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Python's “in” set operator
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101
Yes, but it also means hash(b) == hash(x), so equality of the items isn't enough to make them t...
PhpStorm wrap/surround selection?
... -> Surround selection on typing quote or brace.
Update (for PhpStorm 2016)
For PhpStorm Version 2016, use Cmd + Alt + S (on Mac) or Ctrl + Alt + S (on Win) to go to Settings. Tick on checkbox of Settings -> Editor -> General -> Smart Keys -> Surround selection on typing quote or b...
Difference between web reference and service reference?
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102
The low-level answer here is that a Web Reference will create a client proxy class that allows ...
Android SharedPreference security
...Application Security for the Android Platform, just published in December 2011 (disclaimer: I'm the author of this book).
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Difference between reduce and foldLeft/fold in functional programming (particularly Scala and Scala
...mmutative and associative binary operator"
http://spark.apache.org/docs/1.0.0/api/scala/index.html#org.apache.spark.rdd.RDD
Here is proof that reduce is NOT just a special case of foldLeft
scala> val intParList: ParSeq[Int] = (1 to 100000).map(_ => scala.util.Random.nextInt()).par
scala>...
Add new item count to icon on button - Android
...k/res/android"
android:shape="oval">
<solid
android:color="#F00" />
<stroke
android:width="2dip"
android:color="#FFF" />
<padding
android:left="5dip"
android:right="5dip"
android:top="5dip"
android:bottom="5dip" />
</shape>
You'll have...
How to create duplicate allowed attributes
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answered Feb 16 '09 at 14:59
Anton GogolevAnton Gogolev
105k3636 gold badges187187 silver badges274274 bronze badges
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Run a callback only if an attribute has changed in Rails
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200
Rails 5.1+
class Page < ActiveRecord::Base
before_save :do_something, if: :will_save_chan...
How to hide output of subprocess in Python 2.7
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440
Redirect the output to DEVNULL:
import os
import subprocess
FNULL = open(os.devnull, 'w')
retc...
Why are trailing commas allowed in a list?
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+50
The main advantages are that it makes multi-line lists easier to edit and that it reduces clutter in diffs.
Changing:
s = ['manny',
...