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Serializing class instance to JSON
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The basic problem is that the JSON encoder json.dumps() only knows how to serialize a limited set of object types by default, all built-in types. List here: https://docs.python.org/3.3/library/json.html#encoders-and-decoders
One good solution would be to make your class inherit from J...
Xcode — what is $(SRCROOT)?
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Xcode Help documentation is now version based. Updated link for Xcode 8.3 Build Settings reference.
– SwiftArchitect
May 2 '17 at 19:32
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Creating a copy of a database in PostgreSQL [closed]
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I know this is an old Q/A, but I feel it needs clarification: When @synecdoche says that originaldb must be idle, that means no write possibility at all. "Copying" a database in this fashion does not lock originaldb. PostgreSQL ...
Open an IO stream from a local file or url
I know there are libs in other languages that can take a string that contains either a path to a local file or a url and open it as a readable IO stream.
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How to create a file in memory for user to download, but not through server?
...rompt the user to download it, without any interaction with the server?
I know I can't write directly to their machine (security and all), but can I create and prompt them to save it?
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Quick unix command to display specific lines in the middle of a file?
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I found two other solutions if you know the line number but nothing else (no grep possible):
Assuming you need lines 20 to 40,
sed -n '20,40p;41q' file_name
or
awk 'FNR>=20 && FNR<=40' file_name
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Why should a Java class implement comparable?
...m.add(3);
m.add(2);
for (Integer i : m)
... // values will be sorted
But now suppose I have some custom object, where sorting makes sense to me, but is undefined. Let's say, I have data representing districts by zipcode with population density, and I want to sort them by density:
public class Dis...
MSSQL Error 'The underlying provider failed on Open'
I was using an .mdf for connecting to a database and entityClient . Now I want to change the connection string so that there will be no .mdf file.
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How to update npm
...nload/
For historical understanding: Chis Lea was maintaining his PPA but now joined forces with nodesource.
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jQuery object equality
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If you still don't know, you can get back the original object by:
alert($("#deviceTypeRoot")[0] == $("#deviceTypeRoot")[0]); //True
alert($("#deviceTypeRoot")[0] === $("#deviceTypeRoot")[0]);//True
because $("#deviceTypeRoot") also returns an...