Pyglet 1.2

[Aaron Meurer]

Pyglet 1.2 has been released http://www.pyglet.org/index.html. Among
other things, it supports Python 3. I just tried to use it with SymPy,
but it looks like our pygletplot module does not support Python 3 (it
uses implicit relative imports). And it doesn't work in Python 2
either (name 'c_float' is not defined). So let's fix these, so we can
test it out.

Aaron Meurer

[Aaditya Nair]

I worked on this one. `name 'c_float' not defined` is actually fixed in the master branch.

[Aaron Meurer]

Ah, I forgot to pull first. Now I get

>>> PygletPlot(x**2)
Traceback (most recent call last):
File "<ipython-input-6-ce172b927272>", line 1, in <module>
PygletPlot(x**2)
File "/Users/aaronmeurer/Documents/python/sympy/sympy/sympy/plotting/pygletplot/__init__.py",
line 140, in PygletPlot
return plot.PygletPlot(*args, **kwargs)
File "/Users/aaronmeurer/Documents/python/sympy/sympy/sympy/plotting/pygletplot/plot.py",
line 242, in __init__
self[0] = fargs
File "/Users/aaronmeurer/Documents/python/sympy/sympy/sympy/plotting/pygletplot/plot.py",
line 319, in __setitem__
f = PlotMode(*args, **kwargs)
File "/Users/aaronmeurer/Documents/python/sympy/sympy/sympy/plotting/pygletplot/plot_mode.py",
line 78, in __new__
subcls = PlotMode._get_mode(mode_arg, i, d)
File "/Users/aaronmeurer/Documents/python/sympy/sympy/sympy/plotting/pygletplot/plot_mode.py",
line 156, in _get_mode
return PlotMode._get_default_mode(i, d)
File "/Users/aaronmeurer/Documents/python/sympy/sympy/sympy/plotting/pygletplot/plot_mode.py",
line 170, in _get_default_mode
return PlotMode._mode_default_map[d][i]
KeyError: 1

Aaron Meurer

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[Aaditya Nair]

This is similar to #8915 where the user tried for an Ellipse. I think we need to reopen it.