Develop class ListCollector as a subclass of HTMLParser that, when fed an HTML file, creates a Python list for every ordered or unordered list in the HTML document. Each item of a Python list should be the text data that appears in one item of the corresponding HTML list. You may assume that every item of every list in the HTML document contains only text data (i.e. no other HTML element). The class ListCollector should support method getLists() that takes no input arguments but returns a list containing all the cre- ated Python lists.

>>> infile = open('lists.html')

>>> content = infile.read()

>>> infile.close()

>>> myparser = ListCollector()

>>> myparser.feed(content)

>>> myparser.getLists() [['An item', 'Another', 'And another one'], ['Item one', 'Item two', 'Item three', 'Item four']]