Dynamically set variable in route wrapper

I'm using Flask-Limiter and would like to set the cost parameter on a per request basis. I can't figure out a way to get a variable passed to this parameter that would be dependent on the request. If I just pass in current\_user.zipcode\_changes I get an error saying I can't pass None type in.

[https://flask-limiter.readthedocs.io/en/stable/api.html#flask\_limiter.Limiter.limit.params.cost](https://flask-limiter.readthedocs.io/en/stable/api.html#flask_limiter.Limiter.limit.params.cost)

​

My attempt always returns 1.

The gist of my code:

def func_cost():
if current_user:
return current_user.zipcode_changes
else:
return 1

@bp.route('/zipocdes', methods=['GET','POST']
@limiter.limit("10 per day", key_func=lambda: current_user.id, methods=["POST"],\
deduct_when=func_deduct, cost=func_cost)
@login_required
def zipcodes():
form = ZipcodeForm()
if form.validate_on_submit():
current_user.zipcode_changes = len(added_zips)


/r/flask
https://redd.it/szlzi7

What is the point of request.content_md5 / Content-MD5 Header?

Flask has a `request.content_md5` which corresponds to the `Content-MD5` header. The [docs](https://flask.palletsprojects.com/en/2.2.x/api/#flask.Request.content_md5) say:

> The Content-MD5 entity-header field, as defined in RFC 1864, is an MD5 digest of the entity-body for the purpose of providing an end-to-end message integrity check (MIC) of the entity-body. (Note: a MIC is good for detecting accidental modification of the entity-body in transit, but is not proof against malicious attacks.)

What is the point of this?

I tried sending a request with a bogus value in the Content-MD5 header, and flask did not automatically fail the request.

Am I supposed to write some code that computes the hash of the request body and compare it against Content-MD5, if this is present, and then ask my clients to compute the MD5 and put it in the Content-MD5 header?

I would have assumed that clients would automatically do this as part of the client library, and the flask would automatically compare the md5 and fail with an error. It seems like this does not happen.

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

Nesting Blueprints with Blueprint.registerblueprint() fails

Even though the [Flask Docs](https://flask.palletsprojects.com/en/2.2.x/api/#flask.Blueprint.registerblueprint) state that a Blueprint can register further blueprints, I get the following error:

>AttributeError: 'Blueprint' object has no attribute 'register_blueprint'

Does someone know how I can achieve nesting blueprints?

Code

/r/flask
https://redd.it/100qn8a

Learn Restful API with Flask

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#Udemy #Python #flask #OnlineLearning #SkillDevelopment #Education #CourseLaunch #LearnFromHome

/r/flask
https://redd.it/1dnamd8

How to setup a permanent session in default Flask?

If I use Flask-Session to store session data server-side, it is as easy as passing SESSION_PERMANENT = False (not default Flask, unique to Flask-Session) to the app.config, then set the desired expiration time with , PERMANENT_SESSION_LIFETIME = desired_exp_time which is default Flask config.

If I use default Flask to store session data client-side, I need to set PERMANENT_SESSION_LIFETIME = desired_exp_time first, then state session.permanent = True in the request (ex. u/app.route), else I get this error: RuntimeError: Working outside of request context. The docs is somewhat unclear about how to implement, see here.

What I don't understand is how to setup the default Flask one. I tried to google, and found this in Stack Overflow. The accepted answer suggests setting it with before\_request, but I think why every request, we need to set session.permanent = True?

1. How to set permanent sessions in default flask properly? Where to set it?
2. Can you toggle permanent and non permanent session?
3. What should we do after session is expired? What about the session data?

/r/flask
https://redd.it/1gdur94

Flask Async Mail

🚀 Introducing Flask-Async-Mail! 📧

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✅ Supports plaintext & HTML emails
✅ Simple setup & easy integration with Flask

👉 Try it out & contribute!
📦 PyPI: https://pypi.org/project/flask-async-mail/
💻 GitHub: https://github.com/manitreasure1/flas-async-mail.git

I’d love your feedback, contributions, and ⭐ stars on GitHub! Let’s build something awesome together. 🚀🔥

\#Flask #Python #Async #Email #OpenSource

/r/flask
https://redd.it/1j10wib

Need Career Advice: Stuck in .NET Web Forms, Should I Switch to Python Flask?

Hi everyone,

I’ve been working at a company for the past 4 months. I was hired to work on a .NET Web Forms project, but the pace of work is extremely slow. For the last 3 months, I haven’t written any real code — I’ve just been learning about Web Forms.

The company is saying they’ll give me actual work on an ERP project starting next week, but honestly, I’m not feeling confident. I’ve been told there will be no proper mentorship or guidance, and I find ERP systems really hard to grasp.

On the other hand, I’m passionate about innovation and working with new technologies. I really enjoy Python and I’ve been considering switching over to Flask development instead, since it aligns more with what I want to do in the future.

I’m feeling a lot of stress and confusion right now. Should I stick it out with this company and the ERP/.NET stuff, or should I start focusing on Python Flask and make a shift in that direction?

Any advice from experienced developers would be really appreciated. Thanks!

\#CareerAdvice #DotNet #Python #Flask #ERP #WebForms #JuniorDeveloper #ProgrammingHelp

/r/flask
https://redd.it/1mbebbe

app.run() not recommended for development server?

For me it would be convenient to run the Flask development server with Flask.run() however the documentation says:

> It is not recommended to use this function for development with automatic reloading as this is badly supported. Instead you should be using the flask command line script’s run support.

Documentation link: https://flask.palletsprojects.com/en/stable/api/#flask.Flask.run

Instead they suggest to use the command line flask run which I currently do.

But I wonder how its different. Why is Flask.run not recommended?

/r/flask
https://redd.it/1p9t86o