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Extract subset of key-value pairs from Python dictionary object?
...('l', 'm', 'n')}
If you're using Python 3, and you only want keys in the new dict that actually exist in the original one, you can use the fact to view objects implement some set operations:
{k: bigdict[k] for k in bigdict.keys() & {'l', 'm', 'n'}}
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Why does this async action hang?
I have a multi-tier .Net 4.5 application calling a method using C#'s new async and await keywords that just hangs and I can't see why.
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Copy tables from one database to another in SQL Server
...recreate any indexes and such. If the tables do exist, it will append the new data by default but you can adjust that (edit mappings) so it will delete all existing data.
I use this all the time and it works fairly well.
s...
Using bitwise OR 0 to floor a number
...rs are truncated and all non-numbers become 0).
– David Michael Gregg
Jan 3 '18 at 11:31
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Delete all lines beginning with a # from a file
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I have added a new answer which builds upon this answer.
– Acumenus
Oct 30 '13 at 16:19
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iPhone/iOS JSON parsing tutorial [closed]
...eful.
– Casey Flynn
Apr 28 '11 at 3:51
. Tutorial you mentioned requires DMG file but I could not find any DMG file on...
JavaScript data grid for millions of rows [closed]
... noticed that when having more than 120 columns or so - slickgrid puts the new rows in a new line. Can the maximum number of rows be set somewhere in the files?
– oneiros
Feb 25 '12 at 2:19
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Typedef function pointer?
... @user814628: It is not clear quite what you're asking. With typedef int newname, you are making newname into an alias for int. With typedef int (*func)(int), you are making func into an alias for int (*)(int) — a pointer to function taking an int argument and returning an int value.
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Accessing the web page's HTTP Headers in JavaScript
...t code to get all the HTTP headers by performing a get request:
var req = new XMLHttpRequest();
req.open('GET', document.location, false);
req.send(null);
var headers = req.getAllResponseHeaders().toLowerCase();
alert(headers);
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Why is creating a new process more expensive on Windows than Linux?
I've heard that creating a new process on a Windows box is more expensive than on Linux. Is this true? Can somebody explain the technical reasons for why it's more expensive and provide any historical reasons for the design decisions behind those reasons?
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