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Add a reference column migration in Rails 4
...L adapters are supported. Don't try this with other adapters like sqlite3, etc. Refer to Rails Guides: Foreign Keys for your reference.
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Reducing Django Memory Usage. Low hanging fruit?
...t of apache virtual hosts already in place, using SSL with apache already, etc. In this case, use mod_wsgi. If you are starting afresh, use spawning. NEVER use mod_python.
– nosklo
Jan 29 '09 at 10:23
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Max parallel http connections in a browser?
...reating some suspended connections to an HTTP server (comet, reverse ajax, etc). It works ok, but I see the browser only allows two suspended connections to a given domain simultaneously. So if a user is looking at my website in Tab1 of their browser, then also tries loading it in Tab2, they've used...
Test whether a list contains a specific value in Clojure
...ment. Accordingly, pipelines containing map, filter, remove, reduce, into, etc usually call for the ->> macro." But I guess the convention is more about functions that operate on sequences and return sequences.
– John Wiseman
Jun 6 '18 at 17:56
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Is arr.__len__() the preferred way to get the length of an array in Python?
...ents could still be length-checked. This includes strings, queues, trees, etc.
The functional nature of len() also lends itself well to functional styles of programming.
lengths = map(len, list_of_containers)
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No module named pkg_resources
...etuptools package via their package manager (apt-get install, yum install, etc.).
This issue can be highly dependent on your OS and dev environment. See the legacy/other answers below if the above isn't working for you.
Explanation
This error message is caused by a missing/broken Python setuptool...
How do I scroll to an element using JavaScript?
...onMcCluskie it's only the weird "scrollIntoViewOptions" (smooth scrolling, etc) that has exclusive firefox support. the basic use i have in my answer should work on almost anything.
– schpet
Jul 17 '15 at 2:41
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Convert integer into byte array (Java)
...er what size the input integer is. If you only want 2 bytes, use putShort, etc ...
– bvdb
Jan 26 '15 at 9:07
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Android SDK installation doesn't find JDK
... leave a note for those seeking for another way (without registry hacking, etc.) to solve this on a Windows 64 bit system. Just add PATH (capital letters!!) to your environment Variables and set the value to your JDK-Path.
I added JDK to the existing "Path" which did not work, like it didn't with J...
Python subprocess/Popen with a modified environment
...y set an environment variable without having to copy the os.envrion object etc, I do this:
process = subprocess.Popen(['env', 'RSYNC_PASSWORD=foobar', 'rsync', \
'rsync://username@foobar.com::'], stdout=subprocess.PIPE)
sh...