open() mode 'rU' invalid mode

[gruenbergera]

Hello,

It looks like on line 480 of AnnotatorCore.py, open(eventfile, 'rU'), the mode for open() is set as rU. I believe python 3.11+ no longer has U as one of the valid modes, which causes some run time issues as is (if you're using 3.11 and newer, of course).

open()](https://docs.python.org/3/library/functions.html#open), io.open(), codecs.open() and fileinput.FileInput no longer accept 'U' (“universal newline”) in the file mode. In Python 3, “universal newline” mode is used by default whenever a file is opened in text mode, and the 'U' flag has been deprecated since Python 3.3. The newline parameter to these functions controls how universal newlines work. (Contributed by Victor Stinner in bpo-37330.)

https://docs.python.org/3/whatsnew/3.11.html#porting-to-python-3-11

In any case, whether this is a real issue or not, I appreciate the great work your organization contributes to the research community.

[zhx828]

Thank you! We will look into.