Method _repr_compare

src/_pytest/python_api.py:330–373

(self, other_side: Sequence[float])

        return f"approx({seq_type(self._approx_scalar(x) for x in self.expected)!r})"

    def _repr_compare(self, other_side: Sequence[float]) -> list[str]:
        import math

        if len(self.expected) != len(other_side):
            return [
                "Impossible to compare lists with different sizes.",
                f"Lengths: {len(self.expected)} and {len(other_side)}",
            ]

        approx_side_as_map = _recursive_sequence_map(self._approx_scalar, self.expected)

        number_of_elements = len(approx_side_as_map)
        max_abs_diff = -math.inf
        max_rel_diff = -math.inf
        different_ids = []
        for i, (approx_value, other_value) in enumerate(
            zip(approx_side_as_map, other_side, strict=True)
        ):
            if approx_value != other_value:
                try:
                    abs_diff = abs(approx_value.expected - other_value)
                    max_abs_diff = max(max_abs_diff, abs_diff)
                # Ignore non-numbers for the diff calculations (#13012).
                except TypeError:
                    pass
                else:
                    if other_value == 0.0:
                        max_rel_diff = math.inf
                    else:
                        max_rel_diff = max(max_rel_diff, abs_diff / abs(other_value))
                different_ids.append(i)
        message_data = [
            (str(i), str(other_side[i]), str(approx_side_as_map[i]))
            for i in different_ids
        ]

        return _compare_approx(
            self.expected,
            message_data,
            number_of_elements,
            different_ids,
            max_abs_diff,
            max_rel_diff,
        )

    def __eq__(self, actual) -> bool:
        try: