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How does grep run so fast?

...ality of GREP in shell, earlier I used to use substring method in java but now I use GREP for it and it executes in a matter of seconds, it is blazingly faster than java code that I used to write.(according to my experience I might be wrong though) ...
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Python class inherits object

...problem… Python introduced new-style classes back in Python 2.2, and by now old-style classes are really quite old. Discussion of old-style classes is buried in the 2.x docs, and non-existent in the 3.x docs. The problem is, the syntax for old-style classes in Python 2.x is the same as the alter...
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Why is using a wild card with a Java import statement bad?

...IDE (since your argument is that I shouldn't have to use one), how will I know which package Foo came from? Sure, using an IDE, the IDE will tell me, but your entire argument is that I should be able to read the code without one. Doing explicit imports help document the code (great reason to avoid w...
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Automatic prune with Git fetch or pull

If someone deleted a remote branch because the work is over and I don't know, I won't do a git fetch --prune and eventually I will push back the deleted branch. ...
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How do MySQL indexes work?

... The first thing you must know is that indexes are a way to avoid scanning the full table to obtain the result that you're looking for. There are different kinds of indexes and they're implemented in the storage layer, so there's no standard between t...
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How can I capitalize the first letter of each word in a string?

...urn re.sub("(^|\s)(\S)", lambda m: m.group(1) + m.group(2).upper(), s) Now, these are some other answers that were posted, and inputs for which they don't work as expected if we are using the definition of a word being the start of the sentence or anything after a blank space: return s.title(...
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std::next_permutation Implementation Explanation

...s to go (ie we can "increase" the permutation by a smaller amount). Let's now go back to the code: while (true) { It j = i; --i; if (*i < *j) { // ... } if (i == begin) { // ... } } From the first 2 lines in the loop, j is an element and i is the element befo...
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Specify width in *characters*

...22 px, where 20px is the height of the font, and 2px are for line height. Now since em and ex are of no use here, a possible strategy for a CSS-only solution would be to Create an element containing just a   Let it autosize itself Place your div within and Make it 10 times as large as t...
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Why does Python pep-8 strongly recommend spaces over tabs for indentation?

...ogrammers choose to use spaces before PEP-8? That's what I really want to know. The advantages of tabs seem obvious to me, but not spaces. – einnocent Mar 1 '14 at 0:40 12 ...
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Sublime Text 2: Trim trailing white space on demand

I know that Sublime Text 2 can delete the trailing white space on files upon saving. 5 Answers ...