Ouch, sorry I was wrong, I've mistakenly pasted an invalid snippet.
> This is how to do it:
>
> lines = QgsVectorLayer("LineString", "temporary_lines", "memory")
> pr = lines.dataProvider()
> ret = pr.addAttributes( [ QgsField("label", QVariant.String) ] )
> QgsMapLayerRegistry.instance().addMapLayer(lines)
>Thank you, this code works for me. Vaclav
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