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How to do a scatter plot with empty circles in Python?

In Python, with Matplotlib, how can a scatter plot with empty circles be plotted? The goal is to draw empty circles around some of the colored disks already plotted by scatter() , so as to highlight them, ideally without having to redraw the colored circles. ...
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What is the difference between Ruby 1.8 and Ruby 1.9

I'm not clear on the differences between the "current" version of Ruby (1.8) and the "new" version (1.9). Is there an "easy" or a "simple" explanation of the differences and why it is so different? ...
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How to use the “number_to_currency” helper method in the model rather than view?

I would like to use to_dollar method in my model like this: 11 Answers 11 ...
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Is it pythonic to import inside functions?

... In the long run I think you'll appreciate having most of your imports at the top of the file, that way you can tell at a glance how complicated your module is by what it needs to import. If I'm adding new code to an existing file I'll usually do the import where it's neede...
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Converting timestamp to time ago in PHP e.g 1 day ago, 2 days ago…

I am trying to convert a timestamp of the format 2009-09-12 20:57:19 and turn it into something like 3 minutes ago with PHP. ...
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Flask vs webapp2 for Google App Engine

I'm starting new Google App Engine application and currently considering two frameworks: Flask and webapp2 . I'm rather satisfied with built-in webapp framework that I've used for my previous App Engine application, so I think webapp2 will be even better and I won't have any problems with it. ...
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Reading output of a command into an array in Bash

I need to read the output of a command in my script into an array. The command is, for example: 3 Answers ...
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User Authentication in ASP.NET Web API

This topic has been incredibly confusing for me. I am a rookie in HTTP apps but need to develop an iPhone client that consumes JSON data from somewhere. I chose Web API from MS because it seemed easy enough but when it comes to authenticating users, things get quite frustrating. ...
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What's the difference between __PRETTY_FUNCTION__, __FUNCTION__, __func__?

... __PRETTY_FUNCTION__ , __FUNCTION__ , __func__ , and where are they documented? How do I decide which one to use? 5 Answ...
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What is data oriented design?

...e , and this guy goes on talking about how everyone can greatly benefit from mixing in data oriented design with OOP. He doesn't show any code samples, however. ...