Hi!
How to attach the leads manually, if I have the coordinates.
I use class kwant.builder.Lead and I have an error: "TypeError: Can't instantiate abstract class Lead with abstract methods finalized".
What does it mean?

For example, for two atoms:

left_lead = kwant.builder.Lead()

#add site
left_lead[lat(-90.26501, 13.2107)] = 4
left_lead[lat(-91.60269, 12.67463)] = 4

#add hopping
left_lead[lat(-90.26501, 13.2107), lat(-91.60269, 12.67463)] = 1

sys.attach_lead(left_lead)

С уважением, Татьяна Григоренко

grigorenochka@mail.ru