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How to avoid explicit 'self' in Python?

...s leads to useful properties, such as: you can't add members which accidentally shadow non-members and thereby break code. One extreme example: you can write a class without any knowledge of what base classes it might have, and always know whether you are accessing a member or not: class A(some_fu...
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How do I get a PHP class constructor to call its parent's parent's constructor?

I need to have a class constructor in PHP call its parent's parent's (grandparent?) constructor without calling the parent constructor. ...
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Use numpy array in shared memory for multiprocessing

... To add to @unutbu's (not available anymore) and @Henry Gomersall's answers. You could use shared_arr.get_lock() to synchronize access when needed: shared_arr = mp.Array(ctypes.c_double, N) # ... def f(i): # could be anything numpy accepts as an index such another numpy array with ...
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How to shuffle a std::vector?

...n Coliru Make sure to reuse the same instance of rng throughout multiple calls to std::shuffle if you intend to generate different permutations every time! Moreover, if you want your program to create different sequences of shuffles each time it is run, you can seed the constructor of the random e...
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Explaining Python's '__enter__' and '__exit__'

... Using these magic methods (__enter__, __exit__) allows you to implement objects which can be used easily with the with statement. The idea is that it makes it easy to build code which needs some 'cleandown' code executed (think of it as a try-finally block). Some more ex...
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string sanitizer for filename

...a whitelist of characters you are happy to be used? For example, you could allow just good ol' a-z, 0-9, _, and a single instance of a period (.). That's obviously more limiting than most filesystems, but should keep you safe. ...
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How to sort two lists (which reference each other) in the exact same way

...s problem is to use the "decorate, sort, undecorate" idiom, which is especially simple using python's built-in zip function: >>> list1 = [3,2,4,1, 1] >>> list2 = ['three', 'two', 'four', 'one', 'one2'] >>> list1, list2 = zip(*sorted(zip(list1, list2))) >>> list1 ...
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One-liner to check whether an iterator yields at least one element?

... Similarly if you need to check if the iterator is empty, one could use all(False for _ in iterator) will check if the iterator is empty. (all returns True if the iterator is empty, otherwise it stops when it sees the first False element) – KGardevoir Apr 3 ...
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No ConcurrentList in .Net 4.0?

...read-safe, limited subset of IList<T>: in particular, one that would allow an Add and provide random read-only access by index (but no Insert, RemoveAt, etc., and also no random write access). This was the goal of my ConcurrentList<T> implementation. But when I tested its performance in...
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How do you write tests for the argparse portion of a python module? [closed]

...turn parser.parse_args(args) Then in your main function you should just call it with: parser = parse_args(sys.argv[1:]) (where the first element of sys.argv that represents the script name is removed to not send it as an additional switch during CLI operation.) In your tests, you can then call...