QtWidgets.QFileDialog.getOpenFileName returns a Tuple

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After looking through a repository that was being updated to Qt5 as well; I found they used a line like this.

filename, _filter = QtWidgets.QFileDialog.getOpenFileName(None, "Open " + key + " Data File", '.', "(*.csv)")

filename is a string and the (*.csv) gets discarded in the _filter variable

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