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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...
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...
Reading binary file and looping over each byte
...
@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 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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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...
How can I get the current date and time in the terminal and set a custom command in the terminal for
I have to check the time in a Linux terminal.
2 Answers
2
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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...
Removing a list of characters in string
...
d = {ord(c):None for c in chars}
return subj.translate(d)
import timeit, sys
def profile(f):
assert f(subj, chars_to_remove) == test
t = timeit.timeit(lambda: f(subj, chars_to_remove), number=1000)
print ('{0:.3f} {1}'.format(t, f.__name__))
print (sys.version)
PYTHON2 = sys....
Big-O for Eight Year Olds? [duplicate]
... to my code. I understand the concepts mathematically, I just have a hard time wrapping my head around what they mean conceptually. For example, if one were to perform an O(1) operation on a data structure, I understand that the number of operations it has to perform won't grow because there are m...
Using Case/Switch and GetType to determine the object [duplicate]
...s is a fairly expensive pattern that leads to a relatively large amount of time in GC. But still, very readable...
– JoeGeeky
Nov 2 '10 at 9:50
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