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Django ManyToMany filter()

...many examples of FOO__in=... style filters in the many-to-many and many-to-one tests. Here is syntax for your specific problem: users_in_1zone = User.objects.filter(zones__id=<id1>) # same thing but using in users_in_1zone = User.objects.filter(zones__in=[<id1>]) # filtering on a few...
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What is the purpose of the -m switch?

...ython's primary organizational unit is known as a module. Module's come in one of two flavors: code modules and package modules. A code module is any file that contains python executable code. A package module is a directory that contains other modules (either code modules or package modules). The m...
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unix - head AND tail of file

...e.g. output from a command), you can use 'tee' to fork the stream and send one stream to head and one to tail. This requires using either the '>( list )' feature of bash (+ /dev/fd/N): ( COMMAND | tee /dev/fd/3 | head ) 3> >( tail ) or using /dev/fd/N (or /dev/stderr) plus subshells wit...
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release Selenium chromedriver.exe from memory

...river.exe from memory (I'm on Windows 7). However after each run there is one chromedriver.exe instance remain in the memory. I hope there is a way I can write something in python to kill the chromedriver.exe process. Obviously browser.close() doesn't do the work. Thanks. ...
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Constructor initialization-list evaluation order

...nts. I had assumed that they were constructed in the order listed, but in one case it appears they were being constructed in reverse resulting in an abort. When I reversed the arguments the program stopped aborting. This is an example of the syntax I'm using. The thing is, a_ needs to be initiali...
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Why do == comparisons with Integer.valueOf(String) give different results for 127 and 128?

... @user3152527: There's a sizable difference - one is considered an object, which means you can call methods and interact with it in abstract data structures, like List. The other is a primitive, which is just a raw value. – Makoto ...
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What can MATLAB do that R cannot do? [closed]

... functions. Here are some of the things that I've observed in the past, none of which should be deal-breakers. Generally, MATLAB has a better programming environment (e.g. better documentation, better debuggers, better object browser) and is "easier" to use (you can use MATLAB without doing any ...
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Why 0 is true but false is 1 in the shell?

... It's a convention, but a particularly useful one when you think about it. In general, if a program succeeds that's all you need to know. If it fails, however, you might need to know all kinds of information about the failure - why it happened, how to fix it, etc. Havi...
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How can I tell if my server is serving GZipped content?

... It looks like one possible answer is, unsurprisingly, curl: $ curl http://example.com/ --silent --write-out "%{size_download}\n" --output /dev/null 31032 $ curl http://example.com/ --silent -H "Accept-Encoding: gzip,deflate" --write-out "...
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CSS for grabbing cursors (drag & drop)

... cursors in a comma-delimited list and the user agent should use the first one it understands. So you can use the -moz* ones and "move" as a fallback. – mu is too short Apr 18 '11 at 7:15 ...