Python Daily
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Question, Tips and Tricks, Best Practices on Python Programming Language
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Today is python birthday, what do you wish?

First message of Guido releasing python was the 20 February 1991 on alt.sources.
What would you like to wish for the 28y of python?

I would love to see no more 2.7 code around.

/r/Python
https://redd.it/asltnr
Anyway have any experience/tips converting a Flask app using Jinja templating to React?

I have a Flask app that heavily used Jinja templating. However, the issue that I am facing right now is that the app is a static webpage and I want to move over to a SPA in React. So the plan is get rid of all the jinja templating and convert all the jinja features I was using to React features. Does anyone here have any experience dealing with this transition?

/r/flask
https://redd.it/asrdrw
Deploying Flask app to Heroku failing.

I have a flask webapp which is working fine on localhost but due to some reason is not running on Heroku.

I'm assuming that something is wrong with my Procfile.

File structure :

├── hiring.csv
├── machine-learning-model.ipynb
├── Procfile
├── README.md
├── requirements.txt
└── src
├── __init__.py
├── model.pkl
├── __pycache__
│   └── app.cpython-36.pyc
├── static
│   └── style.css
└── templates
└── index.html

Procfile:

web: gunicorn src:app

Thank you

/r/flask
https://redd.it/asrwr8
Image Pixelator using Python

This is my first post so go easy on me lol.

I made a naive algorithm which pixelates a given image by calculating the average pixel value using PIL and opencv.It is very slow(duh!), took around 10-15 sec to process a 4k image.Please try it out and give me suggestions to do it better or faster.[https://github.com/k4rth33k/code\_bunker/blob/master/pixel.py](https://github.com/k4rth33k/code_bunker/blob/master/pixel.py)

​

/r/Python
https://redd.it/asrikj
Getting post data from ajax to python in flask

hey all, I have been working on this problem for far too long. I have asked many people and still it seems that I am not figuring it out. All I want to do is take the info from ajax and send it to python so I can manipulate it and put it in a db.

​

/working.html

[https://pastebin.com/9QjtMURU](https://pastebin.com/9QjtMURU)

​

/routes.py

[https://pastebin.com/suMJC5Xx](https://pastebin.com/suMJC5Xx)

​

console log

​

https://i.redd.it/njuq2ujvlsh21.png

edit: switched to paste bin because i did not know how to format code here

/r/flask
https://redd.it/asu5do
DRF Alternatives.

Hey there everyone. I've gotten quite used to the DRF + Front end framework (Vue) workflow over the past few months, and it's made me realize just how strong Django can be as a back end only solution. For anyone with more diverse experience, what are some alternatives you guys have used for building out DB's / API's that don't involve Django? Specifically in the JS world. Do they compare?

/r/django
https://redd.it/asqe1f
As promised - webcam to ascii in command line

There's this [cool project](https://www.reddit.com/r/Python/comments/amjko2/works_with_live_webcam_video_idea_u1991viet/) which takes in camera input and converts it in real time to ascii art. The only problem is that it renders to a Pygame window instead of command line. (It was thought that rendering in text would be too slow.) I made some changes so it uses curses to render to command line.

So [as promised](https://www.reddit.com/r/Python/comments/amjko2/works_with_live_webcam_video_idea_u1991viet/efoti7v/?context=3) I making a post here, complete with a [youtube demo](https://www.youtube.com/watch?v=M0DnibYHUkQ), some [junky code](https://gist.github.com/SamyBencherif/29a0a945cabff92a4b61d78a5fe072a5) for you to get started on, and a bunch of [dumb embedded links](https://www.reddit.com/r/Python/comments/aswvve/as_promised_webcam_to_ascii_in_command_line/).

​

Installation of dependencies. Copy paste this into your terminal:

python3 -m pip install opencv-python

​

/r/Python
https://redd.it/aswvve
Downloadable Python lessons for someone cut off from the world for three weeks

I will be onboard onboard a ship out to sea for three weeks and internet access will be limited to email. Are there any good Python books/lessons that I can download and study during my downtime while I am out? I have absolutely no programming background.

/r/Python
https://redd.it/asyr69
CMS For User-Generated Graphs

I’m working on a project that allows a user to create academic articles with user generated graphs. Theoretically, the user would add a csv or excel spreadsheet in their publication and a CMS like Wagtail or Django CMS would generate a graph using React or Chart.js. Is this currently possible in Django with a CMS?

/r/django
https://redd.it/at352k
html → mysql → flask → html

i'm trying to create an offline backup for this forum.. by using selenium to get all of the html from each post, put it into a mysql db, then redisplay the html when the post gets opened.. however when attempting the display the html is simply shows the html in [plain text](https://imgur.com/a/qDKQjVg), while if I copy the html and paste into an actual .html file and view it, everything [looks fine](https://imgur.com/a/KVoKb6S) (granted I don't have the css linked yet)

c.execute('SELECT * FROM posts WHERE post_id=%s', (post_id, ))
for i in c.fetchall():
title = i[0]
body = i[1]
return render_template('topic.html', body=body)

I also tried below, however it resulted in a `UnicodeEncodeError: 'ascii' codec can't encode character '\u2014' in position 426: ordinal not in range(128)` which after an hour of looking I still haven't found out why it actually errors out.. as .encoding('utf8') doesn't do anything..

return """


/r/flask
https://redd.it/at2p76
User-defined number of wtform forms

I need to be able generate a user defined number of forms for the user to input data into. I.E if the user wants 4 instances of this "thing" then they need 4 separate instances of the form on the page. Does anyone know how to achieve such a thing in flask using WTForms? Any help is appreciated!

/r/flask
https://redd.it/at7a4q
Model Setup Help - Data Upload

I am looking to create a model that contains a hierarchy of items (think of Country, State, City, Town, as an example). In the end I want users to be able to select these items from a drop-down while inputting other data to separate models. I'm new to django so please bear with me. In this case, would I just never pass a POST to this model, as users would never be required nor would I want them to add data to this table AND how would I initially get this table populated? From what I have gathered, I would use pgadmin (using postgres in this case) to upload the data from a csv, correct?

​

I have an additional question, related to models, but unrelated to the above. I can post in a new topic if that's preferred. Nevertheless, I'm confused (and I think it's the admin dashboard that is confusing me) with how my form submission will submit data to my database. I understand how it works but how would I go about iterating related fields based on a specific field's submissions? As a functionally similar concept, think of my app as

/r/djangolearning
https://redd.it/aspd3k