E-TE0613 — Mismatched argument types for is_same

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

Message

`is_same` cannot compare a value of type `{src_type}` with a value of type `{dst_type}`.

Possible fix: pass two JijModeling objects of the same kind, or two iterables of them.

({src_type} and {dst_type} are the Python types of the first and second argument)

Cause

The two arguments to jm.is_same have different Python types, and they cannot be compared either as a pair of JijModeling objects of the same kind or as a pair of iterables. Typical triggers are comparing two JijModeling objects of different kinds, such as a placeholder against a Problem; comparing a JijModeling object against a value is_same does not support, such as a placeholder against None; or wrapping only one side in a list, as in jm.is_same(problem, [problem]).

Fix

Pass two JijModeling objects of the same kind, or two iterables of them:

import jijmodeling as jm

problem1 = jm.Problem("p")
problem2 = jm.Problem("p")
a = problem1.Placeholder("a", dtype=float)

# Raises E-TE0613: a placeholder cannot be compared with a problem
# jm.is_same(a, problem1)

b = problem2.Placeholder("a", dtype=float)
assert jm.is_same(a, b)

When comparing collections, wrap both sides — compare [p1] with [p2], not p1 with [p2]. If one of the values can be None, guard the call, for example x is not None and jm.is_same(x, y).

Related

E-TE0612 — the same situation with two arguments of the same Python type. E-TE0614 — an incomparable pair of elements inside two iterables. E-TE0615 — two iterables of different lengths.