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It's because SageMathCell is now running SageMath 9.0, which is based on Python 3. So you need to replace all Python-2 print statements by the print() function.
Moreover, the deprecation warning is caused by the \d in the following code line:
nL=re.findall("[-+]?[.]?[\d]+(?:,\d\d\d)*[\.]?\d*(?:[eE][-+]?\d+)?", recurrenceEq)
Maybe you should change the string to a raw string, i.e. prefix it by r:
nL=re.findall(r"[-+]?[.]?[\d]+(?:,\d\d\d)*[\.]?\d*(?:[eE][-+]?\d+)?", recurrenceEq)
