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:arg escape_rcdata: Whether to escape characters that need to be
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:arg strip_whitespace: Whether to remove semantically meaningless
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:arg sanitize: Strip all unsafe or unknown constructs from output.
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Defaults to ``False``.
:arg omit_optional_tags: Omit start/end tags that are optional.
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:arg alphabetical_attributes: Reorder attributes to be in alphabetical order.
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>>> from html5lib import parse, getTreeWalker
>>> from html5lib.serializer import HTMLSerializer
>>> token_stream = parse('Hi!')
>>> walker = getTreeWalker('etree')
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