The ElementTree API (Work In Progress)

Fredrik Lundh | December 2007

This document describes the ElementTree interface.

Also see The elementtree.ElementTree Module.

The ElementTree Class #

ElementTree(element) ⇒ tree

Wraps an element in a tree object. The given element becomes the root element for this tree.

ElementTree() ⇒ tree

Same, but creates an empty tree. The root element is set to None. Use parse or _setroot to set the root.

ElementTree(file=source) ⇒ tree

Same, but loads an XML document into the tree. This is the same thing as creating an empty tree and calling the parse method on it:

tree = ET.ElementTree()
tree.parse(source)

Alternatively, you can use the parse function to create a tree and load it in one step.

tree = ET.parse(source)

Methods #

parse #

tree.parse(source) ⇒ element

Loads an external XML document into this tree. The original contents are discarded. The source can be either a file name or a file object, or any other object that implements a file-like read method.

This method returns the root element.

tree.parse(source, parser) ⇒ element

Same, but uses the given parser object.

iter #

getiterator #

find #

findall #

findtext #

write #

tree.write(file)

tree.write(file, options)

Writes the tree to an XML file. The file can be either a name, or a file object, or any other object that has a file-like write method.

tree.write(file, encoding)

(Deprecated) Same, with the encoding given as a positional argument instead of a keyword option. This syntax is not portable, and should be avoided in new code.

Options

Use keyword arguments to provide options to the method:

encoding= Output encoding. If omitted or set to None, defaults to US-ASCII. The current ElementTree implementation only supports ASCII-compatible encodings (e.g. ISO-8859-1, UTF-8, and other encodings where the first 128 characters are identical to US-ASCII).

method= (New in 1.3) Output format. One of “xml”, “html” for HTML serialization (special treatment of empty elements and script/style elements), “text” (text and tail content only), and “c14n” (canonicalized output). If omitted or set to None, it defaults to “xml”.

xml_declaration= (New in 1.3) If True, always outputs an XML declaration. If False, never outputs an XML declaration. If omitted or None, only outputs a declaration if the encoding is neither US-ASCII nor UTF-8. In ElementTree 1.2, this option is hard-wired to None.

default_namespace= (New in 1.3) Specifies the default namespace to use for this file (an URI). If omitted, all namespaces gets distinct prefixes (usually “ns” plus a number).

In the current alpha, this only works if all elements in the tree belongs to a namespace.

write_c14n #

tree.write_c14n(file)

(New in 1.3) An alias for calling write with the method option set to “c14n”. Using the write method is preferred.

getroot #

tree.getroot() ⇒ element

Fetches the root element.

_setroot #

tree._setroot(element)

Replaces the root element. The old content is discarded.

 

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