[PyQt] How to have QML interpret a property as null (instead of undefined)?

oliver oliver.schoenborn at gmail.com
Thu Oct 12 17:27:49 BST 2017

Is this a documented technique? If not, I would avoid it. Use only the
documented way of doing this, and if none is documented, there is likely a
reason that the feature is not available. In that case, find and understand
the reason, and fix your design accordingly.

On Thu, 12 Oct 2017 at 11:25 Russell Warren <russ at perspexis.com> wrote:

> Solution found: Returning a freshly instantiated QObject() does the
> trick.  QML interprets this as a null.  ie:
> @pyqtProperty(QVariant, notify = publicPropertyChanged)#'QDateTime')
> def my_date(self):
>     if self._my_date is None:
>         return QObject()  # QML interprets this as null
>     return QDateTime(self._my_date) # no PyQt autoconvert for
> datetime->QVariant
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