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efficient circular buffer?
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I would use collections.deque with a maxlen arg
>>> import collections
>>> d = collections.deque(maxlen=10)
>>> d
deque([], maxlen=10)
>>> for i in xrange(20):
... d.append(i)
...
>>> d
deque([10, 11, 12, 13, 14, 15, 16, 17, 18, 19], maxle...
How to check if a string contains a substring in Bash
...he * wildcards should be outside. Also note that a simple comparison operator is used (i.e. ==), not the regex operator =~.
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Regex for string contains?
What is the regex for simply checking if a string contains a certain word (e.g. 'Test')? I've done some googling but can't get a straight example of such a regex. This is for a build script but has no bearing to any particular programming language.
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How can I ensure that a division of integers is always rounded up?
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UPDATE: This question was the subject of my blog in January 2013. Thanks for the great question!
Getting integer arithmetic correct is hard. As has been demonstrated amply thus far, the moment you try to do a "clever" trick, odds are good that you've made a mistake. And when a flaw is found, ch...
How to use double or single brackets, parentheses, curly braces
...eses, curly braces in Bash, as well as the difference between their double or single forms. Is there a clear explanation?
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What is the difference between ~> and >= when specifying rubygem in Gemfile?
...preceding it in the string cannot be greater than what you provided. Thus for ~>0.8.5, any value is acceptable for the third digit (the 5) provided that it is greater than or equal to 5, but the leading 0.8 must be "0.8".
You might do this, for example, if you think that the 0.9 version is going...
Conventions for exceptions or error codes
Yesterday I was having a heated debate with a coworker on what would be the preferred error reporting method. Mainly we were discussing the usage of exceptions or error codes for reporting errors between application layers or modules.
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Why can't a 'continue' statement be inside a 'finally' block?
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finally blocks run whether an exception is thrown or not. If an exception is thrown, what the heck would continue do? You cannot continue execution of the loop, because an uncaught exception will transfer control to another function.
Even if no exception is thrown, finally ...
The type or namespace name does not exist in the namespace 'System.Web.Mvc'
Buiding MVC3 solution went well but have got an error in browser:
22 Answers
22
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Understanding exactly when a data.table is a reference to (vs a copy of) another data.table
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Yes, it's subassignment in R using <- (or = or ->) that makes a copy of the whole object. You can trace that using tracemem(DT) and .Internal(inspect(DT)), as below. The data.table features := and set() assign by reference to whatever object they are passed. So...