Comment #2 on issue 3347 by krastano...@gmail.com: plotting error in master http://code.google.com/p/sympy/issues/detail?id=3347
The error was raised because the test_matplotlib.py was run for some reason without matplotlib installed, hence it tried to call unexisting methods on the ASCII-art backend (the fall-back backend).
Whatever is used to detect whether matplotlib is installed or not is not present in this file (or works in a different way from the detection mechanism used for choosing a backend).
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