Comment #4 on issue 2057 by smi...@gmail.com: Units do not work together with evalf?
http://code.google.com/p/sympy/issues/detail?id=2057
The other option is to do the subs before evalf is requested: >>> g.subs(v, 1).evalf() 3.33564095198152e-9*s/m -- You received this message because you are subscribed to the Google Groups "sympy-issues" group. To post to this group, send email to sympy-issues@googlegroups.com. To unsubscribe from this group, send email to sympy-issues+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sympy-issues?hl=en.