How to "unroll" a "recursive" structure

Not sure how to call it, but say you have a class that looks like this: class Person { public string Name; public IEnumerable<Person> Friends; } You then have a person and you want to...

How to start screensaver from system service

I have several variants to start the screensaver. I favourite is [DllImport("user32.dll", SetLastError = false)] private static extern IntPtr GetDesktopWindow(); [DllImport("user32.dll", CharSet =...

LINQ to XML. Enumeration yielded no results

I'm having trouble populating an object from an XML file. I've copied an example I've found almost exactly, with variable names changed, but I keep getting the "Enumeration yielded no results"...

Rails nested_form link_to_add not working when pre-building nested model instance

I'm having a rough go integrating ryanb's awesome nested_form gem into my rails 3.1.3 application. I'm afraid my Javascript skills are too limited to know whether it's my code (likely) or the gem...

char + String giving strange result

Question: Given a string, take the first 2 chars and return the string with the 2 chars added at both the front and back, so "kitten" yields"kikittenki". If the string length is less than 2, use...

Using return in ES6 generator function

I am having trouble finding out what happens if you use a return statement instead of yield. function *gen(){ const val = yield someAsyncFn(); assert.equal(val,4); return val; } how does...

Order of reducer and saga

When dispatching an action is the order when it arrives to a reducer and a saga guaranteed? Can I rely on that it first enters the reducer then the saga? Reducer: function reducer(state,...

How can I make xml from complex dictionary in Python?

I want to make recursive function to generate xml from complex dictionary (i.e. dictionary of dictionaries, for example dataDict = {'item1': 'this in item1', 'item2': 'this in item2', 'item3':...

Apparently Random Error: "Antiforgery token validation failed. The antiforgery cookie token and request token do not match."

Background I have a relatively new ASP.NET Core 2 site. It's running on just one server (Windows Server 2012 R2, IIS 8.5), and I only restart the site once every few days when I upload an update....

Scrapy stops scraping but continues to crawl

I’m trying to scrape different information from several pages of a website. Until the sixteenth page, everything works: the pages are crawled, scraped and the information stock in my database,...

Django Celery Scrappy ERROR: twisted.internet.error.ReactorNotRestartable

I have next model: Command 'collect' (collect_positions.py) -> Celery task (tasks.py) -> ScrappySpider (MySpider) ... collect_positions.py: from django.core.management.base import...

raise JSONDecodeError("Expecting value", s, err.value) from None JSONDecodeError: Expecting value

Python 3.6 I am trying to use python to crawl the location of bus stop within an area from Google Maps. I have read similar questions but still did not find a solution. File...

Tornado ThreadPoolExecutor delays requests when yielding results

System specification MacOS 10.13.6 Python 3.7.0 Tornado 5.1.1 I'd like to use a ThreadPoolExecutor to run blocking functions in a Tornado instance that serves a RESTful service. The ThreadPool...

c# combine yield return of multiple functions

c# yield compute will delay execution of each iteration of a loop only when that particular enumerated element is actually needed by the caller. Is it possible to combine multiple such yield...

What's the source of thread-unsafety in this usage of pandas.Series.reindex(, copy=True)?

Calling pd.Series.reindex is not thread safe (bug report). My question is why is Series.reindex (which returns a copy and seems like a functionally pure operation) not thread safe, even when...

I'm trying to write a python script to read a csv using Mapreducer and im getting the error ValueError: too many values to unpack (expected 2)

0 I'm running the following Python code in MapReduce: from mrjob.job import MRJob from mrjob.step import MRStep class productRevenue(MRJob): #each input lines consists of product,...

Twint Module and creating a dataframe from tweets

I have an issue converting twint results into a dataframe. I am unable to fetch the tweet results and store it into a dataframe. Everytime I set c.Pandas=True I get an error. Any ideas how to...

How to implement an efficient WhenEach that streams an IAsyncEnumerable of task results?

I am trying to update my toolset with the new tools offered by C# 8, and one method that seems particularly useful is a version of Task.WhenAll that returns an IAsyncEnumerable. This method should...

In JavaScript ES6, what is the difference between an iterable and iterator?

Is an iterable the same as an iterator, or are they different? It seems, from the specifications, an iterable is an object, say, obj, such that obj[Symbol.iterator] refers to a function, so that...

Why is using IAsyncEnumerable slower than returning async/await Task<T>?

I'm currently testing out C# 8's async streams, and it seems that when I try to run the application using the old pattern of of using async/await and returning Task<IEnumerable> it seems to be...

Running a Scrapy spider in Google Cloud Function

I'm currently trying to get scrapy to run in Google Cloud Function. from flask import escape from scrapy.crawler import CrawlerProcess from scrapy.utils.project import get_project_settings def...

Client sent an HTTP request to an HTTPS server

I have a python application running on a virtual machine, were a legacy, and now I'm migrating to a Kubernetes. I use influxdb==5.2.3 package, connecting to this form Influx(host=r'influx_HOST',...

Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output - while installing auto-py-to-exe through pip

I am trying to download auto-py-to-exe on a different (windows) device than I usually use through pip. However when run I get the error (sorry it is so very very long): ERROR: Command errored out...

How to access files in the Hololens 3D object Folder

I am working on an app that uses Trilib to load 3D models. Currently the app works in Unity, and any fbx file in the PC 3D models folder is available to load in the HoloLens through remote...

Flutter Bloc state change is not updated UI with get_it

I've been building a login/authentication feature using a combination of this login tutorial and the resocoder clean architecture tutorials. It's 99% working perfectly, but it is not responding...

Prevent flutter bloc state changes when navigate to new page

I'm new in using flutter_bloc and currently facing an issue in my project. So, i have bloc class like this: class TestBloc extends Bloc<TestEvent, TestState> { @override TestState get...

Webcam in Dash (Plotly) for stream in Python?

Is it possible to query a webcam from the user in Python using e.g. Plotly Dash and output the frames on the webpage using OpenCV2? How would this work in concrete terms? I have already tried the...

get result from concurrent.futures which runs a kafka consumer in a python ThreadPoolExecuter

I am creating kafka consumers dynamically based on number of partitions that a topic might have. ( using KafkaConsumer form Kafka-Python ) Once I create the consumers, using ThreadPoolExecuter I...

IndexError: tuple index out of range when I try to create an executable from a python script using auto-py-to-exe

I have been trying out an open-sourced personal AI assistant script. The script works fine but I want to create an executable so that I can gift the executable to one of my friends. However, when...

How does Task.Yield work under the hood in Blazor WebAssembly?

How does Task.Yield work under the hood in Mono/WASM runtime (which is used by Blazor WebAssembly)? To clarify, I believe I have a good understanding of how Task.Yield works in .NET Framework and...