Implementing a "rules engine" in Python

I'm writing a log collection / analysis application in Python and I need to write a "rules engine" to match and act on log messages. It needs to feature: Regular expression matching for the...

Change cell color in Excel according to adjacent dropdown value

I understand how to make a dropdown list. I understand how to make conditional formatting change the color of a cell. What I do not understand is how to make conditional formatting change the...

Reference — What does this symbol mean in PHP?

What is this? This is a collection of questions that come up every now and then about syntax in PHP. This is also a Community Wiki, so everyone is invited to participate in maintaining this...

How to test if a list contains another list?

How can I test if a list contains another list (ie. it's a contiguous subsequence). Say there was a function called contains: contains([1,2], [-1, 0, 1, 2]) # Returns [2, 3] (contains returns...

What are the options for storing hierarchical data in a relational database?

Good Overviews Generally speaking, you're making a decision between fast read times (for example, nested set) or fast write times (adjacency list). Usually, you end up with a combination of the...

Compare HashMap values in an ArrayList

I have an ArrayList and there are some HashMap<String, String> in this. So, I want to compare for same values in the maps. When I find same values then I want to keep one map of them. For example,...

Optimal Quicksort for Single Linked List

I am working on implementing a quicksort function to sort singly linked lists. What algorithm would I have to use to accomplish this ? For a linked list it would take worst case O(N) for each...

Java Arraylist of objects Contains/equals

I have looked at a number of places and most arraylist examples use "String" as their element, however places that use objects are difficult to find. Let's say I am working on a book collection...

Ways to iterate over a list in Java

Being somewhat new to the Java language I'm trying to familiarize myself with all the ways (or at least the non-pathological ones) that one might iterate through a list (or perhaps other...

Typescript: Avoid comparison by reference

I need to store a list of points and check if a new point is already included in that list class Point { x: number; y: number; constructor(x: number, y: number) { this.x = x; ...

Bash double bracket regex comparison using negative lookahead error return 2

On Bash 4.1 machine, I'm trying to use "double bracket" [[ expression ]] to do REGEX comparison using "NEGATIVE LOOKAHEAD". I did "set +H" to disable BASH variable'!' expansion to command history...

A tornado chart and p10-p90 in python (matplotlib)

I need to plot the following two things using the Python (matplotlib): A tornado chart (kinda summarizing the sensitivity analysis) And a comparison of mean p10 and p90 values for a list of...

Chef's policy groups and environments

It is clear the intention of using a policy group per environment (Like dev, staging or production, like they do here). However when it comes to handle some attributes which are...

Calculating business days in Teradata

I need help in business days calculation. I've two tables One table ACTUAL_TABLE containing order date and contact date with timestamp datatypes. The second table BUSINESS_DATES has each of the...

How to use sec_axis() for discrete data in ggplot2 R?

I have discreet data that looks like this: height <- c(1,2,3,4,5,6,7,8) weight <- c(100,200,300,400,500,600,700,800) person <- c("Jack","Jim","Jill","Tess","Jack","Jim","Jill","Tess") set <-...

VIPT Cache: Connection between TLB & Cache?

I just want to clarify the concept and could find detail enough answers which can throw some light upon how everything actually works out in the hardware. Please provide any relevant details. In...

Python difference between filter() and map()

Being new to python I am just trying to figure out the difference between filter() and map(). I wrote a sample script as follows: def f(x): return x % 2 == 0 def m(y): return y * 2 list =...

Convert missing Array to NaN

Lets take this example where I use the ShiftedArrays package lag() function. I compare array o with array c. If o is less than lag(c,1) say true, false. # dummy data o = collect(5.0:1.0:14) c =...

Python efficient way of writing switch case with comparison

I normally implement switch/case for equal comparison using a dictionary. dict = {0:'zero', 1:'one', 2:'two'}; a=1; res = dict[a] instead of if a == 0: res = 'zero' elif a == 1: res =...

Avoid re-rendering components using array.map with React+Redux

First of all, I have already gone through: /react-redux/issues/779 Stackoverflow / React Redux rerenders when creating arrays Stackoverflow / How to deal with relational data in redux? Redux /...

React Native Calendar Agenda week view not rendering properly

I started using react native calendars for my app. I used Agenda in one of my screens. There is a strange issue however when selecting dates. I have set pastScrollRange and futureScrollRange. The...

Passing HTML form variable to python function in Django

I'm extremely new to Django, but I have been trying to figure out the solution for hours. I want to pass a variable from a html form to the backend and then use the variable there to make an api...

jszip can unzip files but not folders

I would like to download and unzip a folder with JSZip, I installed it with this npm package. JSZip is unable to do so, complaining about corrupted zip or unexpected signature. There are many...

Google Calendar API V3: Identifying edited one-offs of recurring events?

I am currently listing all events from a Google Calendar using the "singleEvents" parameter set to true, which splits recurring events into individual events – which is good. However, I'm...

Flutter using a stream within another stream

I have a flutter project that uses firebase as a database. I am trying to get a list of document names via a stream, break it into sets of 10 to workaround the 10 comparison maximum for the...

Comparing objects using PAssert containsInAnyOrder in Apache Beam

While writing unit tests for my beam pipeline using PAssert, the pipeline outputs objects fine but the test fails during comparison with following assertion error: java.lang.AssertionError: Decode...

How to find keywords in a text file using python's sklearn

I want to create a way to optimize my resume using a python script. To do this, I am trying to find keywords used in the job listing that I can add to my resume to make it stand out when it is run...

Ignore property with list type with DeepEquals

I am using the DeepEqual library, to test if the results of a test match my expected output. I do the comparison simply as results.ShouldDeepEqual(expected); However, I don't know how to ignore a...

Beautiful Soup Web Scraper on Binance Announcement Page Lags behind by 5 minutes

I have built a web scraper using bs4, where the purpose is to get notifications when a new announcement is posted. At the moment I am testing this with the word 'list' instead of all announcement...

Is there a way to pass something more advanced like a method or a comparison to a function?

So I was trying to remake some Array.prototype functions from Javascript in Applescript. While trying to do that I noticed, that many Javascript functions use something that I think is called an...