sympy/sympy — pull request #693 by hazelnusse (2011-11-01 18:20:27+00:00)
Title: Changed .unit to .normalize(), .mag to .magnitude()

As per the discussion in Issue 2807 [0], this branch changes the .unit and .mag properties of the sympy.physics.mechanics Vector class to instance methods .normalize(self) and .magnitude(self), respectively.

[0] -- http://code.google.com/p/sympy/issues/detail?id=2807