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Why is the order in dictionaries and sets arbitrary?
...and lets assume the table size is 8 slots. In Python 2.7, hash('foo') is -4177197833195190597, hash('bar') is 327024216814240868. Modulo 8, that means these two keys are slotted in slots 3 and 4 then:
>>> hash('foo')
-4177197833195190597
>>> hash('foo') % 8
3
>>> hash('ba...
Finding local maxima/minima with Numpy in a 1D numpy array
... a module function from numpy/scipy that can find local maxima/minima in a 1D numpy array? Obviously the simplest approach ever is to have a look at the nearest neighbours, but I would like to have an accepted solution that is part of the numpy distro.
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How to create a colored 1x1 UIImage on the iPhone dynamically?
I would like to create a 1x1 UIImage dynamically based on a UIColor.
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Get week of year in JavaScript like in PHP
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How does the bitwise complement operator (~ tilde) work?
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MQTT报文多个数据的提取 - App Inventor 2 拓展 - 清泛IT社区，为创新赋能！
...mqtt服务器并订阅主题，把对应的数据按顺序提取到标签1，标签2，标签3……我把画面和mqtt订阅的数据发上来，求解救！！
{
"RTValue": [
{
"name": "GQ-YIWANG-CHU-WD&...
How do you set, clear, and toggle a single bit?
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Setting a bit
Use the bitwise OR operator (|) to set a bit.
number |= 1UL << n;
That will set the nth bit of number. n should be zero, if you want to set the 1st bit and so on upto n-1, if you want to set the nth bit.
Use 1ULL if number is wider than unsigned long; promotion of 1UL <&...
Transpose/Unzip Function (inverse of zip)?
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MySQL ON vs USING?
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It is mostly syntactic sugar, but a couple differences are noteworthy:
ON is the more general ...