human
Can you provide a the Python program you requested given the following:
Complete the below
def get_dummy_course(start, announcement=None, is_new=None, advertised_start=None, end=None, certs='end'):

    ''''Get a dummy course'
    '''
assistant
#Here is the Python program you requested.
    system = DummySystem(load_error_modules=True)
    def to_attrb(n, v):
        return ('' if (v is None) else '{0}="{1}"'.format(n, v).lower())
    is_new = to_attrb('is_new', is_new)
    announcement = to_attrb('announcement', announcement)
    advertised_start = to_attrb('advertised_start', advertised_start)
    end = to_attrb('end', end)
    start_xml = '\n                                    <course    org="{org}"    course="{course}"    display_organization="{org}_display"    display_coursenumber="{course}_display"\n                                                                graceperiod="1    day"    url_name="test"\n                                                                start="{start}"\n                                                                {announcement}\n                                                                {is_new}\n                                                                {advertised_start}\n                                                                {end}\n                                                                certificates_display_behavior="{certs}">\n                                                <chapter    url="hi"    url_name="ch"    display_name="CH">\n                                                                <html    url_name="h"    display_name="H">Two    houses,    ...</html>\n                                                </chapter>\n                                    </course>\n                    '.format(org=ORG, course=COURSE, start=start, is_new=is_new, announcement=announcement, advertised_start=advertised_start, end=end, certs=certs)
    return system.process_xml(start_xml)