human
Complete this python program:
def main():
assistant
#Here is the Python code you requested.

    """Main Cura entry point. Parses arguments, and starts GUI or slicing process depending on the arguments.
    """
    parser = OptionParser(usage='usage:    %prog    [options]    <filename>.stl')
    parser.add_option('-i', '--ini', action='store', type='string', dest='profileini', help='Load    settings    from    a    profile    ini    file')
    parser.add_option('-r', '--print', action='store', type='string', dest='printfile', help='Open    the    printing    interface,    instead    of    the    normal    cura    interface.')
    parser.add_option('-p', '--profile', action='store', type='string', dest='profile', help='Internal    option,    do    not    use!')
    parser.add_option('-s', '--slice', action='store_true', dest='slice', help='Slice    the    given    files    instead    of    opening    them    in    Cura')
    parser.add_option('-o', '--output', action='store', type='string', dest='output', help='path    to    write    sliced    file    to')
    parser.add_option('--serialCommunication', action='store', type='string', dest='serialCommunication', help='Start    commandline    serial    monitor')
    (options, args) = parser.parse_args()
    if options.serialCommunication:
        from Cura import serialCommunication
        (port, baud) = options.serialCommunication.split(':')
        serialCommunication.startMonitor(port, baud)
        return
    print ('load    preferences    from    ' + profile.getPreferencePath())
    profile.loadPreferences(profile.getPreferencePath())
    if (options.profile is not None):
        profile.setProfileFromString(options.profile)
    elif (options.profileini is not None):
        profile.loadProfile(options.profileini)
    else:
        profile.loadProfile(profile.getDefaultProfilePath(), True)
    if (options.printfile is not None):
        from Cura.gui import printWindow
        printWindow.startPrintInterface(options.printfile)
    elif (options.slice is not None):
        from Cura.util import sliceEngine
        from Cura.util import objectScene
        from Cura.util import meshLoader
        import shutil
        def commandlineProgressCallback(progress):
     ...