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a� A collection of modules for iterating through different kinds of
tree, generating tokens identical to those produced by the tokenizer
module.
To create a tree walker for a new type of tree, you need to
implement a tree walker object (called TreeWalker by convention) that
implements a 'serialize' method which takes a tree as sole argument and
returns an iterator which generates tokens.
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a; Get a TreeWalker class for various types of tree with built-in support
:arg str treeType: the name of the tree type required (case-insensitive).
Supported values are:
* "dom": The xml.dom.minidom DOM implementation
* "etree": A generic walker for tree implementations exposing an
elementtree-like interface (known to work with ElementTree,
cElementTree and lxml.etree).
* "lxml": Optimized walker for lxml.etree
* "genshi": a Genshi stream
:arg implementation: A module implementing the tree type e.g.
xml.etree.ElementTree or cElementTree (Currently applies to the "etree"
tree type only).
:arg kwargs: keyword arguments passed to the etree walker--for other
walkers, this has no effect
:returns: a TreeWalker class
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