Looking for help with a process.

I have a variable in the form:

y = m[i]*t + b[i]

where I have values for m and b stored in lists. I'm interested in using a loop (or any other suggestion) to have the variable expand, similar to a summation.

y = m[0]*t + b[0] + m[1]*t + b[1] + ... + m[n]*t + b[n]

I would like to have the code accomplish the expansion for me as the goal is to have the number n determined by a user. It's similar to Fourier coefficients.

I greatly appreciate any tips, help or suggestions in this matter. Sorry if I committed any faux-pas up to this point as well.

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

How a production ready Dockerfile for Django projcet should look like?

It is clear that Docker is a buzzword for developers and I want to use it for my Django projects. The problem is that I can't find any material to learn how to correctly write a production ready Dockerfile for a Django project. Almost in every tutorial I see something like this in Dockerfile they write: **command: bash -c "python manage.py makemigrations && python manage.py migrate && python manage.py runserver 0.0.0.0:8000"**

And they call it "Production ready Dockerfile". What the f\*ck?! You don't run your server with [manage.py](https://manage.py) runserver command in production. Who the hell does?! I am freaking out that how it is possible that everyone loves Docker, everyone uses it, but no one teaches it correctly. So I need your help people to, get out this f\*cking situation. Thanks in advance.

/r/django
https://redd.it/aobpp8

Gita: a command-line tool to manage multiple repositories

I wrote a command-line tool to manage multiple repositories called [gita](https://github.com/nosarthur/gita). It can do two things

* display the status of multiple git repos such as branch, modification, commit message side by side
* delegate git commands/aliases from any working directory

[screenshot](https://raw.githubusercontent.com/nosarthur/gita/master/screenshot.png)

The color coding represents the relationship between local and remote branches, and the extra symbols (+, \*, and \_) denote the dirtyness of edits.

To install, simply run `pip3 install -U gita`

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

Flask has overtaken Django according to the 2018 JetBrains Developer Survey
https://www.reddit.com/r/Python/comments/ao5dml/flask_has_overtaken_django_according_to_the_2018/

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

IntegrityError: Duplicate Primary Key issue with postgres

Hi,

The database has a few entries that were removed which leaves a gap in the Primary Keys. When testing backup and restore on my dev server, the Primary Key was reset to 1, fine, this is to be expected. However, running:

python manage.py sqlsequencereset microblog

Resets it to the next free number, This is no good, as the ID sequence in the current test db is:

1,2,7,10,12,13,14,17,23,24,25,26

so resetting to 3, just means this will fail in 4 database entries time. I have also tried:

psql
SELECT setval('microblog_blog_id_seq', (SELECT MAX(id) FROM microblog_blog)+1);

Whilst it returns the correct number in the console, and I am able to add another post, looking at the database table in pgAdmin, shows that it has picked the number 3 again, not 27 which is what I want it to do. Literally, I want it to treat any number < max as a no go value.

How can I do this? and if anyone knows why this is not the default behaviour I would be interested to know the reason why?

&#x200B;

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

Django-Channels: DLL load failed: %1 is not a valid Win32 application

Hi All!

After adding channels app on my project, I started having this error when running [manage.py](https://manage.py) runserver:

&#x200B;

\---------------------------------------------------------------------------------

File "D:\\Python37\\lib\\site-packages\\channels\\[apps.py](https://apps.py)", line 6, in <module>

import daphne.server

File "D:\\Python37\\lib\\site-packages\\daphne\\[server.py](https://server.py)", line 27, in <module>

from twisted.internet.endpoints import serverFromString

File "C:\\Users\\...\\AppData\\Roaming\\Python\\Python37\\site-packages\\twisted\\internet\\[endpoints.py](https://endpoints.py)", line 41, in <module>

from twisted.internet.stdio import StandardIO, PipeAddress

File "C:\\Users\\...\\AppData\\Roaming\\Python\\Python37\\site-packages\\twisted\\internet\\[stdio.py](https://stdio.py)", line 30, in <module>

from twisted.internet import \_win32stdio

File "C:\\Users\\...\\AppData\\Roaming\\Python\\Python37\\site-packages\\twisted\\internet\\\_win32stdio.py", line 9, in <module>

import win32api

ImportError: DLL load failed: %1 is not a valid Win32 application

\-----------------------------------------------------

&#x200B;

It lookslike this error is raised by twisted, which is apparently changing the work directory after importing daphne server.


I had a previous installation of Python on this location, which is not active anymore.

&#x200B;

Does any of you know how to correct this?

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

Jupyter complains of no anaconda3 when anaconda3 was never on my system

I'm trying to set up Jupyter, and for the most part it works fine. However, I'm getting this error:

Traceback (most recent call last):
File "/usr/lib/python3.7/site-packages/tornado/web.py", line 1592, in _execute
result = yield result
File "/usr/lib/python3.7/site-packages/tornado/gen.py", line 1133, in run
value = future.result()
File "/usr/lib/python3.7/site-packages/tornado/gen.py", line 1141, in run
yielded = self.gen.throw(*exc_info)
File "/usr/lib/python3.7/site-packages/notebook/services/sessions/handlers.py", line 73, in post
type=mtype))
File "/usr/lib/python3.7/site-packages/tornado/gen.py", line 1133, in run
value = future.result()
File "/usr/lib/python3.7/site-packages/tornado/gen.py", line 1141, in run
yielded = self.gen.throw(*exc_info)
File "/usr/lib/python3.7/site-packages/notebook/services/sessions/sessionmanager.py", line 79, in create_session
kernel_id = yield self.start_kernel_for_session(session_id, path, name, type, kernel_name)
File "/usr/lib/python3.7/site-packages/tornado/gen.py", line 1133, in run
value = future.result()


/r/IPython
https://redd.it/aogr33

Only allow a route to be accessed from within the flask app

I followed a couple of tutorials and now have a form and a /create-user route which accepts the data and creates a user in the database.

What is the correct way to protect this route so that it only accepts a call from within the flask app?

otherwise, can't people just post directly to it and create users using postman or insomnia.?

/r/flask
https://redd.it/aohws1

Web GUI for Apache logs parser with Flask for beginners

Hi, everyone!

&#x200B;

I made a video on how to make a Web GUI with Flask framework for a Python script using the Apache log parser example.

Detailed explanation for beginners.

&#x200B;

Covered topics:

\- Tools for regular expressions validation

\- What is 'if \_\_name\_\_ == '\_\_main\_\_' and \_\_name\_\_ attribute

\- Creating a Flask application

\- Flask template inheritance

\- Sending data from a Flask app to a HTML template and reverse - from HTML form to the Flask app.

\- Bootsrap 4 layout (a bit)

\- and more

&#x200B;

Youtube video: [https://www.youtube.com/watch?v=4v3NEGfeff4](https://www.youtube.com/watch?v=4v3NEGfeff4)

&#x200B;

Thanks for watching.

/r/Python
https://redd.it/aofwx5

DjangoCon US 2018 - Auto-generating an API using PostgreSQL by Mjumbe Poe
https://www.youtube.com/watch?v=fNXpQ14LKfk

/r/django
https://redd.it/aoh983

Best practice for home page and authentication?

I'd like to create an app that displays certain information on the home page if a user is logged in.  Take GitHub for example.  If you are logged in, [GitHub.com](https://GitHub.com) is your profile.  But if you're not logged in, it's a sign up form. 

I guess I'm asking what the best practices are for displaying different information at the same route depending on whether a user is logged in?  Would I use a conditional to return different templates depending on authentication status?  Or is there a better/more secure way?

Thanks for any help you all can provide.

/r/flask
https://redd.it/aojg3c

New to python, wanted to show my first 2 proper projects

I am not sure if this is the right place to post this, but I have been practicing python and wanted to show off my recent projects which I worked hard on getting working (And thanks to someone at r/learnpython for helping me with the first)

&#x200B;

The first program is a timer, using tkinter for a GUI. I really prefer having a GUI for all my programs, it makes it very nice to use.

[https://steamuserimages-a.akamaihd.net/ugc/939467109946388671/5F61D994F94187E3F6A4DD3C6FF8130CEF7E91E6/](https://steamuserimages-a.akamaihd.net/ugc/939467109946388671/5F61D994F94187E3F6A4DD3C6FF8130CEF7E91E6/)

My second program uses TURTLE Graphics and Tkinter to make a worse-paint program.

[https://steamuserimages-a.akamaihd.net/ugc/939467109946391937/890D58664BB2D587ACDB39B649129A95489DC540/](https://steamuserimages-a.akamaihd.net/ugc/939467109946391937/890D58664BB2D587ACDB39B649129A95489DC540/)

The arrows allow you to turn and move the the turtle, you can change the values it moves by in the boxes and there is a toggle to lift and drop the pen.

&#x200B;

Thanks for reading!

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

Flask website example

Hello all,

Has anyone found a good resource for flask based websites? I mean pages created with flask that one can download and then modify for learning purposes. I am looking to learning a bit of flask to build a small page to use as a control for a homemade thermostat.

I find that following a tutorial from the beginning takes a really long time and I think it would be helpful to have a working example that one can modify while reading the documentation.

Cheers

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

PyCon 2020-2021 location announced - Pittsburgh!
https://pycon.blogspot.com/2019/02/pycon-2020-2021-location.html?

/r/Python
https://redd.it/aom1dp

len("😂") crashes IDLE

Kinda cool, I guess.


(Latest release (3.7.2) for Windows.)

/r/Python
https://redd.it/aolz00

[N] University of Toronto is offering a course on Quantum Machine Learning through edX!

The course has just started a few days ago: [https://www.edx.org/course/quantum-machine-learning](https://www.edx.org/course/quantum-machine-learning)

>By the end of this course, you will be able to:
· Distinguish between quantum computing paradigms relevant for machine learning
· Assess expectations for quantum devices on various time scales
· Identify opportunities in machine learning for using quantum resources
· Implement learning algorithms on quantum computers in Python

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

Is BeeWare reliable at the moment ?

hello , I have several months to complete a school project and PyBee is exactly what I am looking for , considering python for building cross-platform apps for mobile phones only, has anyone succeeded in making an App using BeeWare ? Or is it better to learn C# and consider Xamarin ?

P.s: I have fairly good knowledge in C,C++ and several other basic langs.

Thank You, Have a nice day ahead.

/r/Python
https://redd.it/aok052

Best date time picker for meeting / event scheduled app

Hi all,

I’m need some inspirations for date time pickers to implement for web django app similar to doodle.

The logic I proposed is users can either create events with fixed date / time settings or more dynamic date/ time settings.

Further explanation:
Select availability?
a. Date
b. Set time
i. Start time
ii. End time
*Both optional, in most cases users will have a start and end time


I would be grateful for any recommendations that work well with bootstrap 4 and django.



/r/django
https://redd.it/aonb70

Run a tensorflow.js program using flask

Im new to both flask and tensorflow, so its probably not surprising that i have no idea what i am doing

What i want to do, however is this: run a tensorflow demo ([https://github.com/tensorflow/tfjs-examples/tree/master/webcam-transfer-learning](https://github.com/tensorflow/tfjs-examples/tree/master/webcam-transfer-learning)) with flask.

Problem: when i run it, the demo, which should use the webcam, says it cannot find a webcam.

(webcam is there, live demo works as expected, but the locally run demo cannot turn on or even find the webcam)

Is there even a known way to solve this? Or will i have to butcher the demo to accept the webcam frames sent from the server side (like this: [https://github.com/log0/video\_streaming\_with\_flask\_example](https://github.com/log0/video_streaming_with_flask_example))

&#x200B;

/r/flask
https://redd.it/aor0u2

Best book or resources for mastering django 2.2 ?

I learned basics of Django and i want to master django in-depth step by step.

/r/django
https://redd.it/aorv3w

Is there a way to use the django_extensions shell_plus --notebook as the shell for debugging a view using ipdb.set_trace()?

It's an esoteric use case, but basically, stepping through the code in ipdb is great for debugging, but it would be even better to step through the view code in an jupyter notebook.

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