`exec`-based routine crashes app upon migration from 3.4.3 to python 3.5.2.

[Lawrence D’Oliveiro]

On Friday, July 29, 2016 at 6:25:51 AM UTC+12, Enjoys Math wrote:

>                 exec('obj = ' + objType + '(self)', None, _locals)
>                 obj = _locals['obj']

Why? Why not just

    obj = objType(self)

?