allAttrs = provider.attributeIndexes()
# start data retreival: fetch geometry and all attributes for each feature
#provider.select([fieldIndex])
provider.select(allAttrs)
caps = provider.capabilities()
# retreive every feature with its geometry and attributes
while provider.nextFeature(feat):
# fetch map of attributes
attrs = feat.attributeMap()
# attrs is a dictionary: key = field index, value = QgsFeatureAttribute
# show all attributes and their values
for (k, attr) in attrs.iteritems():
if k == fieldIndex:
#if attr.toString() == "":
if caps & QgsVectorDataProvider.ChangeAttributeValues:
identifier = QUuid().createUuid().toString()
# Remove the unwanted brackets
identifier.remove(QChar('{'), Qt.CaseInsensitive)
identifier.remove(QChar('}'), Qt.CaseInsensitive)
print "Newly create UUID: %s" % identifier
attrs = { fieldIndex : QVariant(identifier)}
success = provider.changeAttributeValues({ feat.id() : attrs })
#print success
QgsApplication.exitQgis()
