Hello,
I have objects, that have a list with a number of different attributes. One of the attributes on that list is another list with a few attributes. Both lists contain 1 - n elements (if either one of the lists is empty, the object is not valid). So, a bit more visual:
Object1.list1[0].attrib1
Object1.list1[0].list2[0].Attr1
Object1.list1[0].list2[0].Attr2
Object1.list1[0].list2[1].Attr1
Object1.list1[0].list2[1].Attr2
Object1.list1[1].attrib1
Object1.list1[1].list2[0].Attr1
Object1.list1[1].list2[0].Attr2
Object1.list1[1].list2[1].Attr1
Object1.list1[1].list2[1].Attr2
And so on. What I want to do is check all list2.Attr1 for a certain value, then add list2.Attr2 as an attribute on Object1 (for easier processing and reporting). Due to a large volume of data it isn’t really feasible to use ListExploders (I’m already running into memory issues as it is), so I thought I’d try the Pythoncaller. So far this is what I’ve tried:
def input(self, feature):
first_list = feature.getAttribute('list1{}')
for fl in first_list:
second_list = fl.list2{}
for sl in second_list:
if sl.Attr1== "Yes":
feature.setAttribute('Attr2', sl.Attr2)
self.pyoutput(feature)But it doesn’t seem to be the right way: I keep getting an error:
Python Exception <SyntaxError>: invalid syntax (<string>, line 19)
Line 19 is:
for sl in second_list:
So it seems that second_list = fl.list2{} isn’t doing what I thought it would be doing. I’ve tried with and without {}, which does not seem to make a difference.
How can I get this working? I’ve tried searching here, and wider, but can’t find anything that deals with this kind of nested lists. It is the best way of dealing with the type of data that I’m handling though, otherwise the number of features will explode (list1 can contain 20 items, and list2 can contain upwards of 400 items in some rare occasions).
TIA,
Stefan
