<div dir="ltr"><div>Grazie Andrea</div><div><br></div><div>quindi tu mi consigli di aggiungere una classe prepareAlgorithm al mio script?</div><div><br></div><div>Giacomo<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Il giorno mer 13 gen 2021 alle ore 16:31 Andrea Giudiceandrea <<a href="mailto:andreaerdna@libero.it" target="_blank">andreaerdna@libero.it</a>> ha scritto:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Giacomo Fontanelli-2 wrote<br>
> TypeError: invalid result from ZonalStatisticsStack.prepareAlgorithm(), a<br>
> 'bool' is expected not 'NoneType'<br>
<br>
prepareAlgorithm() deve sempre restituire un valore booleano, che sarà True<br>
se la "preparazione" è andata bene, o False se non è possibile proseguire<br>
con l'esecuzione dell'algorithmo.<br>
<br>
<a href="https://qgis.org/pyqgis/3.10/core/QgsProcessingAlgorithm.html#qgis.core.QgsProcessingAlgorithm.prepareAlgorithm" rel="noreferrer" target="_blank">https://qgis.org/pyqgis/3.10/core/QgsProcessingAlgorithm.html#qgis.core.QgsProcessingAlgorithm.prepareAlgorithm</a><br>
<br>
<a href="https://github.com/qgis/QGIS/blob/release-3_10/python/plugins/processing/algs/qgis/ZonalStatistics.py#L116-L132" rel="noreferrer" target="_blank">https://github.com/qgis/QGIS/blob/release-3_10/python/plugins/processing/algs/qgis/ZonalStatistics.py#L116-L132</a><br>
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</blockquote></div>