How to: Django development and debugging

[Don Thilaka Jayamanne]

Hi Everyone, I'm the author of a Python plugin for the VS Code editor (https://github.com/DonJayamanne/pythonVSCode). Basically it provides intellisense, code navigation, debugging (django, multi threads, etc), data science and the like.

When it comes to debugging django applications, today the extension disables (doesn't support) live reloading of django applications.

I'm thinking of having a look at this particular area. Before I do so, I'd like to get an idea of how developers actually develop and debug django applications.

Most of the people i've spoken to say they develop as follows:

- Fire up the django application with live reload 

- Start codeing

- Test in the browser

- Very rarely would they debug an application

- i.e. majority of the time they don't launch the application in debug mode 

How do you work on django applications?

[Antonis Christofides]

- Very rarely would they debug an application

- i.e. majority of the time they don't launch the application in debug mode 

By "debug mode" I guess you mean stepping into the code, stopping at breakpoints, etc. I wouldn't say I do it rarely, I do it quite often. I add "import ipdb; ipdb.set_trace()" in the code, at the place I want it to stop, and then I can step and so on. It sucks when you compare it to great debuggers (I have experience in Delphi and I'm missing the debugger much when I program in Python), but it's better than nothing. I've heard PyCharm's decent in that, but I haven't tried it (yet).

Antonis Christofides
http://djangodeployment.com

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[Muizudeen Kusimo]

Hello Folks,

PyCharm makes debugging Django (and other Python) applications very easy. Some of the features which are very helpful include:

1. Ability to choose specific Python Interpreter you want to run the code base against. Useful if you use virtualenv and need to test your code in different Python versions
2. Standard debugging tools - Step Into, Step Over, Step Out, Watches
3. Support for debugging other Python libraries tied to your Django application e.g. Lettuce BDD tests, Unit Tests e.t.c

It's definitely worth a try as you can get a lot from the Community Edition

Regards

[Mike Dewhirst]

On Thursday, October 20, 2016 at 8:30:45 PM UTC-4, Don Thilaka Jayamanne
wrote:
>
> Hi Everyone, I'm the author of a Python plugin for the VS Code
> editor (https://github.com/DonJayamanne/pythonVSCode

> <https://github.com/DonJayamanne/pythonVSCode>). Basically it

> provides intellisense, code navigation, debugging (django, multi
> threads, etc), data science and the like.
>
> When it comes to debugging django applications, today the
> extension disables (doesn't support) live reloading of django
> applications.
>

I take this to mean reload the dev server when code changes. I think
that is critical for development.
Also critical for me is the debug page delivered when settings.DEBUG is
True. I suppose that is independent of the IDE.

>
> I'm thinking of having a look at this particular area. Before I do
> so, I'd like to get an idea of how developers actually develop and
> debug django applications.
>
> Most of the people i've spoken to say they develop as follows:

> - Fire up the django application with live reloadÂ
>

No. I write a unit test (or tests) then do manage.py test
Assuming the tests fail I start coding
>
> - Start codeing
>

When the unit tests all pass

> - Test in the browser
>

Yes

>
> - Very rarely would they debug an application
>

Very rarely necessary to step through code looking at variables etc to
discover why something isn't working. My bugs are pretty obvious. I have
stepped through code but usually to see what the framework is doing for
one reason or another.

> - i.e. majority of the time they don't launch the application in

> debug modeÂ
>

Always in development

Very rarely in staging and then only temporarily to see what is going
wrong on the non-dev platform.

Never in production (same platform as staging)

>
> How do you work on django applications?
>

* Plain text editor with Python syntax highlighting to write code
* Scripted launching of manage.py with different backends, settings,
databases as required
* Commit to my own branch in svn
* Merge to trunk
* Run unit tests
* Repeat until all unit tests are working
* Commit trunk in svn
* Svn commences a Buildbot deployment on staging which succeeds if the
tests all work
* Occasionally create a production tag from trunk in svn
* Manually edit a script on production to deploy the tag

HTH

Mike

[Don Thilaka Jayamanne]

The debugger in python extension for VS Code is comparable to PyCharms debugger. In fact it supports all of the features you have mentioned.

Please feel free to try it out:

- https://marketplace.visualstudio.com/items?itemName=donjayamanne.python

- https://github.com/DonJayamanne/pythonVSCode/wiki/Debugging

[Derek]

Is VS Code Editor available on Linux platforms?

[Luis Zárate]

I rarelly debug code with django, with external utility, just trace stack when errors appears, buy when I need it I use pydev over Aptana,  it has heap monitor, breakpoints, step by step run and other debugger functions.

One important thing is that I need to say to pydev that  run django with --no-autoreload parameter, so then works well because when I am debugging I am not coding and I can start or stop the server when I want.

I always run django in external terminal when I am coding, I really like the autoreload, I think it's better if the IDE can reload, but I really hate when Aptana is configured wrong and server never die, because I need to user $ killall python (or some like that) to stop django.

I dislike VS as IDE but, great if you want to support Django there.

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[Don Thilaka Jayamanne]

@Derek, yes VS Code Editor is available on Linux platforms.

Have a look here:

https://code.visualstudio.com/Download

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[Don Thilaka Jayamanne]

@Luis Zárate 

>I dislike VS as IDE but

Any particular reason for this?

>great if you want to support Django there

Django is supported today (including template debugging). Right now i'm looking at the need for debugging with auto-reload.

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[Don Thilaka Jayamanne]

@Derek, yes VS Code Editor is available on Linux platforms.

Have a look here:

https://code.visualstudio.com/Download

[Don Thilaka Jayamanne]

@Luis Zárate 

>I dislike VS as IDE but

Please remember, this is Visual Studio Code (cross platform, open source, free) and not to be confused with Visual Sutdio IDE (full blown IDE runs only on Windows)

Visual Studio Code

>great if you want to support Django there

Django is supported today (including template debugging). Right now i'm looking at the need for debugging with auto-reload.

Check here for Python Extension and Features

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[Don Thilaka Jayamanne]

Hi ,

This Python Extension too supports the features you have mentioned.

The difference is:

- Visual Studio Code is more of a lightweight and cross platform alternative (completely open source - MIT licensed).

Here are some of the features:

• Linting (Prospector, Pylint, pycodestyle/Pep8, Flake8, pydocstyle with config files and plugins)
• Intellisense (autocompletion)
• Scientific tools (Jupyter/IPython)
• Auto indenting
• Code formatting (autopep8, yapf, with config files)
• Code refactoring (Rename, Extract Variable, Extract Method, Sort Imports)
• Viewing references, code navigation, view signature
• Excellent debugging support (remote debugging, mutliple threads, django, flask, docker)
• Unit testing, including debugging (unittest, pytest, nosetests, with config files)
• Execute file or code in a python terminal
• Local help file (offline documentation)
• Snippets

On Saturday, 22 October 2016 05:56:43 UTC+11, Muizudeen Kusimo wrote:

[Luis Zárate]

2016-10-23 17:08 GMT-06:00 Don Thilaka Jayamanne <don.ja...@gmail.com>:

@Luis Zárate 

>I dislike VS as IDE but

Please remember, this is Visual Studio Code (cross platform, open source, free) and not to be confused with Visual Sutdio IDE (full blown IDE runs only on Windows)

Visual Studio Code

Sorry I was confused, I was thinking in Microsoft Visual Studio (MVS).

I didn't test VSC, but I will.  I am looking for a IDE because Aptana is not updated for a while, so I am having compatibility issues.

33 Mb size it's like i want :) great for Debian installer.

It's any relation with MVS? because you are using the same icon and the same colors.

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