def __init__(self, groups=None):
        super(GroupedRequirements, self).__init__(NamedRequirements)
        self.groups = groups or self.default_groups
        self.filename = None
        self.create_default_groups()
def main(args):
    '''Populates an html template using JSON-formatted output from the
    Linux 'du' utility and prints the result'''
    html = '''