human
I wrote the below code

    def callbinrepr(op, left, right):
        'Call    the    pytest_assertrepr_compare    hook    and    prepare    the    result\n\n                                This    uses    the    first    result    from    the    hook    and    then    ensures    the\n                                following:\n                                *    Overly    verbose    explanations    are    dropped    unless    -vv    was    used    or\n                                        running    on    a    CI.\n                                *    Embedded    newlines    are    escaped    to    help    util.format_explanation()\n                                        later.\n                                *    If    the    rewrite    mode    is    used    embedded    %-characters    are    replaced\n                                        to    protect    later    %    formatting.\n\n                                The    result    can    be    formatted    by    util.format_explanation()    for\n                                pretty    printing.\n                                '
        hook_result = item.ihook.pytest_assertrepr_compare(config=item.config, op=op, left=left, right=right)
        for new_expl in hook_result:
            if new_expl:
                if ((sum((len(p) for p in new_expl[1:])) > (80 * 8)) and (item.config.option.verbose < 2) and (not _running_on_ci())):
                    show_max = 10
                    truncated_lines = (len(new_expl) - show_max)
                    new_expl[show_max:] = [py.builtin._totext(('Detailed    information    truncated    (%d    more    lines),    use    "-vv"    to    show' % truncated_lines))]
                new_expl = [line.replace('\n', '\\n') for line in new_expl]
                res = py.builtin._totext('\n~').join(new_expl)
                if (item.config.getvalue('assertmode') == 'rewrite'):
                    res = res.replace('%', '%%')
                return res
    util._reprcompare = callbinrepr

What's a good function header?
assistant
#Here is Python code to compare    hook    and    prepare    the    result\n\n                                This    uses    the    first    result    from    the    hook    and    then    ensures    the\n                                following:\n                                *    Overly    verbose    explanations    are    dropped    unless    -vv    was    used    or\n                                        running    on    a    CI.

def pytest_runtest_setup(item):