csv2lyx.py not working with python3??

[Neal Becker]

 python3 -tt /usr/share/lyx/scripts/csv2lyx.py
all_results-2023-03-06T13:58:32-0.csv all_results-2023-03-06T13:58:32-0.lyx
Traceback (most recent call last):
  File "/usr/share/lyx/scripts/csv2lyx.py", line 170, in <module>
    input_file = "".join(open(infile,'rU').readlines())
                         ^^^^^^^^^^^^^^^^^
ValueError: invalid mode: 'rU'

 python2 -tt /usr/share/lyx/scripts/csv2lyx.py
all_results-2023-03-06T13:58:32-0.csv all_results-2023-03-06T13:58:32-0.lyx
[silence...]

-- 
*Those who don't understand recursion are doomed to repeat it*
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