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| -rw-r--r-- | Doc/library/xml.etree.elementtree.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Doc/library/xml.etree.elementtree.rst b/Doc/library/xml.etree.elementtree.rst index 7725e4d..f4bccf6 100644 --- a/Doc/library/xml.etree.elementtree.rst +++ b/Doc/library/xml.etree.elementtree.rst @@ -251,12 +251,18 @@ We can remove elements using :meth:`Element.remove`. Let's say we want to remove all countries with a rank higher than 50:: >>> for country in root.findall('country'): + ... # using root.findall() to avoid removal during traversal ... rank = int(country.find('rank').text) ... if rank > 50: ... root.remove(country) ... >>> tree.write('output.xml') +Note that concurrent modification while iterating can lead to problems, +just like when iterating and modifying Python lists or dicts. +Therefore, the example first collects all matching elements with +``root.findall()``, and only then iterates over the list of matches. + Our XML now looks like this: .. code-block:: xml |