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How to get the parent dir location
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os.pardir is a better way for ../ and more readable.
import os
print os.path.abspath(os.path.join(given_path, os.pardir))
This will return the parent path of the given_path
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Create singleton using GCD's dispatch_once in Objective-C
...the low-level details can give you insights into powerful new ways to transform Objective-C.
Refer here: instancetype
+ (instancetype)sharedInstance
{
static dispatch_once_t once;
static id sharedInstance;
dispatch_once(&once, ^
{
sharedInstance = [self new];
}); ...
Fixed size queue which automatically dequeues old values upon new enques
I'm using ConcurrentQueue for a shared data structure which purpose is holding the last N objects passed to it (kind of history).
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Counting inversions in an array
I'm designing an algorithm to do the following: Given array A[1... n] , for every i < j , find all inversion pairs such that A[i] > A[j] . I'm using merge sort and copying array A to array B and then comparing the two arrays, but I'm having a difficult time seeing how I can use this to find...
How do you loop through currently loaded assemblies?
...g assemblies that are referenced, but not present in the current directory for some reason. This is incredibly useful when using MEF. The return list will give you both the missing assembly, and who owns it (its parent).
/// <summary>
/// Intent: Get referenced assemblies, either recursiv...
What is the worst gotcha in C# or .NET? [closed]
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and SO appropriate for this site :)
– gbjbaanb
Oct 27 '08 at 23:18
62
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How do I call setattr() on the current module?
...s the index in that vector, not a name lookup. To defeat the optimization, forcing the dict you desire to exist, start the function with exec '': time a function with a couple substantial loops each way, and you'll see the importance of this core optimization to Python's performance.
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Updating MySQL primary key
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Is there a built-in function to print all the current properties and values of an object?
So what I'm looking for here is something like PHP's print_r function.
25 Answers
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multiprocessing.Pool: When to use apply, apply_async or map?
I have not seen clear examples with use-cases for Pool.apply , Pool.apply_async and Pool.map . I am mainly using Pool.map ; what are the advantages of others?
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