Typeerror: '<' Not Supported Between Instances Python
Solution 1:
Given that pre_sorted
is a list of lists with items [fitness, part]
, this croaks whenever comparing two sublists with the same fitness
.
Python lists sort lexicographically and are compared element-wise left to right until a mismatching element is found. In your case, the second element (part
) is only accessed if the fitness of two parts is the same.
[0, part0] < [1, part1]
=> does not comparepart0
andpart1
since the fitness is already different.[0, part0] < [0, part1]
=> does comparepart0
andpart1
since the fitness is the same.
Suggestion 1
Sort only by fitness: sorted(pre_sorted, key=operator.itemgetter(0))
Suggestion 2
Read the documentation for functools.total_ordering
give part
a total order:
@total_orderingclasspart():
[...]
def__lt__(self, other):
returnself.number < other.number
And yeah, sorting lists of lists seems wrong. The inner elements might better be tuples, so you cannot accidentally modify the contents.
Solution 2:
So pre_sorted
is a list with elements of [int, part]
. When you sort this list and have two elements with the same integer value, it then compares the part
values to try to determine which goes first. However, since you have no function for determining if a part is less than a part, it throws that error.
Try adding a function __lt__(self, other)
to be able to order parts.
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