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Why use symbols as hash keys in Ruby?
...ly stored once.
Symbols in Ruby are basically "immutable strings" .. that means that they can not be changed, and it implies that the same symbol when referenced many times throughout your source code, is always stored as the same entity, e.g. has the same object id.
Strings on the other hand are...
Use numpy array in shared memory for multiprocessing
... the parent's memory space. In the context of Python multiprocessing, this means it shares all module-level variables; note that this does not hold for arguments that you explicitly pass to your child processes or to the functions you call on a multiprocessing.Pool or so.
A simple example:
import ...
CSS last-child(-1)
...last-of-type() I don't know what else you could use. I'm not sure what you mean by "dynamic", but if you mean whether the style applies to the new second last child when more children are added to the list, yes it will. Interactive fiddle.
ul li:nth-last-child(2)
...
Does a finally block run even if you throw a new Exception?
...
What do you mean here by "The thread running the try-catch-finally block is [...] interrupted"? Perhaps that documentation is poorly worded, but Thread.interrupt() will not cause the finally block to be skipped, whether thrown from the t...
Cannot create or edit Android Virtual Devices (AVD) from Eclipse, ADT 22.6
... and promises to fix by upcoming versions of ADT (22.6.1 - 22.6.3). At the mean time I would suggest to roll-back ADT to a lower version version 22.3.0
To uninstall current ADT go to
Help --> About Eclipse --> Installation Details --> Android Development Tools --> Uninstall
I may su...
Removing input background colour for Chrome autocomplete?
...tion of adding a transition works, but having to set a duration/delay will mean that at some point it may show again.
My solution is to use keyframes instead, that way it will always show the colours of your choosing.
@-webkit-keyframes autofill {
0%,100% {
color: #666;
backgro...
add a string prefix to each value in a string column using Pandas
...
%timeit df['col'].apply(lambda x: f"str{x}")
117 ms ± 451 µs per loop (mean ± std. dev. of 7 runs, 10 loops each)
%timeit 'str' + df['col'].astype(str)
112 ms ± 1.04 ms per loop (mean ± std. dev. of 7 runs, 10 loops each)
Using format, however, is indeed far slower:
%timeit df['col'].appl...
Flexbox and Internet Explorer 11 (display:flex in ?)
...
I think that means IE10 needs -ms-flex: 1 0 0; and IE11 flex: 1 0 0;..?
– Eystein
Nov 10 '14 at 11:26
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When to use wrapper class and primitive type
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The builder pattern is meant to get around this. In this scenario, you make a PersonBuilder that throws an exception if SSN isn't set prior to calling "build" to get the Person instance. I think this sort of thing is excessive, but it's what the Ja...
Targeting only Firefox with CSS
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What exactly does the url-prefix() mean after the "@-moz-document" ? just curious.
– Matt
Jul 13 '11 at 16:59
17
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