xml.etree.ElementTree.Element.getchildren
is abolished in python 3.9
#238
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When accessing HDFS using pfio==2.0.0 with Python 3.9 environment, it immediately raises the following error.
This is because configuration parse process calls an abolished function.
https://docs.python.org/3.8/library/xml.etree.elementtree.html#xml.etree.ElementTree.Element.getchildren
https://github.com/pfnet/pfio/blob/2.0.0/pfio/v2/hdfs.py#L153
This PR fixes this issue.
I confirmed the it also works with Python 3.8 environment as well as 3.9.