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Python argparse: default value or specified value
...ring as default) and "" (empty string as entered by user). In the code for now I'm using the default and since I need to do some ops, I have something like this self.foo = (args.bar or some_else_source).upper(). It will break on None object AFAIUC.
– 0andriy
Au...
augmented reality framework [closed]
...o develop an augmented reality application for Android phone. Does anyone know if there is any existing framework for augmented reality which could be used for such applications?
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A reference to the dll could not be added
...it using regsvr32
That seems to be the answer to my original question for now.
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String comparison in bash. [[: not found
... Happend to me because i ran the script with sh, lots for frustration. Now i just have to redo everything i undid before finding this answer.
– Louis Loudog Trottier
May 16 '18 at 5:01
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Why cast unused return values to void?
...s the motivation for this, to explicitly show other "developers" that you know this function returns but you're explicitly ignoring it.
This is a way to ensure that where necessary error codes are always handled.
I think for C++ this is probably the only place that I prefer to use C-style casts to...
java.lang.NoClassDefFoundError: Could not initialize class XXX
...InitializeStaticPartOfClassError or something. Then we as developer would know where to look.
– Maarten
Nov 14 '18 at 11:12
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How to Get Element By Class in JavaScript?
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Of course, all modern browsers now support the following simpler way:
var elements = document.getElementsByClassName('someClass');
but be warned it doesn't work with IE8 or before. See http://caniuse.com/getelementsbyclassname
Also, not all browsers wi...
Return a `struct` from a function in C
...function body as soon as the amount of memory allocated for a value isn't known at compile time. It is for structs, so C functions have no problem returning them.
– reinierpost
Feb 1 '15 at 19:11
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Is there a way to access the “previous row” value in a SELECT statement?
...from table t1, table t2
where t1.primaryKey = t2.primaryKey - 1
If you know how to order things but not how to get the previous value given the current one (EG, you want to order alphabetically) then I don't know of a way to do that in standard SQL, but most SQL implementations will have extensio...
Run cron job only if it isn't already running
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Use flock. It's new. It's better.
Now you don't have to write the code yourself. Check out more reasons here: https://serverfault.com/a/82863
/usr/bin/flock -n /tmp/my.lockfile /usr/local/bin/my_script
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