I sent a PR https://github.com/sympy/sympy/pull/7290 but its travis build failed. I have not used github for too long so I am unable to figure out the problem.
Any suggestion knows why it is failing? -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/52030bd9-0f1e-4c94-bd0e-c8accd746b30%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
