Replaced deprecated 'rU' with 'r' to make this work on recent python #319
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as per: https://docs.python.org/3/whatsnew/3.11.html#porting-to-python-3-11 'U' has deprecated since python 3.3: python/cpython#81511
and as per: https://docs.python.org/3/library/functions.html, 'U' has been completely removed from Python 3.11