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Why does comparing strings using either '==' or 'is' sometimes produce a different result?
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is is identity testing, == is equality testing. what happens in your code would be emulated in the interpreter like this:
>>> a = 'pub'
>>> b = ''.join(['p', 'u', 'b'])
>>> a == b
True
>>> a is ...
Postgres and Indexes on Foreign Keys and Primary Keys
...ndexes on primary keys and unique constraints, but not on the referencing side of foreign key relationships.
When Pg creates an implicit index it will emit a NOTICE-level message that you can see in psql and/or the system logs, so you can see when it happens. Automatically created indexes are visi...
Where to put model data and behaviour? [tl; dr; Use Services]
... To make this example more DCI like shouldn't the data be outside of ListService?
– PiTheNumber
Sep 20 '13 at 20:37
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How do I enable standard copy paste for a TextView in Android?
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Try android:textIsSelectable.
i.e., android:textIsSelectable="true"
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How to get a string after a specific substring?
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you get distinct id's (that are separated by several thousand) ... im not sure you dont create unneccessary substrings with this
– Joran Beasley
Dec 27 '18 at 5:28
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How to avoid mysql 'Deadlock found when trying to get lock; try restarting transaction'
...etime <= now() - INTERVAL 900 SECOND
To
DELETE FROM onlineusers
WHERE id IN (
SELECT id FROM onlineusers
WHERE datetime <= now() - INTERVAL 900 SECOND
ORDER BY id
) u;
Another thing to keep in mind is that mysql documentation suggest that in case of a deadlock the client should...
Change a Django form field to a hidden field
...alue.
also you may prefer to use in the view:
form.fields['field_name'].widget = forms.HiddenInput()
but I'm not sure it will protect save method on post.
Hope it helps.
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Remove all the children DOM elements in div
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@david-chu-ca - probably the later answer by Eugene (a primary author of the dojo GFX library) should be marked as the accepted answer. Eugene - thanks for clarification.
– robocat
Jul 24 '1...
Escape text for HTML
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Didn't see this here
System.Web.HttpUtility.JavaScriptStringEncode("Hello, this is Satan's Site")
it was the only thing that worked (asp 4.0+) when dealing with html like this. The&apos; gets rendered as ' (using htmlde...
What's a correct and good way to implement __hash__()?
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Aside from the minor overhead from factoring out the __key function, this is about as fast as any hash can be. Sure, if the attributes are known to be integers, and there aren't too many of them, I suppose you could potentially...