As a learning experience, I would like to build a site which is structured in this (simplified) fashion:
Registered users can log in to their accounts. Each user has his own "profile"
Once logged in, they can join certain "networks" or groups (or whatever you'd like to call them.)
These users can only view the content of these networks if they have joined them.
Networks have admins, each with varying, customizable permissions (x, y, and z). These admins can edit the network's content.
How can I go about achieving this (in basic terms) with Pyramid's __acl__, RootFactory, and authorization/authentication features? How would each network have its own permissions relative to the basic log-in/out feature for user accounts?
I've read the documentation multiple times, and I am starting to grasp how Pyramid security works; however, I feel as if I need some more specific clarification. For instance, in order to create the most simple of log-in features, do I need to specify an __acl__ in my RootFactory, or is this simply defining various groups, regardless of who can log in? Basic things, but also with enough "unusual" circumstance that I can see how it all fits together...
Note: I'm not looking for someone to write me code. I'm just looking for some basic specification in a situation which I do not understand.
Thanks for the help.
I recently added login/authentication/authorization to an URL Dispatch based pyramid application. I used a chapter from one of the official tutorials (http://docs.pylonsproject.org/projects/pyramid/en/latest/tutorials/wiki2/authorization.html). I prefered this concise chapter over the large security chapter of the narrative documentation . If you want to use Traversal, choose same chapter from official tutorial creating a Wiki in ZODB.
At least this chapter will answer your question regarding basic login/logout, create users/groups, create and apply basic ACL to RootFactory, protect views with permissions.
To address your site structure I would recommend Michael Merickels Tutorial (http://michael.merickel.org/projects/pyramid_auth_demo/index.html). It applies the concepts from the documentation about resources/security to several use cases. I really liked it, may be you get inspired too. If you come back to ask more specific questions regarding these use cases, answers could be more easy and concise than the one to your current question.
Related
I have developed Multi-tenant SAAS apps in PHP/Laravel but recently I had a challenge to develop one in Django/Python. I am still learning Django though and I really like Django rest framework (DRF). But I have difficulties to figure out the highlighted areas below, If someone shows some light, I will be good to go:
How to handle subdomains/domains and selecting the right tenant db
How to manage and dynamically handle different database in django
Can multi-tenant apps backend still be managed from Django admin interface
I will be using queues and other apps scalling techniques, need tips and tricks if any
Any example out there
Any challenge experience when developing SAAS through Django
Well...
django-subdomains
There are people who asked in SO questions about dynamic databases in django (including, ahem... me). I'm not entirely sure I understood what you mean by "dynamically handle different database" so I guess just go to the links I just mentioned and pick out the best one for your project. (also - perhaps this is more relevant?)
Check out django-multitenant-schemas and this answer too.
There was a video of the guys behind Disqus (one of the largest django app in the world) explaining how they handle scaling. Here another interesting article on the subject. Also, the legendary SO question Does Django Scale.
(and 6.) Check out this answer
I hope that's detailed enough. I know this might be a disappointing only-links answer, but this is the reality of it - Django is a newer framework, and web development with python is still less common than php. With that in mind, understand that for all the awesomness of django (and it is awesome), with more complex needs there's more you'll have to do yourself.
In this case, you'll have to figure out how to do each part of the way seperatly and then combine it all. You can easily find a way to create a REST django app for example, but then you'll need to figure out how to combine it with another package (such as the above subdomains).
You can find a million examples out there of people doing freaky things with django. It's really powerful (when I learned about dynamic models I was blown away). But the more complex your app, the more you'll need to do yourself.
Pick it up, one step at a time, and come back to SO with specific issues you're having (or the django users google group). Good luck!
I just need pointers on where to begin. I have some experience with Python, but nothing to brag about.
My end goal is to create a website that will allow multiple users to access it from different computers to fill the table with simple data, very simillar to what Google Sheets alows, and then printing it on a single sheet of paper. Idealy I want my programm to intelegently determine the width of rows and columns so that the table would look decently and would fill the page accordingly.
Right now all I need is some pointers on where to begin. Like can I use SQL to create these tables and have online fuctionality for users to access and fill the spreadsheet, and how to go about printing it.
I know this is very noob question, but I can't seem to find anything relevant here on by just using google.
Thank you.
I don't think this is a very good StackOverflow question because it is very broad and not programming specific. You are asking how to start a new software project which in my opinion belongs more in the software engineering meta: https://softwareengineering.stackexchange.com/
Anyhow, how I would take on such a project:
First I would define my project scope. What is the functionality of the end-product? What must it be able to do and what not? Who are the end-users using the product and what do they expect? These are so called functional requirements.
In which way does the product deliver value? Is it fast, modifiable, distributed... These are so called non-functional requirements.
Develop a basic software architecture based on the previous requirements using patterns and tactics and identify the different subsystems. On the top of my hat I would divide it in a frontend component using a web application, backend component in your favourite language and a database component for persistence.
Research possible languages frameworks for each component, decide and start coding!
For the 4th step I suggest you have a look at Python Django which includes all of this stuff out-of-the-box.
I'm working on a software that deals with drones.
My team introduced a server to allow command and control activities with multiple drones.
Now, I'd like to test its API and create a python module for automated testing.
The API includes actions like add marker, delete marker and so on and so forth that you can do in the app.
I've been researching if there might be a tool to allow me to randomize these actions automatically to create scenarios that imitate user actions.
For example:
check the license, add mission, add a marker, fly to position and delete Marker.
Each of those actions is a request sent to the server within the app, but I've already recreated those activities as functions in python. The server actions have also been written in Python(server is tornado). Now I just need to find a way to randomize their activation(the data they send to the server is generated randomly and legally as well, and that's not a problem).
So before wasting a lot of my time creating these scenarios by hand, I'm sure someone already faced this kind of problem. I couldn't find it here though. Searched for hours but there are so many questions I might have missed something related to my issue.
I can build such a tool myself and even share a git to it here if it comes to that. Then it will be helpful to anyone encountering this question.
I thought it would be worth asking anyway.
Let me know if there are any other details you need to know to answer this question.
Thanks!
I am a data analyst and just assigned to build a real time recommendation engine for our website.
I need to analyse the visitor behavior and do real time analysis for those input. Thus I have three questions about this project.
1) Users are not forced to sign-up. Is there any methodology to capture user behavior such as search and visit history?
2) The recommendation models can be pre-trained but the prediction process takes time. How can we improve the performance?
3) I only know how to write Python Scripts. How can I implement the recommendation engine with my python scripts?
Thanks.
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However, 90% of our customers purchase the products during their first visit and will not come back shortly.
We cannot make a ready model for new visitors.
And they prefer to use itemCF for the recommendation engine.
It sounds like a mission impossible now...
This is quite a broad question however I will do my best to answer:
Visit history can be tracked by enabling some form of analytics tracking on your domain. This can either be a pre-built solution that you implement and will provide a detailed overview of all visitors to your domain, usually with some form of dashboard. Most pre-built solutions provide a way to obtain the analytics that have been collected.
Another way would be to use browser cookies to store information pertaining to each visit to your domain and their search/page history. This information will be available to the website whenever the user visits it within the same browser. When the user visits your website, you could send the information to a server/rest endpoint which could analyse information (I.P/geolocation/number of visits/search/page history) and make recommendation based on that. Another common method is to track past purchases ect.
To improve performance one solution would be to always have the prediction model for a particular user ready for when they next visit the site. That way, there is no delay. However, the first time a user visits you likely wont have enough information to make detailed predictions so you will have to resort to providing options based on geolocation (which shouldn't take to long and wont impact performance)
There is another approach that can be taken and above mainly talked about making predictions based on a users behavior browsing the website. Content-based filtering is another approach which will recommend things that are similar to a item that the user is currently viewing. This approach is generally easier, as it just requires that you query a database for items that are similar in category, purpose/use ect.
There is no getting around using javascript for the client side stuff, however your recommendation engine can be built in Python (it could be a simple REST api endpoint with access to the items database). Most people use flask,django or eve to implement REST API's in Python.
The site won't be that complicated and will resemble a modern blog (users, messages, news and other similar features).
Do I need to use a framework for this, and if so, which is best?
Pyramid, Django?
You certainly don't need a webframework to create a simple website. Given that you're new to python and interested in building a python website, I imagine this implies: you're interested in learning python. If you're exclusively interested in learning django-python, there's no reason you can't jump in to django, as Ronak said, of course. He's right. It has a lot of documentation. But it will make for somewhat of an odd intro to python.
If I were in your shoes, I'd either start making some offline programs first, or consider an ultra-lightweight framework. Many would advocate web2py or pyramid for ultralightweight. I might consider going even lighter. Something like Bottle, where you're more or less just pairing functions with urls. This way you can at least do a bit of hacking/trial-and-error, instead of launching right into django.
It's not that django doesn't use python-- it will tell you many times that it is in fact 'just python.' But it's adapted at its core to be used in a large business setting (the chicago something or other online, i think). So it enforces various rules that are helpful in managing many different employees working on a project together. You may or may not wish for this kind of 'help.' It also means the scale of projects is assumed to be large and the time-horizon, limitless. If you want to see how a python dictionary works, you may not want to spend a long time configuring settings and creating the pseudo-static-typing you need for your database, and so on, just to execute your project and see a result.
I realize I will automatically get downvoted for this, but I believe it to be sound advice.
It depends on what kind of website you are planning to come up with. If the website is going to be just a set of static HTML files, then you don't really need a framework. But if your website will have lots of dynamic content that will get updated on regular basis, you should go with some framework. That will make your life maintaining the website much more simpler.
Django is the most popular framework written in Python. It has very good documentation and a strong community base too.
Go with Django - 10,000 Elvis fans can't be wrong.
Or roll your own from scratch. You'll learn a lot, know everything about how you site works, and better appreciate what a framework does for you.
As RonakG first pointed, it all depends on the kind of website you intend to have up and running. Actually, your question is too general for a single, definitive answer. There are more aspects to consider other than just being in python. For example, deadlines. This means considering the learning curve to achieve your results. If you don't have much time, a steep learning curve (time to learn it in order to develop it) is certainly something you will want to avoid. Perhaps you already develop in other languages, and need integration and/or migration support, need scalability, reusability, etc, etc, etc.
Another thing that is not so clear in your question is what you mean by "The site won't be that complicated and will resemble a modern blog (users, messages, news and other similar features)". If it really resembles just a modern blog, with users, messages and news, you could google for CMS (Content Management Systems). There are many options available, that could make you have your site up and running in almost no-time. All you'll have to learn is how to customize whatever it has to as to comply to your needs.
That said, if you prefer python, there are some good CMSs available which you can develop your site fast, like Plone. And if you prefer Django, there's Django CMS and there's the excellent Pinax project, which takes the django code reusability to deliver you sample fully customizable, complete websites.