Can I or SHOULD I find an object by the object_id attribute in ruby?
When I make a new object, let's say o = Object.new This object has an id, o.object_id #=> ######## I also make several other objects, using the Object class. What would be the best way to have ruby find the object 'o' by using the object_id attribute? I am thinking in terms of something like search_id = o.object_id search_result = Object.find(search_id) Where 'search_results' would be the object c
Extension method for python built-in types
is it possible to add extension method to python built-in types? I know that I can add extension method to defined type by simply adding new method by . as following: class myClass: pass myClass.myExtensionMethod = lambda self,x:x * 2 z = myClass() print z.myExtensionMethod(10) But is any way to adding extension method to python built'in types like list, dict, ... list.myExtension = lambda self,x:
Simple way to calculate median with MySQL
What's the simplest (and hopefully not too slow) way to calculate the median with MySQL? I've used AVG(x) for finding the mean, but I'm having a hard time finding a simple way of calculating the median. For now, I'm returning all the rows to PHP, doing a sort, and then picking the middle row, but surely there must be some simple way of doing it in a single MySQL query. Example data: id | val -----
How do I install an R package from source?
A friend sent me along this great tutorial on webscraping The New York Times with R. I would really love to try it. However, the first step is to install a package called [RJSONIO][2] from source. I know R reasonably well, but I have no idea how to install a package from source. I'm running macOS (OS X).
git svn dcommit fails because of assertion error "svn_fspath__is_canonical(child_fspath)" (cygwin)
I hope anybody can help me. When I try to push my local git branch to the svn server this will always result into this error: $ git svn dcommit Committing to http://.../Dev_Stream/01_workspace ... C path/to/file/AbstractSystemThread.java => other/path/to/file/Thread/AbstractThread.java assertion "svn_fspath__is_canonical(child_fspath)" failed: file "/usr/src/subversion/subversion-1.8.0-1/src/subve
Batch files - number of command line arguments
Just converting some shell scripts into batch files and there is one thing I can't seem to find...and that is a simple count of the number of command line arguments. eg. if you have: myapp foo bar In Shell: $# -> 2 $* -> foo bar $0 -> myapp $1 -> foo $2 -> bar In batch ?? -> 2 <---- what command?! %* -> foo bar %0 -> myapp %1 -> foo %2 -> bar So I've looked around, and either I'm looking in the wr
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Expect to receive with particular argument at least once
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