

that seems to have worked!

Thank you JaK!

How can I better understand the dockerfile and diagnose what is wrong so that I may debug? I am thinking using the docker docs and selecting the individual hyperlinks for each part of the docker file such as the FROM to learn the syntax. Is this the right way to understand the parts or is there a better resource out there that you recommend?

Hi,
I have the same issue as you.
I’m not usind Docker.
I’m working on ubuntu 22.04 with a virtual environnement.
I’m using Django 5 with python 3.12 and psycopg 3
I have tried to install and uninstall psycopg and django.
I have tried many solutions that I have seen on the web but nothing work for me and I really need to use django soon.
Please, could someone help me? I’ll be very grateful

(momo) momo@momo-NL40-50CU:~/Documents/webdjango/djoenv/momo$ python manage.py runserver
Watching for file changes with StatReloader
Exception in thread django-main-thread:
Traceback (most recent call last):
  File "/home/momo/Documents/webdjango/djoenv/momo/lib/python3.12/site-packages/django/db/backends/postgresql/base.py", line 25, in <module>
    import psycopg as Database
  File "/home/momo/Documents/webdjango/djoenv/momo/lib/python3.12/site-packages/psycopg/__init__.py", line 9, in <module>
    from . import pq  # noqa: F401 import early to stabilize side effects
    ^^^^^^^^^^^^^^^^
  File "/home/momo/Documents/webdjango/djoenv/momo/lib/python3.12/site-packages/psycopg/pq/__init__.py", line 17, in <module>
    from .misc import ConninfoOption, PGnotify, PGresAttDesc
  File "/home/momo/Documents/webdjango/djoenv/momo/lib/python3.12/site-packages/psycopg/pq/misc.py", line 10, in <module>
    import ctypes.util
  File "/usr/local/lib/python3.12/ctypes/__init__.py", line 8, in <module>
    from _ctypes import Union, Structure, Array
ModuleNotFoundError: No module named '_ctypes'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/momo/Documents/webdjango/djoenv/momo/lib/python3.12/site-packages/django/db/backends/postgresql/base.py", line 27, in <module>
    import psycopg2 as Database
ModuleNotFoundError: No module named 'psycopg2'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.12/threading.py", line 1073, in _bootstrap_inner
    self.run()
  File "/usr/local/lib/python3.12/threading.py", line 1010, in run
    self._target(*self._args, **self._kwargs)
  File "/home/momo/Documents/webdjango/djoenv/momo/lib/python3.12/site-packages/django/utils/autoreload.py", line 64, in wrapper
    fn(*args, **kwargs)
  File "/home/momo/Documents/webdjango/djoenv/momo/lib/python3.12/site-packages/django/core/management/commands/runserver.py", line 125, in inner_run
    autoreload.raise_last_exception()
  File "/home/momo/Documents/webdjango/djoenv/momo/lib/python3.12/site-packages/django/utils/autoreload.py", line 87, in raise_last_exception
    raise _exception[1]
  File "/home/momo/Documents/webdjango/djoenv/momo/lib/python3.12/site-packages/django/core/management/__init__.py", line 394, in execute
    autoreload.check_errors(django.setup)()
  File "/home/momo/Documents/webdjango/djoenv/momo/lib/python3.12/site-packages/django/utils/autoreload.py", line 64, in wrapper
    fn(*args, **kwargs)
  File "/home/momo/Documents/webdjango/djoenv/momo/lib/python3.12/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/home/momo/Documents/webdjango/djoenv/momo/lib/python3.12/site-packages/django/apps/registry.py", line 116, in populate
    app_config.import_models()
  File "/home/momo/Documents/webdjango/djoenv/momo/lib/python3.12/site-packages/django/apps/config.py", line 269, in import_models
    self.models_module = import_module(models_module_name)
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/importlib/__init__.py", line 90, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap>", line 1387, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1360, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1331, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 935, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 994, in exec_module
  File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
  File "/home/momo/Documents/webdjango/djoenv/momo/lib/python3.12/site-packages/django/contrib/auth/models.py", line 3, in <module>
    from django.contrib.auth.base_user import AbstractBaseUser, BaseUserManager
  File "/home/momo/Documents/webdjango/djoenv/momo/lib/python3.12/site-packages/django/contrib/auth/base_user.py", line 58, in <module>
    class AbstractBaseUser(models.Model):
  File "/home/momo/Documents/webdjango/djoenv/momo/lib/python3.12/site-packages/django/db/models/base.py", line 143, in __new__
    new_class.add_to_class("_meta", Options(meta, app_label))
  File "/home/momo/Documents/webdjango/djoenv/momo/lib/python3.12/site-packages/django/db/models/base.py", line 371, in add_to_class
    value.contribute_to_class(cls, name)
  File "/home/momo/Documents/webdjango/djoenv/momo/lib/python3.12/site-packages/django/db/models/options.py", line 243, in contribute_to_class
    self.db_table, connection.ops.max_name_length()
                   ^^^^^^^^^^^^^^
  File "/home/momo/Documents/webdjango/djoenv/momo/lib/python3.12/site-packages/django/utils/connection.py", line 15, in __getattr__
    return getattr(self._connections[self._alias], item)
                   ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^
  File "/home/momo/Documents/webdjango/djoenv/momo/lib/python3.12/site-packages/django/utils/connection.py", line 62, in __getitem__
    conn = self.create_connection(alias)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/momo/Documents/webdjango/djoenv/momo/lib/python3.12/site-packages/django/db/utils.py", line 193, in create_connection
    backend = load_backend(db["ENGINE"])
              ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/momo/Documents/webdjango/djoenv/momo/lib/python3.12/site-packages/django/db/utils.py", line 113, in load_backend
    return import_module("%s.base" % backend_name)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/importlib/__init__.py", line 90, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/momo/Documents/webdjango/djoenv/momo/lib/python3.12/site-packages/django/db/backends/postgresql/base.py", line 29, in <module>
    raise ImproperlyConfigured("Error loading psycopg2 or psycopg module")
django.core.exceptions.ImproperlyConfigured: Error loading psycopg2 or psycopg module
^Z
[1]+  Arrêté                python manage.py runserver
(momo) momo@momo-NL40-50CU:~/Documents/webdjango/djoenv/momo$ pip freeze
asgiref==3.7.2
Django==5.0.1
psycopg==3.1.16
psycopg-binary==3.1.16
sqlparse==0.4.4
typing_extensions==4.9.0
wheel==0.42.0

Hi mangeniol,

I know your question is old, but I just had the same issue. I downgraded to python 3.11 instead of 3.12 and the error went away. Hope that helps you (or someone else!).

Hi,

Thanks for your message, I will try :crossed_fingers: