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kandi X-RAY | wiki Summary
wiki is a self-hosted well uh wiki engine or content management system that lets you create and share content in Markdown format.
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QUESTION
customer_data.json (loaded as customer_data)
...ANSWER
Answered 2021-Jun-15 at 17:32I am trying to go through each of the books in
holds
usingholds[0]
,holds[1]
etc and test to see if the title is equal to a book title
Translated almost literally to Python:
QUESTION
I need a regex to find and insert anchor tags with a span child. e.g.
replace:
...ANSWER
Answered 2021-Jun-15 at 16:40This is not perfect because you could possibly nest anchors within each other and regexes are bad about keeping tracking of nested contexts. But a good 90% solution is to start by looking for . Then in a separate capturing group save everything up to and not including the next .
QUESTION
I am not sure how to extract multiple pages from a search result using Pythons Wikipedia plugin. Some advice would be appreciated.
My code so far:
...ANSWER
Answered 2021-Jun-15 at 13:10You have done the hard part, the results are already in the results
variable.
But the results need parsing by the wiki.page()
nethod, which only takes one argument.
The solution? Use a loop to parse all results one by one.
The easiest way will be using for loops, but the list comprehension method is the best.
Replace the last two lines with the following:
QUESTION
In the following code:
...ANSWER
Answered 2021-Feb-27 at 09:23There are 2 separate queues for handling of the callbacks. A macro and a micro queue. setTimeout
enqueues an item in the macro queue, while promise resolution - to the micro queue. The currently executing macro task(the main script itself in this case) is executed synchronously, line by line until it is finished. The moment it is finished, the loop executes everything queued in the microtask queue before continuing with the next item from the macro queue(which in your case is the console.log("hello")
queued from the setTimeout
).
Basically, the flow looks like this:
- Script starts executing.
MacrotaskQueue: [], MicrotaskQueue: [].
setTimeout(() => console.log("hello"), 0);
is encountered which leads to pushing a new item in the macrotask queue.
MacrotaskQueue: [console.log("hello")
], MicrotaskQueue: [].
Promise.resolve('Success!').then(console.log)
is read. Promise resolves toSuccess!
immediately andconsole.log
callback gets enqueued to the microtask queue.
MacrotaskQueue: [console.log("hello")
], MicrotaskQueue: [console.log('Success!')
].
- The script finishes executing so it checks if there is something in the microtask queue before proceeding with the next task from the macro queue.
console.log('Success!')
is pulled from the microtask queue and executed.
MacrotaskQueue: [console.log("hello")
], MicrotaskQueue: [].
- Script checks again if there is something else in the microtask queue. There is none, so it fetches the first available task from the macrotask queue and executes it, namely -
console.log("hello")
.
MacrotaskQueue: [], MicrotaskQueue: [].
- After the script finishes executing the
console.log("hello")
, it once again checks if there is anything in the microtask queue. It is empty, so it checks the macrotask queue. It is empty as well so everything queued is executed and the script finishes.
This is a simplified explanation, though, as it can get trickier. The microtask queue normally handles mainly promise callbacks, but you can enqueue code on it yourself. The newly added items in the microtask queue will still be executed before the next macrotask item. Also, microtasks can enqueue other microtasks, which can lead to an endless loop of processing microtasks.
Some useful reference resources:
QUESTION
Will I possibly loose any decimal digits (precision) when multiplying Number.MAX_SAFE_INTEGER
by Math.random()
in JavaScript?
I presume I won't but it'd be nice to have a credible explanation as to why 😎
Edited, In layman terms, we're dealing with two IEEE 754 double-precision floating-point numbers, one is the maximal integer (for double-precision), the other one is fractional with quite a few digits after a decimal point. What if (say) I first converted them to quadruple-precision format, then multiplied, and then converted the product back to double-precision, would the result be any different?
...ANSWER
Answered 2021-Jun-15 at 02:48Your implementation should be safe - in theory, all numbers between 0 and MAX_SAFE_INTEGER should have a possibility of appearing, if the engine implementing Math.random
uses a completely unbiased algorithm.
But an absolutely unbiased algorithm is not guaranteed by the specification - the numbers chosen are meant to be psuedo random, not truly, completely random. (does such a thing even exist? it's debatable...) Modern versions V8 and some other implementations use an algorithm with a period on the order of 2 ** 128, larger than MAX_SAFE_INTEGER (2 ** 53 - 1) - but it'd be completely plausible for other implementations (especially older ones) to have a much smaller period, resulting in certain integers within the range being picked much more often than others.
If this is important for your script (which is pretty unlikely in most situations, I'd think), you might consider using a higher-quality random generatior than Math.random
- but it's almost certainly not worth worrying about.
QUESTION
I had searched over 10 answers and nothing fits my current situation.
(member detector marcos comes from: http://en.wikibooks.org/wiki/More_C++_Idioms/Member_Detector)
...ANSWER
Answered 2021-Jun-15 at 08:44You would need the template parameter from the method for SFINAE:
QUESTION
I am revisiting C++ after a long hiatus, and I would like to use templates to design the known "map" function -- the one which applies a specified function to every element of some specified "iterable" object.
Disregarding the fact my map
doesn't return anything (a non-factor here), I have managed to implement what I wanted if the function passed to "map" does not need to accept additional arguments:
ANSWER
Answered 2021-Jun-13 at 20:41A simple way to fix this would be to deduce the non-type template parameter for the function, and reorder the template parameter list
QUESTION
I'm trying to create a pseudo-random generator API, but numbers generated by xorshift have unrandom nature. You can see the algorithm and tests here:
...ANSWER
Answered 2021-Jun-14 at 09:54You're looking at random numbers uniformly distributed between 0 and 18,446,744,073,709,551,615 (UINT64_MAX). All numbers between 10,000,000,000,000,000,000 and 18,446,744,073,709,551,615 start with a 1, so the skewed distribution is to be expected.
QUESTION
I have a line line intersection function (infinite lines) of which both lines are defined by two points.
It does not seem to find the correct intersection point but I don't know where I have gone wrong. I created the function following the math explanation on Wikipedia:
https://en.m.wikipedia.org/wiki/Line%E2%80%93line_intersection#Given_two_points_on_each_line
This is my attempt at making the function from the math:
...ANSWER
Answered 2021-Jun-14 at 02:43This line
QUESTION
I've juste add ppa:ondrej/php
on my ubuntu server, and it prompt me the message below.
Why am I advised to add ppa:ondrej/nginx
(stable) too? What's the exact purpose of this?
For information I have already installed Nginx from the official doc.
...ANSWER
Answered 2021-Feb-06 at 12:33According to the homepage for ppa:ondrej/nginx
, here the PPA description:
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