guru | Implements SuperMemo-2 , a spaced repetition algorithm | Learning library

This explains the "Bridge" pattern I'm referring to: https://refactoring.guru/design-patterns/bridge

Here's a scenario from the post above:

Say you have a geometric Shape class with a pair of subclasses: Circle and Square. You want to extend this class hierarchy to incorporate colors, so you plan to create Red and Blue shape subclasses. However, since you already have two subclasses, you’ll need to create four class combinations such as BlueCircle and RedSquare.

The problem this scenario presents:

Adding new shape types and colors to the hierarchy will grow it exponentially. For example, to add a triangle shape you’d need to introduce two subclasses, one for each color. And after that, adding a new color would require creating three subclasses, one for each shape type. The further we go, the worse it becomes.

To avoid this problem, we implement the Bridge pattern like so:

Extract the color-related code into its own class with two subclasses: Red and Blue. The Shape class then gets a reference field pointing to one of the color objects. Now the shape can delegate any color-related work to the linked color object. That reference will act as a bridge between the Shape and Color classes. From now on, adding new colors won’t require changing the shape hierarchy, and vice versa.

I understand the how and why of this implementation.

But what if we need a third hierarchy, e.g. BorderStyle (where a border style can be Straight, Wavy, or ZigZag?)

I guess we could implement a second Implementor class for BorderStyle and pass it into a Shape constructor like so:

I need to do a match and join on two data frames if the string from two columns of one data frame are contained in the string of a column from a second data frame.

Example dataframe:

I'm having hard time web scraping this web page top-programming-guru.
I was looking to have retrieve a list of all the youtube channels listed in the page.
I'm using BeautifulSoup, I took a look at source code of page, Then and try this code:

I have deployed a Python app to Azure app service (OS: Linux, Python) from Visual Studio Code. I can able to see the files in the wwwroot folder as well as in the app service, but when I am trying to access the app service by URL, the login page not displayed. Please refer to the code below:

I have a big problem with the webhook for confirms a subscribe agreements. I'm used the SDK [https://github.com/paypal/PayPal-Python-SDK/blob/master/samples/subscription/billing_agreements/get.py] If somebody could help me, my errors is the next:

Traceback (most recent call last):

File "/home/jjorge/venvs/payments/lib/python3.7/site-packages/django/core/handlers /exception.py", line 34, in inner response = get_response(request)

File "/home/jjorge/venvs/payments/lib/python3.7/site-packages/django/core/handlers/base.py", line 115, in _get_response response = self.process_exception_by_middleware(e, request) File "/home/jjorge/venvs/payments/lib/python3.7/site-packages/django/core/handlers/base.py", line 113, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/home/jjorge/venvs/payments/lib/python3.7/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view return view_func(*args, **kwargs)

File "/home/jjorge/venvs/payments/lib/python3.7/site-packages/django/views/generic/base.py", line 71, in view return self.dispatch(request, *args, **kwargs)

File "/home/jjorge/venvs/payments/lib/python3.7/site-packages/django/views/generic/base.py", line 97, in dispatch return handler(request, *args, **kwargs)

File "/home/jjorge/src/guru/guru-payments/apps/paypal/views.py", line 69, in post settings.PAYPAL_CLIENT_SECRET

File "/home/jjorge/src/guru/guru-payments/apps/paypal/services.py", line 34, in execute paypal_secret_id

File "/home/jjorge/src/guru/guru-payments/apps/paypal/payment_methods.py", line 154, in get_billing_agreement 'client_secret': paypal_client_secret

File "/home/jjorge/venvs/payments/lib/python3.7/site-packages/paypalrestsdk/resource.py", line 110, in find return cls(api.get(url, refresh_token=refresh_token), api=api)

File "/home/jjorge/venvs/payments/lib/python3.7/site-packages/paypalrestsdk/api.py", line 268, in get return self.request(util.join_url(self.endpoint, action), 'GET', headers=headers or {}, refresh_token=refresh_token)

File "/home/jjorge/venvs/payments/lib/python3.7/site-packages/paypalrestsdk/api.py", line 171, in request return self.http_call(url, method, data=json.dumps(body), headers=http_headers) File "/home/jjorge/venvs/payments/lib/python3.7/site-packages/paypalrestsdk/api.py", line 214, in http_call return self.handle_response(response, response.content.decode('utf-8')) File "/home/jjorge/venvs/payments/lib/python3.7/site-packages/paypalrestsdk/api.py", line 231, in handle_response

raise exceptions.ResourceNotFound(response, content)

paypalrestsdk.exceptions.ResourceNotFound: Failed. Response status: 404. Response message: Not Found. Error message: {"name":"RESOURCE_NOT_FOUND","debug_id":"9a7aa1a765763","message":"The requested resource was not found","information_link":"https://developer.paypal.com/docs/api/payments.billing-agreements#errors","details":[{"issue":"Requested resource ID was not found."}]}

I am developing Spring Boot MongoDB example using V2.4.5. In this example when I am doing repository query, Long fields values are not getting mapped. Sample document value from MongoDB.

I'm currently working on a school project to create a quiz program (local-host) to assess students based on their marks on the quiz. So in that project's database, I have a "student" table and also a "student_name" table. I would have put it in the same table but my teacher told me to put it into two different tables as a normalization step to reach 3nf (getting rid of "transitional functions")? Below are the pictures of my tables: (Sorry, it's in Malay) "murid"(student) table "nama_murid"(student_name) table

So the problem is in the login page. Currently I'm using a "no_kp_murid"(IC number) - "katalaluan"(password) combination to log-in. So it logs in fine, but in the main_menu I'd like to display the "nama_murid"(student's name) attribute. The problem is, it displays the first student name registered and not the actual student-that-logged-in's name. Here's my code:

I'm trying to learn the design pattern norme (like refacturing guru), and i have some problem to understand how i could merge the idea of bad design with public getter/setter and factory/Builder that need "out of constructor" variable setter.

for example with the answer of this article to article to Design pattern

As you can understand, each object will need a lot of informations, and adding part should set the needed informations, but to be able to do it, it need accessor to my variable outside the constructor.

Help me figure out what i'm missing.

--- Edit To be more precise, Let's say i have 2 class : CombatObject <---- Spaceships And i have a factory that will create different type of spaceships (principally because i don't want to create more than 10 class just to change the stats of the objects)

in this case, getter/setter are not a bad design (or are they?)

I know this question has been asked before, and I've seen several of the SO responses and read the AWS docs on the subject... I have a terraform module that, in part, builds out an ECS service, cluster, task, and Fargate container: