human
Complete the below
def _print_report(stats, now=None):

    ''''Print final report.
    :param stats: a dictionary returned by :py:func:`_clusters_to_stats`
    :param now: the current UTC time, as a :py:class:`datetime.datetime`.
    Defaults to the current time.'
    '''
assistant
#Here is Python code to print final report.
    if (now is None):
        now = _boto3_now()
    s = stats
    if (not s['clusters']):
        print('No    clusters    created    in    the    past    two    months!')
        return
    print(('Total        #    of    Clusters:    %d' % len(s['clusters'])))
    print()
    print('*    All    times    are    in    UTC.')
    print()
    print(('Min    create    time:    %s' % min((cs['created'] for cs in s['clusters']))))
    print(('Max    create    time:    %s' % max((cs['created'] for cs in s['clusters']))))
    print(('            Current    time:    %s' % now.replace(microsecond=0)))
    print()
    print('*    All    usage    is    measured    in    Normalized    Instance    Hours,    which    are')
    print('        roughly    equivalent    to    running    an    m1.medium    instance    for    an    hour.')
    print("        Billing    is    estimated,    and    may    not    match    Amazon's    system    exactly.")
    print()
    def with_pct(usage):
        return (usage, _percent(usage, s['nih_billed']))
    print(('Total    billed:        %9.2f        %5.1f%%' % with_pct(s['nih_billed'])))
    print(('        Total    used:        %9.2f        %5.1f%%' % with_pct(s['nih_used'])))
    print(('                bootstrap:    %9.2f        %5.1f%%' % with_pct(s['bootstrap_nih_used'])))
    print(('                jobs:                        %9.2f        %5.1f%%' % with_pct(s['job_nih_used'])))
    print(('        Total    waste:    %9.2f        %5.1f%%' % with_pct(s['nih_bbnu'])))
    print(('                at    end:                %9.2f        %5.1f%%' % with_pct(s['end_nih_bbnu'])))
    print(('                other:                    %9.2f        %5.1f%%' % with_pct(s['other_nih_bbnu'])))
    print()
    if s['date_to_nih_billed']:
        print('Daily    statistics:')
        print()
        print('    date                                        billed                        used                    waste            %    waste')
        d = max(s['date_to_nih_billed'])
        while (d...