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How are multi-dimensional arrays formatted in memory?
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147
A static two-dimensional array looks like an array of arrays - it's just laid out contiguously...
How to test multiple variables against a value?
...bout the same comparison for all names here. You are looking for:
if x == 1 or y == 1 or z == 1:
x and y are otherwise evaluated on their own (False if 0, True otherwise).
You can shorten that using a containment test against a tuple:
if 1 in (x, y, z):
or better still:
if 1 in {x, y, z}:
...
What's the difference between “groups” and “captures” in .NET regular expressions?
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127
You won't be the first who's fuzzy about it. Here's what the famous Jeffrey Friedl has to say ...
[] and {} vs list() and dict(), which is better?
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198
In terms of speed, it's no competition for empty lists/dicts:
>>> from timeit import...
Detail change after Git pull
...ing to master. You can refer to the previous position of master by master@{1} (or even master@{10.minutes.ago}; see the specifying revisions section of the git-rev-parse man page), so that you can do things like
See all of the changes: git diff master@{1} master
See the changes to a given file: gi...
How to identify numpy types in python?
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116
Use the builtin type function to get the type, then you can use the __module__ property to fin...
How to initialize all members of an array to the same value?
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1276
Unless that value is 0 (in which case you can omit some part of the initializer
and the corre...
How to create NS_OPTIONS-style bitmask enumerations in Swift?
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Returning value from called function in a shell script
...also true for some other shells.
Here's how to do each of those options:
1. Echo strings
lockdir="somedir"
testlock(){
retval=""
if mkdir "$lockdir"
then # Directory did not exist, but it was created successfully
echo >&2 "successfully acquired lock: $lockdir"
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Efficient way to insert a number into a sorted array of numbers?
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