Develop Reference

Flask doesn't seem to recognize file changes

A little background:
I've been working on this project for about six months now and it's been running on Flask the whole time. Everything has been fine, multiple versions of the backend have been deployed live to support an app that's been in production for months now.
The development cycle involves writing everything locally and using Flask-Script's runserver command to test everything locally on localhost:8080 before deploying to a dev server and then finally to the live server.
The Problem: The other day my local flask instance, which runs on localhost:8080 apparently stopped respecting my local files.
I tried adding a new view (with a new template) and I got a 404 error when trying to view it in my browser.
I then tried making some test changes to one of the existing pages by adding a few extra words to the title. I restarted flask and none of those changes appeared.
I then went as far as deleting the entire views.py file. After restarting flask again, much to my dismay, I could still view the pages that were there originally (i.e. before this behavior started).
Finally, I made some changes to the manage.py file, which is where I put all of the Flask-Script commands, and they weren't recognized either. It's as if flask started reading from a cached version of the filesystem that won't update (which very well might be the case but I have no idea why it started doing this or how to fix the issue).
FYI: Browser caching shouldn't be an issue b/c I have the dev tools open with caching disabled. Plus the fact that changes to manage.py aren't being noticed shouldn't have anything to do with the browser.

You've most likely used flask in the DEBUG mode in which it auto reloads templates the app whenever a file changes.
Try using
export FLASK_DEBUG=True
before running
flask run
For more information see http://flask.pocoo.org/docs/1.0/config/#DEBUG

I was having a similar issue and deleting the .pyc files solved it for me.

How to Access URL of Localhost Django Project - Page Not Found

I transferred my Django project from a Ubuntu server that is currently serving the website. I'm trying to run this project on a localhost MacOSX environment for testing purposes. The command I'm familiar with for Django projects is:
python manage.py runserver
After which when I input 127.0.0.1:8000 into a browser, the project displays.
But my Ubuntu server is not currently running a script in that form, rather in the form of
python manage.py celeryd
My knowledge of how celery interfaces with Django is somewhat limited so this question may be very basic, but I can't find the URL to display the project.
On my Mac server, when I run:
python manage.py celeryd
the script does not error out on me--instead, it appears to be working by displaying this:
However, I don't know how to access the project. When I put 127.0.0.1 in the browser (and many other possible variations using different ports), I get Page Not Found.
Any help is greatly appreciated.

First you need to define 'core' template tag in one of your apps templatetags library say custom_tags.py. Make sure that this app is added to INSTALLED_APPS in settings. Then in your html template add
{% load custom_tags %}
It will fix the error you are getting. For more details please read docs.

You seem confused about what celery is. It is not a webserver, and it won't serve pages for you. It is an offline task manager, useful for performing complex or long running jobs that aren't appropriate to do in the context of a web request.
You'll need an actual web server alongside celery to serve your site itself.

Herkou site looks different at launch then django local server site

My issue is that when I view my site using python manage.py runserver or foreman start, I can see my site perfectly.
However, when I git push heroku master on the surface everything appears fine as no errors are given. But when I view my site with the Heroku given site link, I do not see my updated site as I see when I view my site using python manage.py runserver or foreman start.
I am building my site using 'pinax-theme-bootstrap` and my virtualenv is on my desktop directory.
Does anyone have a solution as to why this may be the case?

Here is a list of suggestions on how I would approach this issue with Heroku.
You should try heroku restart. This restarts your application and can help pick up new changes.
I would clear my browser cache as often I do not see changes on my web page if the browser has cached them.
I would check that the git repository on Heroku matches my local one in that it has all the newest changes made on my local server.

Django project using wrong (old) database settings

recently I started a small Django project that I developed on a local machine using a SQLite3 database and the integrated development server. I now copied the whole project to a server running Debian.
Everything worked well as long as I kept using the SQLite3 database. Now I wanted to switch to a local MySQL database, so I changed the settings.py file in my project's root folder, created the database and added a user. I then ran syncdb and it created the needed tables without any problems.
Now I wanted to use the app, but I keep getting errors, because Django can not find the tables - neither the 'standard tables' like django_sessions nor my own tables - even though they are there (I checked the database).
The one thing that seems awkward about the DatabaseError pages I get is the following line:
Exception Location: /usr/local/lib/python2.6/dist-packages/django/db/backends/sqlite3/base.py in execute, line 234
It seems like Django is still using the SQLite3 backend even though I set it to use the MySQL backend.
The other thing that nearly makes me freak out is this: I deleted the data.sqlite file in my app's root folder using rm. But when I use my app, the file is being recreated!
Can anyone tell me where I went wrong?

When running in production with mod_wsgi or mod_python, new code isn't incorporated until you reload/restart the webserver.
If you are using apache with mod_wsgi, you can also touch the wsgi.py file to restart the python code only.

If running on apache run "sudo /etc/init.d/apache2 reload" everytime you make a change.

Installing django on dreamhost (help a newb out)

I'm trying to get django running on my dreahost account. I've been trying to sort of use two tutorials at once: the one on the dreamhost wiki and the one in the django book.
I installed django using the script on the wiki page, but I ran into trouble immediately while trying to work through the django book. It says:
To start the server, change into your project directory (cd mysite), if you haven’t already, and run this command:
python manage.py runserver
This launches the server locally, on port 8000, accessible only to connections from your own computer. Now that it’s running, visit 127.0.0.1:8000 with your Web browser. You’ll see a “Welcome to Django” page shaded in a pleasant pastel blue. It worked!
Those instructions seem to assume that you're developing locally, not on a shared server. Where the heck am I supposed to look for the "Welcome to Django" page after starting the server? In my webroot? No dice.
Anyway, I tried to blunder ahead through the django book to its hello world tutorial (chapter 3). But once I've edited the view file and the URLconf, I don't get a nice clean "hello world" text. Instead (as you can see) I get an "import error".
Any help would be greatly appreciated.

Don't try and learn Django via your server. Install it on your local computer, learn how it works, develop your project, and then install it on Dreamhost.

Your project assumes that 1) your app is called "mysite", and 2) mysite is a package, e.g. mysite/__init__.py exists. If either of those are false then correct your code and/or file structure.

This is an old post and am sure you have found the answer by now. I have solved this problem by using the command
python manage.py runserver mydomain.com:8080