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Matplotlib: “Unknown projection '3d'” error

I just installed matplotlib and am trying to run one of there example scripts. However I run into the error detailed below. What am I doing wrong? ...
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How to do a less than or equal to filter in Django queryset?

I am attempting to filter users by a custom field in each users profile called profile. This field is called level and is an integer between 0-3. ...
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How do I find if a string starts with another string in Ruby?

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MySql: Tinyint (2) vs tinyint(1) - what is the difference?

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How do I change the formatting of numbers on an axis with ggplot?

I'm using R and ggplot to draw a scatterplot of some data, all is fine except that the numbers on the y-axis are coming out with computer style exponent formatting, i.e. 4e+05, 5e+05, etc. This is obviously unacceptable, so I want to get it to display them as 500,000, 400,000, and so on. Getting a p...
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Subscripts in plots in R

I can't find a way how to write subscripts in the title or the subtitle in R. How can I write v 1,2 with 1,2 as subscripts? ...
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How do I parse JSON with Objective-C?

I am new to iPhone. Can anyone tell me the steps to follow to parse this data and get the activity details, first name, and last name? ...
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Unittest setUp/tearDown for several tests

Is there a function that is fired at the beginning/end of a scenario of tests? The functions setUp and tearDown are fired before/after every single test. ...
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What's a redirect URI? how does it apply to iOS app for OAuth2.0?

Beginner programmer here, please pardon ignorance & explanations will be really nice :) 4 Answers ...
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Get all git commits since last tag

When I'm going to tag a commit, I need to know what changed since the last tagged commit. Eg: 2 Answers ...