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Why does ConcurrentHashMap prevent null keys and values?
...t nulls aren't allowed in ConcurrentMaps
(ConcurrentHashMaps, ConcurrentSkipListMaps) is that ambiguities that
may be just barely tolerable in non-concurrent maps can't be
accommodated. The main one is that if map.get(key) returns null, you
can't detect whether the key explicitly maps to nul...
How do I disable a Pylint warning?
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pylint --generate-rcfile shows it like this:
[MESSAGES CONTROL]
# Enable the message, report, category or checker with the given id(s). You can
# either give multiple identifier separated by comma (,) or put this option
# multiple time.
#enable=
# Disable th...
How to reload a page using JavaScript
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Difference between __getattr__ vs __getattribute__
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A key difference between __getattr__ and __getattribute__ is that __getattr__ is only invoked if the attribute wasn't found the usual ways. It's good for implementing a fallback for missing attributes, and is probably the one ...
throws Exception in finally blocks
...there an elegant way to handle exceptions that are thrown in finally block?
15 Answers
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Correct Bash and shell script variable capitalization
...tion avoids accidentally overriding environmental and internal variables.
Keeping to this convention, you can rest assured that you don't need to know every environment variable used by UNIX tools or shells in order to avoid overwriting them. If it's your variable, lowercase it. If you export it,...
See line breaks and carriage returns in editor
Does anyone know of a text editor on Linux that allows me to see line breaks and carriage returns? Does Vim support this feature?
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Why do people still use primitive types in Java?
...; i++) {
sum += i;
}
System.out.println(sum);
}
and it takes 43 seconds to run. Taking the Long into the primitive brings it down to 6.8 seconds... If that's any indication why we use primitives.
The lack of native value equality is also a concern (.equals() is fairly verbose comp...
What is the default form HTTP method?
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It's GET.
Take a look W3C Superceded Recommendation 17.3 The FORM element.
Excerpt:
<!ATTLIST FORM
%attrs; -- %coreattrs, %i18n, %events --
action %URI; #REQUIRED -- server-side form h...
Prevent nginx 504 Gateway timeout using PHP set_time_limit()
...n usual. set_time_limit(0) does not seem to prevent that! Does it not work when running php5-fpm on nginx? If so, whats the proper way of setting the time limit?
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