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Avoid cElementTree on Python 3 #494
Description
cElementTree has been deprecated since 3.3, and is simply an alias to ElementTree right now. It will be removed in the Python 3.10.
Originally filed as: pypa/pip#8278
See also: python/cpython#19921
Activity
gsnedders commentedon May 22, 2020
What prompts the desire to avoid it? Avoiding the PendingDeprecationWarning proposed to be added in python/cpython#19921 but not python/cpython#20117? This this causes warnings with the perfectly sane
try/except ImportErrorthat's so prevalent and future-proof seems ridiculous.uranusjr commentedon May 22, 2020
cc-ing @tiran since I do not have the knowledge to answer the question myself.
tiran commentedon May 23, 2020
The removal of cElementTree without a deadline and deprecation warning broke a bunch of packages. I like to re-introduce the module in 3.9 with a warning and remove it in 3.10.
The warning is breaking Python's ensurepip tests. Pip depends on html5lib and html5lib triggers the warning. My patch avoids the warning and keeps the behavior of html5lib. If you want a simpler patch, then just import
xml.etree.ElementTreein all Python versions. This works in Python 2, but it's going to slow down parsing on Python 2 a bit.