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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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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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How to get min/max of two integers in Postgres/SQL?

...(or minimum) of two integers in Postgres/SQL? One of the integers is not a column value. 2 Answers ...
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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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Is SQL or even TSQL Turing Complete?

This came up at the office today. I have no plans of doing such a thing, but theoretically could you write a compiler in SQL? At first glance it appears to me to be turing complete, though extremely cumbersome for many classes of problems. ...
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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 ...
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MySql: Tinyint (2) vs tinyint(1) - what is the difference?

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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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dplyr: “Error in n(): function should not be called directly”

I am attempting to reproduce one of the examples in the dplyr package but am getting this error message. I am expecting to see a new column n produced with the frequency of each combination. What am I missing? I triple checked that the package is loaded. ...
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ruby convert array into function arguments

Say I have an array. I wish to pass the array to a function. The function, however, expects two arguments. Is there a way to on the fly convert the array into 2 arguments? For example: ...