E-TE0615 — Iterables of different lengths passed to is_same

Error Type	Type Error
Phase	calling jm.is_same
Python exception	TypeError (builtin)

Message

The iterables passed to `is_same` have different lengths (the `{longer}` argument is longer).

Possible fix: pass iterables with the same number of elements.

({longer} is src when the first argument is the longer one and dst when the second one is)

Cause

Both arguments to jm.is_same were consumed as iterables and compared element by element; every paired element compared as the same, but then one iterable produced more elements than the other. The comparison stops at the first surplus element, so the error reports only which side is longer, not by how much. As with E-TE0614, the element-by-element comparison applies when the arguments cannot be read as single collection expressions, for example iterables of Problem or Constraint objects, or generators; two lists of plain expressions with different lengths are instead compared in one piece and return False.

Fix

Pass iterables with the same number of elements. If a length difference is expected and should simply mean “not the same”, compare the lengths yourself before calling is_same:

import jijmodeling as jm

p = jm.Problem("example")

# Raises E-TE0615: the second iterable has one more element
# jm.is_same([p], [p, p])

lhs, rhs = [p], [p, p]
same = len(lhs) == len(rhs) and jm.is_same(lhs, rhs)  # False, no error

Related

E-TE0612 — the whole arguments are of an unsupported type. E-TE0613 — the whole arguments cannot be compared as a pair. E-TE0614 — an incomparable pair of elements inside the iterables.