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What do I use for a max-heap implementation in Python?
... amazed that there IS such a built-in solution in heapq. But then it is totally unreasonable that it is NOT even slightly mentioned at all in the official document! WTF!
– RayLuo
Apr 21 '15 at 6:48
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How do you use “
...ne:
A closure is a function written by another function. Closures are so called because they enclose the environment of the parent function, and can access all variables and parameters in that function. This is useful because it allows us to have two levels of parameters. One level of parameters (t...
Officially, what is typename for?
On occasion I've seen some really indecipherable error messages spit out by gcc when using templates... Specifically, I've had problems where seemingly correct declarations were causing very strange compile errors that magically went away by prefixing the typename keyword to the beginning of the...
Undo a merge by pull request?
...erge, but I noticed that it merged in a bunch of commits. So now there are all these commits from this person from days before the merge. How do you undo this?
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What is the purpose of the HTML “no-js” class?
...f/else statement in your CSS code. For example, .myclass { /* CSS code for all versions of your page goes here */ }, .js .myclass { /* This CSS code will only show up if JS is enabled */ } and .no-js .myclass { /* This CSS code will only show up if JS is disabled. */ }. Hope this helps. -Nick
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How to grep a string in a directory and all its subdirectories? [duplicate]
How to grep a string or a text in a directory and all its subdirectories'files in LINUX ??
2 Answers
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Naming convention for unique constraint
...primary key and foreign key have commonly used and obvious conventions ( PK_Table and FK_Table_ReferencedTable , respectively). The IX_Table_Column naming for indexes is also fairly standard.
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what does the __file__ variable mean/do?
I usually just hard-wire these with the actual path. But there is a reason for these statements that determine path at runtime, and I would really like to understand the os.path module so that I can start using it.
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Do regular expressions from the re module support word boundaries (\b)?
...;> x = 'one two three'
>>> y = k.search( x)
>>> y
<_sre.SRE_Match object at 0x100418850>
Also forgot to mention, you should be using raw strings in your code
>>> x = 'one two three'
>>> y = re.search(r"\btwo\b", x)
>>> y
<_sre.SRE_Match obj...
What does auto&& tell us?
...value or rvalue expression and I will preserve its constness. This is typically used for forwarding (usually with T&&). The reason this works is because a "universal reference", auto&& or T&&, will bind to anything.
You might say, well why not just use a const auto& beca...