giannis.dafnomi...@gmail.com wrote: > Hey Peter. > > This worked like a charm! I can't believe I did not think of that, after > wasting so many hours on it. > > Thank you so much for the help!
You can make these things easier to debug by breaking your code into small functions. If there were separate functions def make_finalcosts(...): ... # i is a local variable here def make_probvars(...): ... # i is not defined here and there's no global i you'd have seen a NameError exception similar to the one below: >>> def example(m, n): ... return [i + k for j in range(m) for k in range(n)] ... >>> example(1, 2) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "<stdin>", line 2, in example File "<stdin>", line 2, in <listcomp> NameError: name 'i' is not defined Writing a function in such a way that the result only depends on the function's arguments allows for easy testing. -- https://mail.python.org/mailman/listinfo/python-list
