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How do I get a substring of a string in Python?
...or unicode (Py2), a = b[:] is equivalent to a = b, it just wastes a little time dispatching the slicing byte codes which the object responds to by returning itself since it's pointless to shallow copy when, aside from object identity tests, it's equivalent to just return another reference to one's i...
How do I remove all non alphanumeric characters from a string except dash?
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@MGOwen because every time you use "" you are creating a new object due to strings being immutable. When you use string.empty you are reusing the single instance required for representing an empty string which is quicker as well as being more effi...
How to check if a string in Python is in ASCII?
...s a bytestring 'é' (Python 2 syntax, Python 3 hadn't been released at the time) and therefore .decode() is correct.
– jfs
Sep 4 '15 at 10:36
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Is there a way to auto expand objects in Chrome Dev Tools?
EVERY SINGLE TIME I view an object in the console I am going to want to expand it, so it gets tiresome to have to click the arrow to do this EVERY SINGLE TIME :) Is there a shortcut or setting to have this done automatically?
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Cartesian product of x and y array points into single array of 2D points
... the suggestion to use numpy.result_type.
Notable alternatives
It's sometimes faster to write contiguous blocks of memory in Fortran order. That's the basis of this alternative, cartesian_product_transpose, which has proven faster on some hardware than cartesian_product (see below). However, Paul...
Understanding reference counting with Cocoa and Objective-C
...stand the basic concepts.
In Cocoa, each object keeps track of how many times it is being referenced (specifically, the NSObject base class implements this). By calling retain on an object, you are telling it that you want to up its reference count by one. By calling release, you tell the objec...
Why is x86 ugly? Why is it considered inferior when compared to others? [closed]
...s progenitors were 8086s, after all)
x86 has evolved significantly several times, but hardware is required to maintain backwards compatibility with old binaries. For example, modern x86 hardware still contains support for running 16 bit code natively. Additionally, several memory-addressing models e...
Reading binary file and looping over each byte
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@usr: the performance difference can be as much as 200 times for the code I've tried.
– jfs
Nov 16 '13 at 4:56
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What's invokedynamic and how do I use it?
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Some time ago, C# added a cool feature, dynamic syntax within C#
Object obj = ...; // no static type available
dynamic duck = obj;
duck.quack(); // or any method. no compiler checking.
Think of it as syntax sugar for reflectiv...
What is the easiest way to get current GMT time in Unix timestamp format?
Python provides different packages ( datetime , time , calendar ) as can be seen here in order to deal with time. I made a big mistake by using the following to get current GMT time time.mktime(datetime.datetime.utcnow().timetuple())
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