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JavaScript pattern for multiple constructors
I need different constructors for my instances. What is a common pattern for that?
9 Answers
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How can I filter a date of a DateTimeField in Django?
...te operator. Check "#9596 Comparing a DateTimeField to a date is too hard" for more details.
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Best way to require all files from a directory in ruby?
... It's probably safer to use File.join rather than making assumptions about forward/backward slashes: Dir[File.join(File.dirname(__FILE__), 'lib', '*.rb')].each {|file| require file }
– Chris
Jul 6 '12 at 23:22
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Why can't I use a list as a dict key in python?
I'm a bit confused about what can/can't be used as a key for a python dict.
11 Answers
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Does Python support short-circuiting?
... soon as a True is encountered and returns True.
>>> any(fun(i) for i in [1, 2, 3, 4]) # bool(1) = True
executed
True
>>> any(fun(i) for i in [0, 2, 3, 4])
executed # bool(0) = False
executed # bool(2) = True
True
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How to determine a Python variable's type?
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You may be looking for the type() built-in function.
See the examples below, but there's no "unsigned" type in Python just like Java.
Positive integer:
>>> v = 10
>>> type(v)
<type 'int'>
Large positive integer:
&g...
Random Gaussian Variables
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Jarrett's suggestion of using a Box-Muller transform is good for a quick-and-dirty solution. A simple implementation:
Random rand = new Random(); //reuse this if you are generating many
double u1 = 1.0-rand.NextDouble(); //uniform(0,1] random doubles
double u2 = 1.0-rand...
Should __init__() call the parent class's __init__()?
...er method is not strictly necessary, since the super method is empty. Same for __del__.
On the other hand, for __new__, you should indeed call the super method, and use its return as the newly-created object - unless you explicitly want to return something different.
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UICollectionView Set number of columns
...greater control over the layout of your UICollectionView, without the need for subclassing it:
collectionView:layout:insetForSectionAtIndex:
collectionView:layout:minimumInteritemSpacingForSectionAtIndex:
collectionView:layout:minimumLineSpacingForSectionAtIndex:
collectionView:layout:referenceSiz...
What to put in a python module docstring? [closed]
... I've read both PEP 8 and PEP 257 , and I've written lots of docstrings for functions and classes, but I'm a little unsure about what should go in a module docstring. I figured, at a minimum, it should document the functions and classes that the module exports, but I've also seen a few modules t...