Relational operators always evaluate to True when cast to bool

[mlangiu]

With the current version of symengine (symengine-0.6.0) the following returns True

import symengine as se

x = se.S('x')
expr = se.Eq(x, 0)
print(bool(expr))

The outcome I expected was a TypeError as in sympy

[qthequartermasterman]

This is not a resolution to this issue, but is a useful workaround for some cases. If both sides of the expression can be evaluated (i.e. checking if 0==sqrt(2)), then running bool(expr.simplify()) will return False if the equality is indeed false.
This is not ideal for speed purposes, because as far as I can tell, it uses sympy's simplify features to do the simplification.

This does not help in the case that either side does not simplify, like in the original post.

[qthequartermasterman]

This is fixed in PR #354. That Pull Request raises a TypeError if there are free variables, and will return True or False depending on the simplification of the relational if there are no free variables.