Python3 mergemap tool doesn't work

[FPSychotic]

$ python3 makeMergedMap.py makeMergedMap.py:88: SyntaxWarning: "is not" with a literal. Did you mean "!="? if( nodes_count % node_skip is not 0): Traceback (most recent call last): File "makeMergedMap.py", line 8, in <module> from pypcd import pypcd File "/home/nrover/.local/lib/python3.8/site-packages/pypcd/pypcd.py", line 15, in <module> import cStringIO as sio ModuleNotFoundError: No module named 'cStringIO'

Thanks!