flask api and incremental testing

I am working on my first flask api, and I must test it because I'll be using it for a task that's rather sensitive. The issue is when I'm testing the CRUD part of the api I am not using unit tests which is bothering me as I ended up using incremental testing. Any tips or resources I could read to get an idea how to test CRUD operations with unit tests ?

/r/flask
https://redd.it/6qnd66

[D] Andrew Ng's "Structuring a ML Project" summary in a diagram
https://medium.com/@erogol/designing-a-deep-learning-project-9b3698aef127

/r/MachineLearning
https://redd.it/6vplgr

I wrote LaTeXiPy, a package which allows you to easily generate plots in multiple formats, and can play well with LaTeX!
https://github.com/masasin/latexipy

/r/Python
https://redd.it/6vpcnf

Prevent modification of model through model/manager/queryset methods

Hello everybody,

I have a model which needs complex logic for update, creation and deletion.
I would like to have only one custom manager method to handle creation (let's call it `new`), one model method to handle deletion and prevent all the others.

My question is : Is there other methods that can modify models besides the ones below? Is there any way to know if I'm not missing a method that can modify models (other than reading the whole documentation)?

Here is what I have now :

class MyModelQuerySet(models.QuerySet):
def update(self, *args, **kwargs):
raise ValueError("Use 'new' method from manager instead.")

def delete(self):
raise ValueError("Use 'delete' method from model instead.")

class MyModelManager(models.Manager):
def get_queryset(self):
return MyModelQuerySet(self.model, using=self._db)

def create(self, *args, **kwargs):
raise ValueError("Use 'new' method from manager instead.")

def get_or_create(self, *args, **kwargs):
raise ValueError("Use 'new' method from manager instead.")

def update_or_create(self, *args, **kwargs):
raise ValueError("Use 'new' method from manager instead.")

def new(self, *args, **kwargs):
obj = self.model()
# Insert complex logic here
super(MyModel, obj).save()

class MyModel(models.Model):
def save(self, *args, **kwargs):
raise ValueError("Use 'new' method from manager instead.")

def delete(self, *args, **kwargs):
# Insert another complex logic here
super().delete(*args, **kwargs)

Thanks in advance for any bit of advice!

/r/django
https://redd.it/6vrbhy

Created this web application using Flask. Please let us know your reviews about it.
https://pageone.herokuapp.com

/r/flask
https://redd.it/6vsean

JQuery dropdown menu not working

I am in the middle of creating a very basic website and would like to use a drop down menu in the navigational bar.

I have included the Javascript library above my code but the dropdown fails to open when I click on it. You notice I have it in 2 places at the moment to see if it would work if I placed it in the head section but it doesn't make a difference.

I am just running it through my command line at the moment if that matters.

My code can be found here: https://pastebin.com/4qShX7zG

Thanks!

/r/flask
https://redd.it/6vsl1p

I'm struggling to learn how to upload/display images

Hey guys,
Newbie here.

I'm struggling to upload an image in a form. Right now, after setting an ImageField to my models:

imagem = models.ImageField(blank=True,upload_to = 'imagens/')

and adding to settings.py

MEDIA_ROOT = [os.path.join(BASE_DIR,'imagens')]
MEDIA_URL = '/media/'


the image field shows on the post form, but the image doesn't upload. If I try to upload on the admin, I get this error:

TypeError at /admin/posts/post/3/change/
expected str, bytes or os.PathLike object, not list

Is there an easy way to understand the basic steps for image handling?

Pillow is installed

/r/django
https://redd.it/6vtx01

[D] CVPR tutorial on "Mathematics of Deep Learning"
https://www.youtube.com/watch?v=Mdp9uC3gXUU

/r/MachineLearning
https://redd.it/6vqpxc

How use Class-based views to create a user registration?

I was wondering how can I use class based views to create a user registration because I think I can do this with a ModelForm and do all the validation in this and after using a CreateView is this correct? Or should I use an only a CreateView.

Also, if anyone has any tutorial to do this to help me understand the use of clean() on the form, how validate?

Yea, silly question :c

/r/django
https://redd.it/6vugb9

Changing a model's attribute from CharField to ForeignKey makes the object unuseable and returns "unknown NAME_id"

Say I had the following model:

class greatModel(models.Model):

attribute = models.CharField(max_length=100)

and life was good. But then another dev tells me "hey, I actually have a whole model called `attribute` in another app `HIS_APP` on this project! Just make a ForeignKey. Sounds great, so I do:

class greatModel(models.Model):

attribute = models.ForeignKey('HIS_APP.attribute', on_delete=models.CASCADE)

but now EVERYTHING I do with this model including migrations will fail on:

django.db.utils.OperationalError: (1054, "Unknown column 'attribute_id' in 'where clause'")

Any idea where I might be going wrong? I've tried dropping/remaking the model/table but that was of no use.

/r/django
https://redd.it/6vvcyq

Learning Python Is Proving To Be Hilarious

/r/Python
https://redd.it/6vrxox

Best Django books to start with?

Hi all,
I have some rookie big data py 2.7 experience. I want to get into Django and web apps and websites. Since I already has a very basic py understanding, it just makes sense to work with Django. Does anyone have any good books on amazon they recommend for beginners that really walks you through and explains concepts well?

/r/djangolearning
https://redd.it/6vvw3v

[R] CS281: Advanced Machine Learning
http://www.seas.harvard.edu/courses/cs281/

/r/MachineLearning
https://redd.it/6vx171

What language features makes Python positively stand out for you?

I'm curious what language features you *love* about Python that keep you coming back and make you enjoy the development experience.

For me I'd have to say a short list would be list/dict comprehension, as well as decorators.

What about you?

/r/Python
https://redd.it/6vtcdq

This project was borne out of our experiences at YunoJuno with 'expiring links' - which is a common use case of providing users with a URL that performs a single action, and may bypass standard authentication.
https://github.com/yunojuno/django-request-token

/r/django
https://redd.it/6vxax4

Python datetimes made easy.
https://github.com/sdispater/pendulum

/r/Python
https://redd.it/6vxbqd

What hack can I do to allow me to use the algorithmicx latex extension in my notebook?

I've found exactly one answer to this topic online and it says MathJax doesn't do it.

Is there any non-portable, slightly hacky way of getting this to work? Something that would render to jpeg and embed that on the page?

/r/IPython
https://redd.it/6vxyjr

Monitoring Road Traffic with OpenCV
http://andrew.carterlunn.co.uk/programming/2017/08/24/monitoring-road-traffic-with-python.html

/r/Python
https://redd.it/6vxb1x

[AF][SQLAlchemy] Custom method for order_by when filtering

I'm working on a project where the user inputs a location (latitude and longitude) and the system searches the database for the closest entries by distance. However, I am unsure of how to pass a custom function (in this case, a function that calculates the distance to the provided lat/long) to the order_by method rather than by one of the fields in the database. I thought this would be a fairly common thing to implement, but I couldn't find anything helpful on StackOverflow, etc. Any help would be appreciated!

/r/flask
https://redd.it/6vwwv0

[P] Fashion-MNIST a MNIST-like fashion product dataset under MIT
https://github.com/zalandoresearch/fashion-mnist

/r/MachineLearning
https://redd.it/6vzch9