This brings a few improvements to Piecewise:
Implement methods such as _eval_conjugate, _eval_power, etc. to allow for
simplifications. Implement the is_real, etc. assumption methods. Fix the
canonalization of Piecewise with multiple otherwise conditions. Don't allow a
Set() inside a condition,
> -def is_commutative(self):
> -return all(expr.is_commutative for expr, _ in self.args)
> +def _eval_as_leading_term(self, x):
> +for e, c in self.args:
> +if c is True or c.subs(x, 0) is True:
> +return e.as_leading_term(x)
> +
> +def _eval_
This pull request [passes](http://travis-ci.org/sympy/sympy/builds/2064894)
(merged 4a65f8d3 into 0d88b25d).
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**SymPy Bot Summary:** :eight_spoked_asterisk: All tests have passed.
*Test command:* setup.py test
*master hash*: 0d88b25d001e4bf91d5ec36fddd06eb6cba77348
*branch hash*: 4a65f8d3bad78487ffc673866a7ed00d075fdbc6
**Interpreter 1:** :eight_spoked_asterisk: All tests have passed.
*Interpreter:* /u
