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Apologies for the delay; I assumed the answers from schilly and jason-grout would work (sorry!) but I got around to testing it today and it doesn't work for implicit_plot3d (works fine for plot3d). And now I am remembering why I wanted to see where implicit_plot3d sends its arguments: it seems to be handling color in a different way than plot3d.

so the following is fine:

sage: var('x,y,z')
sage: implicit_plot3d(x^2+y^2+z^2==4, (x, -3, 3), (y, -3,3), (z, -3,3), color='red')

but this is not:

sage: cmsel = [colormaps['autumn'](i) for i in sxrange(0,1,0.05)]
sage: var('x,y,z')
sage: implicit_plot3d(x^2+y^2+z^2==4, (x, -3, 3), (y, -3,3), (z, -3,3), color=cmsel)
ERROR: An unexpected error occurred while tokenizing input
The following traceback may be corrupted or invalid
The error message is: ('EOF in multi-line statement', (49, 0))
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
...
TypeError: 'NoneType' object is not iterable