Index of list Cant find the index in the List

[Mate_Magyar]

If all the parameters of the line is matching, it will be equal.
If it’s not that easy job and the lines just nearly the same, you could Round the parameters value, by getting the start,end points or X,Y,Z coordinates out of the line and match/sort by those values.
Or you could use the new Equals Node with Tolerance Input node

New Equals Node with Tolerance Input

Hello Dynamo fans! We, the Dynamo team, have launched a new Equals node in the latest daily build for Dynamo 2.5, which can take in a custom tolerance from the user. This enables you to do equality checks easily for numbers within a user defined tolerance thus giving you the flexibility to work outside the constraints of the built-in tolerance of 1e-5 used internally in DesignScript. We have tried to do a better job of explaining the concept of equality in DesignScript and what the internal con…

(I haven’t tried it yet)