Comment #6 on issue 1936 by smichr: Integral limits should be sanitized http://code.google.com/p/sympy/issues/detail?id=1936
An unevaluted integral is not evaluated at any limit (upper or lower) so it seems reasonable that (x, None, None) can mean "unevaluated integral", i.e. (x, None)
-- You received this message because you are subscribed to the Google Groups "sympy-issues" group. To post to this group, send email to sympy-iss...@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.