Re: How to use Django 1.8.2 with Python 2.7?

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Hi,

On 08/11/2015 11:56 AM, jsachs@nvidia.com wrote:
> I'm studying the Django Project tutorial
> <https://docs.djangoproject.com/en/1.8/intro/tutorial01/> using Python
> 2.7 (because that's my department's current standard) and Django 1.8.2
> (because that's the current stable version).
>
> The tutorial says, "If you are still using Python 2.7, you will need to
> adjust the code samples slightly, as described in comments." What
> comments does it mean?

Python code comments, in the code samples that need adjusting. The first
example I see is in the `polls/models.py` code sample in this section:
https://docs.djangoproject.com/en/1.8/intro/tutorial01/#playing-with-the-api

See the "__unicode__ on Python 2" comments?

> The section "Playing with the API" instructs me to run the command:
>
> $ python manage.py shell
> or
>>>> import django
>>>> django.setup()
>
> Being a methodical sort, I tried both. The first works. The second gives
> me a bunch of errors, beginning with:
>
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File "c:\Python27\lib\site-packages\django\__init__.py", line 17, in setup
> configure_logging(settings.LOGGING_CONFIG, settings.LOGGING)
>
> I think it's complaining about an incompatibility between Python 2.7 and
> Python 3.2.

Can't say without seeing more of the traceback. I doubt it though, since
this only executes code in Django itself, which is fully compatible with
both Python 2 and 3.

> I can evade the immediate problem by using "python manage.py shell"
> instead, but I expect further problems in short order, and I need to
> know how to fix them.
>
> So, where are these "comments" that tell me what to do? I don't see any
> in that part of the tutorial. I opened __init__.py, and there are no
> helpful comments there, either.

You don't need to adjust anything at all in Django itself to adapt to
Python 2; Django fully supports both 2 and 3. You just need to make sure
that the code you write yourself is Python 2 compatible. Where the
tutorial tells you to type some code in a file, it gives the Python 3
version, but has comments showing what needs to be adjusted for Python
2. There's nothing special you need to do until you get to those code
samples.

> I could figure this out myself, but I can't see debugging my way through
> the entire Django codebase. I'm being paid to write an application, not
> fix up Django.

You don't need to fix up Django.

> Either I'm missing the comments that the tutorial promised me, or it has
> left me in the lurch. Can someone explain, please?

Just continue with the tutorial, and read the code samples (including
comments) carefully, when you reach them.

Your issue when running `django.setup()` is probably entirely unrelated,
but in order to debug it we'd need to see the full traceback.

Carl

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