How would you create a factory based method using lambda? function signature looks like this. Factory gets a string parameter and returns the instance. class Foo: @abstractmethod def store(factory: Callable[[str], Bar]) obj = factory("abc") // store or call to get instance class Bar: def __init__(self): pass How to call this method using lambda? Foo.store(lambda k:… Read More factory pattern with lambda
I am studying a bit of code, which contains a factory method, if I am remembering my object orientation correctly. The factory method and the related classes can be described by the following pseudo-C++. The class Actor is the base class for the various implementations of concrete actions or operations, which in turn are implemented… Read More Can a factory method return 0 in case of an error?
My code works but it doesn’t bring the header with the names, it only brings the numbers 0 1 … 10 , what can I do ? Utils_db.py def consulta_sql(sql): try: connection = psycopg2.connect(user="postgres", password="postgres", host="localhost", port="5432", database="tb_cliente") cursor = connection.cursor() except (Exception, psycopg2.Error) as error: try: cursor.execute(sql) connection.commit() except (Exception, psycopg2.Error) as error: finally:… Read More Export Postgresql Table to excel with header in Python
I’m trying to build a factory that constructs implementations of a given interface. To make adding new implementations of that interface easier, I’m trying to have the various implementations auto-register their constructors with the factory at init() time, but I can’t seem to figure out if it’s possible to make something like this. Here’s a… Read More Function types that return interfaces in go
I’m having trouble getting MyPy to pass my script which contains a dataclass Bar with an optional argument foos that holds a list of Foo objects and defaults to an empty list. Stranger still, adding a method Bar.sum_foos() which iterates through self.foos raises a second MyPy error. Am I misunderstanding how to set the correct… Read More MyPy fails dataclass argument with optional list of objects type
I am receiving an IFormFile from a controller. What I want to do next is to process it and get its content. I expect to get .docx, .txt or .pdf file and I want a single class to process any of these files based on extension given. I created and made my class to do… Read More Class behavior based on given data
I created a task like the following code Task task = new(async () => { // without await Task Delay dont work await Task.Delay(TimeSpan.FromSeconds(5)); Console.WriteLine("Task is down"); }); task.Start(); var awaiter = task.GetAwaiter(); awaiter.OnCompleted(() => { Console.WriteLine("Task is Completed"); }); Why the task completed first is printed and then the task is down The task… Read More Why the TaskCompleted is executed before the end of the operation
I’m creating a clone for a website where parents can create a list of things they need for their newborn baby so other people can buy it for them as a gift. At this moment I’ve managed to insert data into my table and to link that row of data to the user id (so… Read More LARAVEL: Display lists that belongs to a specific user_id
I want to get the Client name from the Api using fromMap() method as shown bellow: factory Order.fromMap(Map<String, dynamic> map) { return Order( created_at: Tracker.decode(map[‘created_at’]), id: map[‘id’], updated_at: Tracker.decode(map[‘updated_at’]), total_price: map[‘total_price’], status: map[‘status’], client: map[‘client’] ); } client is an object of Client Model .. I got the following error: type ‘_InternalLinkedHashMap<String, dynamic>’ is not… Read More type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'Client' in type cast in flutter?
I am trying to install inotify-tools.x86_64 in a rocky8 linux machine. I am getting the following error. Any leads are much appreciated ~yum install inotify-tools.x86_64 Last metadata expiration check: 1:09:43 ago on Thu 19 May 2022 04:50:55 PM UTC. No match for argument: inotify-tools.x86_64 Error: Unable to find a match: inotify-tools.x86_64 I tried to install… Read More inotify not installing in rocky8 linux