pyqt5 - how to use QSignalBlocker class?

I had the assumption that:

Code:

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QtCore.QSignalBlocker(mywidget.setValue(somevalue))

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Would be somewhat equivalent to:

Code:

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mywidget.blockSignals(True)
mywidget.setValue(somevalue)
mywidget.blockSignals(False)

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But, I've found that the latter actually does block the signals while the former appears to do "nothing".

I must be missing something. Anyone have some insight?