Hi Steffen.
Your code fails in the following lines: > LongBond = (((1, 0), a, b)) > SSH_lead[[kwant.builder.HoppingKind(*hopping) for hopping in > LongBond]] = 2 > because the 'LongBond' variable is not instantiated correctly. In Python you have to leave a trailing comma when creating a single-element tuple: > LongBond = (((1, 0), a, b),) to make things easier to read you can also just create a list: > LongBond = [((1, 0), a, b)] In the future you can try inserting calls to 'print' into your code to check certain conditions and inspect what is going on. Happy Kwanting, Joe
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