I need a way to accumulate the segment lengths of a polyline. Each individual segment contains its associated length and contains a unique id which is specific to each feature. I'm inexperienced with python but learning as I go. Can anyone provide some ideas or a reference to an existing script that may help to get me started ? This might help with any questions about what I'm trying to achieve. ID|LENGTH|CUM_LENGTH 1 |10|10 1 |14|24 1 | 9|33 2 | 6| 6 2 |13|19 2 | 8|27
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