Pyglet provides some great ways to reduce function-call overhead for
sprites (groups and batches).  But I still find myself looping through
X sprites Y times a second, where X*Y can get quite large, doing
things like "x+=dx;y+=dy".  I know there are packages like SciPy that
can add an entire "dx" array to an "x" array at C-speed, but I'd
rather not add the dependency.

Is there a "best practice" for doing this sort of thing in pure Python?
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