Is Django a popular choice for real-time applications like messaging apps?

Is Django with Channels a popular choice for real-time apps? I'm curious about building a messaging app and I'm wondering if Django is a good choice, compared to Node or Go.

/r/django
https://redd.it/bcm6gs

Real world projects recommendation for go to next level

I have some background in django: drf basics, models, forms etc etc. But my projects are just cruds and basic things, such as requests lib to call github apis and view some data about repos, wagtail for basic cms, such as site for articles.

But in the projects could have more complex things, such as: get the posta with more comments in the week, learn pillow to image manipulation etc.

but I do not know much more to learn than this, and I want something that is more than four or five lines of a slightly more complex queryset.

I try learn react for learn about auth with api in the front end, but js and react is not easy, and by fact that i'm not proficient in back-end, i'm learning more about django, python (i will read the fluent python in the next week too), and i need finish the sql/postsgres book and maybe learn mongodb. After some months, i will learn js using ydkjs books (really learn) .

I read about some companies looking for "backoffice", but I'm not quite sure what that is and how to build it. I also saw a vacancy needing to create a website

/r/django
https://redd.it/bcnj2u

Flask mobile friendly web app

Hi:)
Noob here.
I would like to know if its easy to trasnform a web app made with flask in a mobile friendly form...

What should I look for ?

/r/flask
https://redd.it/bcq26b

Scientific programming recommendations

Hello, does anyone have any book recommendations for learning scientific programming?

I've automated the very little I could at work with Python and now I want advance a bit further

​

Thanks!

​

p.s. I have a background in physics so anything related would be ideal.

/r/Python
https://redd.it/bcp2oe

Feedback requested: I released my first Python package to pypi. It makes reading and managing config files convenient.

[https://pypi.org/project/gconf/](https://pypi.org/project/gconf/)

It is a very small package, just 330 LoC, including tests. But I use it in almost all of my other projects because it makes using config files just a no-brainer. Currently only yaml-files are supported.

A few weeks ago, I decided to make it public.

Please let me know what you think and if you see ways to improve it! Thanks and have a great weekend.

/r/Python
https://redd.it/bcqnpb

Writing a command-line interface similar to ‘git’ in Python.
https://medium.com/@FelipeFaria/writing-a-command-line-interface-similar-to-git-in-python-1cabbb3a3e6e

/r/Python
https://redd.it/bcrzzu

Storing Data / Object State Between URL's in a User Session

I am working to make a machine learning model / simulation web app, but am still pretty new to Flask. The model and simulation is a multi-step process and I'm struggling with the best way to handle data sharing across different url's within a user session. The workflow consists of:

​

* route(/index): User enters basic inputs into a webform
* These inputs are combined with a database table (every session will use the same data here), a quick model is trained, and a custom dataset for the current user's simulation is returned.
* The user is also automatically redirected to route(/simulation)
* This step requires \~10-15 seconds
* The returned custom dataset is \~25MB

​

* route(/simulation): User enters different parameters into a new webform, which are combined with the custom dataset generated from the previous step and a simulation is run that returns the final result
* This process should be iterative. The webform input parameters will be constantly updated, but the custom dataset generated in the first step will stay constant.
* This process should be as fast as possible. The simulation itself takes 1-2 seconds if the custom

/r/flask
https://redd.it/bcx6uj

[Ask Flask] Background update of a global dictionary shared between requests

I need to update a configuration dictionary of service (uri) lookups (< 1k entries) in the background of a flask app.
What’s the most lightweight way to achieve this?

I would like to keep everything in process and I don’t want to make another network request to something external.

It doesn’t matter if a dirty read is performed from the dictionary as the app is fault tolerant and will retry.

/r/flask
https://redd.it/bcxr3f

Algorithmic trading in less than 100 lines of Python code
https://www.oreilly.com/learning/algorithmic-trading-in-less-than-100-lines-of-python-code

/r/Python
https://redd.it/bcsntk

Formset: Saving Unchanged data

Formsets only pass changed fields via request.post to the post form.
There are fields in the form which are not changed but I want to post to a model.
These are new posts to a model and not changes to existing data.

For example:

Class Name(models.Model):
first_name = models.CharField(max_length=25)
last_name = models.CharField(max_length=25)

class NameForm(ModelForm):
class Meta:
model = Name
fields = '__all__'

if the first name is changed but not the last name; Only the first_name will be passed as last_name was not changed.

Given this, the form will not save because it is not valid; it is missing the last_name.

I believe setting 'has_changed' = True for all form fields will work but I am unsure how to do this.

So how do I get all the form data so it will be valid?

Thanks

/r/django
https://redd.it/bcwvn4

How to implement Django query filter using with AND

I'm trying to find a more efficient way to retrieve data from the database. My scenario is that I want to get a bunch of posts from the Post model based on the condition that the post must have a particular tag and that the post belongs to a person I follow and if the post belongs to such a person I shoud only get their public posts. Along with that, I want all of my posts too for that tag and if they are my posts, then I should get all public and private posts. Currently, I've come up with this Post.objects.filter(tags\_\_field = tag, owner\_id\_\_in= user\_ids, privacy\_setting\_\_in= privacy\_options) How can I use the and condition to get the result I want?

/r/django
https://redd.it/bcyf6h

Dynaconf 2.0.0 is out! from dynaconf import settings
https://dev.to/rochacbruno/from-dynaconf-import-settings-2f8o

/r/flask
https://redd.it/bcftmh

I converted MIT’s OpenCourseWare ”learn python course” to a layout which views better on all devices

I had been working on a project to give more depth to a YouTube playlist by allowing other media such as documents and sites all from the web. It morphed into this and one of my first personal projects using it was with MIT’s OpenCourseWare site. It just groups the URL’s and streams them from the creator.

First is my version of the Python course

[My version - introduction to python programming](https://collectyv.com/Course/saaaaaaab)

And now, MIT’s version.

[MIT’s version - Python Programming Course ](https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-0001-introduction-to-computer-science-and-programming-in-python-fall-2016/)

/r/Python
https://redd.it/bcxtwm

Created a webapp that displays the bond-line structure of any chemical compound/molecule.

/r/Python
https://redd.it/bd355n

Feedback request: I published a 4-part series about python byte-code

[Part 1 - Intro](https://harpaz.wordpress.com/2018/09/15/python-byte-code-part-1-intro/)

[Part 2 - the Stack](https://harpaz.wordpress.com/2018/09/19/python-byte-code-part-2-the-stack/)

[Part 3 - Byte-code Tricks](https://harpaz.wordpress.com/2019/01/23/python-byte-code-part-3-byte-code-tricks/)

[Part 4 - Word-code Tricks](https://harpaz.wordpress.com/2019/04/13/python-byte-code-part-4-word-code-tricks/)

&#x200B;

I would like to hear your opinion!

Tips and advice are always welcome :)

Thanks!

/r/Python
https://redd.it/bctzdz

Did anyone took the Vue/Django Course and can recommend it?

[https://courses.djangowaves.com/](https://courses.djangowaves.com/)

&#x200B;

I'm curious. Anyone took it can tell me if its worth it? I've always had issues with authentication and only found tutorials on how to do toy/demo apps.

/r/django
https://redd.it/bd68qb

Can I get a link to the django Discord Server?

A few days ago I removed the django discord server from my list, and I cant seem to find it again online. I imagined this one was the biggest. It had over 100 people on.

/r/django
https://redd.it/bd6ykp

models.py reserved names; list of all (if using Postgres)?

Ran into an issue earlier today where I was getting a `TypeError` of `int object is not callable` error when trying to save a new entry in a model in the Django admin. Turns out it was because I was using `save` as a field name, ie:

```
save = models.SmallIntegerField(default=0)
```

The error referenced line 1091 of `/usr/local/lib/python3.5/dist-packages/django/contrib/admin/options.py`, which in Django 2.1 is:

```
def save_model(self, request, obj, form, change):
"""
Given a model instance save it to the database.
"""
obj.save()
```

So it appears the `save` field name was overriding the `obj.save()` call above?

I found this:
[Field Name Restrictions](https://docs.djangoproject.com/en/2.2/topics/db/models/#field-name-restrictions)

But is there a list of all the reserved / protected words in Django `models.py`?

/r/django
https://redd.it/bd6o7q

[project] Anyone else is playing with reddit comments using ML in cloud? I'm trying to predict assholes judging from their karma from comments.

Fun categorical classification project, I'd call it ass-o-meter. I queried 1M 2019_01 comments from gbq and running my model on Google colab.

/r/MachineLearning
https://redd.it/bd26o7

Getting SQLAlchemy database instance in Flask

First of all, I'm sorry if this is longish but I can't describe the situation without being explicit, please bear with me.

&#x200B;

I'm fairly new to flask and I'm building a simple blogging application and am quite confused of the whole application context thing but slowly grasping the concept of it, I want to know what is the better way of doing this which doesn't have any drawbacks. There are 'blog' and 'admin' blueprints for viewing and editing/adding/deleting blogs, respectively. Project layout is something like this:

&#x200B;

main.py
config.cfg
database.db
blueprints/
--------admin/
------------__init__.py
------------routes.py
--------blog/
------------__init__.py
------------models.py
------------routes.py

I'm going to add another blueprint for 'user' objects and neatly organize everything in django-esque manner, because of this there are no references to main \`app\` object in \`blog.models\` because I don't think it's a good practice to import and define \`SQLAlchemy\` object in every \`models.py\` there might be in future, instead I'm using \`db.init\_app(app)\`

&#x200B;

This is \`main.py\` file:

from flask import Flask



/r/flask
https://redd.it/bd6g85