Hello,
I have a list called ''list'' of variable length depending on features.
I wanna assign as an attribute to each feature ''list(0) ; list(1) .... list(lenght(list))''
I tried writing a loop on the attribute manager but I didn't know how to use it well
Thanks for any possible help :)
Best answer by david_r
Try something like this:
import fmeobjects
VALUE_DELIMITER = ','
ITEM_DELIMITER = ';'
def concat_list(feature):
distances = feature.getAttribute('_list{}._distance')
orders = feature.getAttribute('_list{}._order')
types = feature.getAttribute('_list{}._DZ_Type')
items = []
for values in zip(distances, orders, types):
items.append(VALUE_DELIMITER.join(values))
feature.setAttribute('result', ITEM_DELIMITER.join(items))
Play around with VALUE_DELIMITER and ITEM_DELIMITER until you get what you need.
Given the input lists:
The result will be:
Do you want to concatenate all element values in a list?
For example, if the list stores these values,
List ElementValue_list{0}._distance10_list{1}._distance20_list{2}._distance30 do you need to create this attribute? Attribute NameValue_distances10;20;30
I'm not quite sure I understand what you want to do with the list, but have you looked at the ListExploder? It will create one feature for each list item, depending on the list length.
If you simply need a string with all the concatenated list values, have a look at the ListConcatenator.
Do you want to concatenate all element values in a list?
For example, if the list stores these values,
List ElementValue_list{0}._distance10_list{1}._distance20_list{2}._distance30 do you need to create this attribute? Attribute NameValue_distances10;20;30What I wanna do is : ''_list(0)._distance" + ''_list(0)._order" + ''_list(0)._DZ_Type" + ''_list(1)._distance" + ''_list(1)._order" + ''_list(1)._DZ_Type"
and so on until the end of the list.
The list have a different length depending on each feature
I'm not quite sure I understand what you want to do with the list, but have you looked at the ListExploder? It will create one feature for each list item, depending on the list length.
If you simply need a string with all the concatenated list values, have a look at the ListConcatenator.
I have read its documentation but I think it's not the appropriate one what I wanna do is :
''_list(0)._distance" + ''_list(0)._order" + ''_list(0)._DZ_Type" + ''_list(1)._distance" + ''_list(1)._order" + ''_list(1)._DZ_Type"
and so on until the end of the list.
The list have a different length depending on each feature
Do you want to concatenate all element values in a list?
For example, if the list stores these values,
List ElementValue_list{0}._distance10_list{1}._distance20_list{2}._distance30 do you need to create this attribute? Attribute NameValue_distances10;20;30
Try something like this:
import fmeobjects
VALUE_DELIMITER = ','
ITEM_DELIMITER = ';'
def concat_list(feature):
distances = feature.getAttribute('_list{}._distance')
orders = feature.getAttribute('_list{}._order')
types = feature.getAttribute('_list{}._DZ_Type')
items = []
for values in zip(distances, orders, types):
items.append(VALUE_DELIMITER.join(values))
feature.setAttribute('result', ITEM_DELIMITER.join(items))
Play around with VALUE_DELIMITER and ITEM_DELIMITER until you get what you need.
Given the input lists:
The result will be:
Try something like this:
import fmeobjects
VALUE_DELIMITER = ','
ITEM_DELIMITER = ';'
def concat_list(feature):
distances = feature.getAttribute('_list{}._distance')
orders = feature.getAttribute('_list{}._order')
types = feature.getAttribute('_list{}._DZ_Type')
items = []
for values in zip(distances, orders, types):
items.append(VALUE_DELIMITER.join(values))
feature.setAttribute('result', ITEM_DELIMITER.join(items))
Play around with VALUE_DELIMITER and ITEM_DELIMITER until you get what you need.
Given the input lists:
The result will be:
It worked
I tried the python script above and it worked
I managed also meanwhile to complete the task using a combination of transformers
thank you very much
By the way, how the list attribute was created in your workflow? Depending on the condition, there could be a more simple solution without scripting.
For example, the list has been created with the Generate List option in a transformer, you can create a new attribute concatenating the three attribute values (_distance, _order, and _DZ_Zone) before creating the list, then just concatenate elements in the resulting list, with the ListConcatenator following to the transformer.
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