min() arg is an empty sequence

Question

I\'m trying to find minimum element in matrix row, but there are two conditions: 1) it must be > 0 2) and this point must be not visited(is_visited[k] is False) I\'

Answer 1

If you want to avoid this ValueError in general, you can set a default argument to min(), that will be returned in case of an empty list. See described here.

min([], default="EMPTY")
# returns EMPTY

Note that this only works in Python 3.4+