'Execute the command'

def handle(self, *args, **options):

    if (len(args) == 0):
        raise CommandError('import    requires    at    least    one    argument:    <data    directory>    [<course    dir>...]')
    data_dir = args[0]
    if (len(args) > 1):
        source_dirs = args[1:]
    else:
        source_dirs = None
    print 'Importing.        Data_dir={data},    source_dirs={courses}'.format(data=data_dir, courses=source_dirs)
    perform_xlint(data_dir, source_dirs, load_error_modules=False)
