[PyQt] Disconnects slot from signal

[Florian Bruhin]

* iMath <2281570025 at qq.com> [2014-12-04 11:09:32 +0800]:
> I made a mistake before  ,the three‍ lines code all worked ,just consider my suggestion for letting disconnect([slot]) in the New-style Signal and Slot returns a bool value to hint if the connection is broken or not .‍

It raises an exception if not, e.g. "TypeError: 'function' object is
not connected".

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