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The Path message is not an array. You should use rosmsg to see the format of the message:

rosmsg info nav_msgs/Path

If your message variable is named Path, you need use code like this:

n = len(Path.poses)
x = Path.poses[i].pose.position.x

Another problem this code has is that it makes no sense to read only 1 field of the orientation. w is meaningless on its own.

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