Function _format_message

xarray/testing/assertions.py:273–297

(x, y, err_msg, verbose)

def _format_message(x, y, err_msg, verbose):
    diff = x - y
    abs_diff = max(abs(diff))
    rel_diff = "not implemented"

    n_diff = np.count_nonzero(diff)
    n_total = diff.size

    fraction = f"{n_diff} / {n_total}"
    percentage = float(n_diff / n_total * 100)

    parts = [
        "Arrays are not equal",
        err_msg,
        f"Mismatched elements: {fraction} ({percentage:.0f}%)",
        f"Max absolute difference: {abs_diff}",
        f"Max relative difference: {rel_diff}",
    ]
    if verbose:
        parts += [
            f" x: {x!r}",
            f" y: {y!r}",
        ]

    return "\n".join(parts)


@ensure_warnings