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Why were pandas merges in python faster than data.table merges in R in 2012?
...re-computed indexes for various columns to accelerate operations like data selection and merges. In this case (database joins) pandas' DataFrame contains no pre-computed information that is being used for the merge, so to speak it's a "cold" merge. If I had stored the factorized versions of the join...
How to uninstall Python 2.7 on a Mac OS X 10.6.4?
...thonProfileChanges-2.7
org.python.Python.PythonUnixTools-2.7
you can now select which packages you will unlink (remove).
This is the unlink documentation:
--unlink package-id
Unlinks (removes) each file referenced by package-id. WARNING: This command makes no attempt to perform re...
What database does Google use?
... with different time stamps. The time stamp allows for operations such as "select 'n' versions of this Web page" or "delete cells that are older than a specific date/time."
In order to manage the huge tables, Bigtable splits tables at row boundaries and saves them as tablets. A tablet is around 20...
Adding a guideline to the editor in Visual Studio
..., install the Editor Guidelines plugin, then right-click in the editor and select this:
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How to overload std::swap()
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@DaveAbrahams: The partial ordering is to select the function template to specialize when the explicit specialization matches more than one. The ::swap overload you added is more specialized than the std::swap overload for vector, so it captures the call and no spec...
Mac zip compress without __MACOSX folder?
...p -d "$p" \*/.DS_Store || true
done
Create a new Service with Automator
Select "Files and Folders" in "Finder"
Add a "Shell Script Action"
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Reverting to a specific commit based on commit id with Git? [duplicate]
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@bwawok: But it's faster to select and middle-click-paste than to type even an abbreviated SHA1!
– Cascabel
Sep 3 '10 at 20:19
9
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How to store a list in a column of a database table
... the names that you have given to your girl friend id 1 then you can use:
select names from nicknames where id = 1;
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Jquery If radio button is checked
...' of "appended" to the 'appended' element
appended.id = 'appended';
// 1. selects '<input type="radio" />' elements with the 'name' attribute of 'postage'
// 2. assigns the onChange/onchange event handler
$('input:radio[name="postage"]').change(
function(){
// checks that the cli...
How to prettyprint a JSON file?
... end up with maps whose keys are u"some-key" (python unicode), which makes selecting fields more difficult and doesn't really go in the direction of pretty-printing.
You can also use jq:
jq . some.json
and you get colors as a bonus (and way easier extendability).
Addendum: There is some confusi...