[PyQt] QMetaObject::Connection equivalent

[Florian Bruhin]

Hi,

I just noticed Qt5 returns a QMetaObject::Connection object when using
QObject::connect:

http://doc.qt.io/qt-5/qobject.html#connect-2
http://doc.qt.io/qt-5/qmetaobject-connection.html

You can then use that with the appropriate QObject::disconnect method
to disconnect e.g. lambdas easily again:

http://doc.qt.io/qt-5/qobject.html#disconnect-4

I'm missing something like that in Python - it'd be nice to be able to
do something like this:

    w = QTextEdit()
    connection = w.textChanged.connect(lambda text: None)
    # [...]
    w.textChanged.disconnect(connection)

'connection' then would be some pyqtSignalConnection object which
pyqtSignal.disconnect understands.

Alternatively (or in addition to the above), disconnect could be a
method of pyqtSignalConnection:

    w = QTextEdit()
    connection = w.textChanged.connect(lambda text: None)
    # [...]
    connection.disconnect()

This would make it easier to work with Python lambda's and
pyqtSignals.

What do you think?

Florian

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