Traceback (most recent call last):
File "/opt/bess/bessctl/./bessctl", line 42, in <module>
import commands
File "/opt/bess/bessctl/commands.py", line 52, in <module>
import sugar
File "/opt/bess/bessctl/sugar.py", line 34, in <module>
import parser
ModuleNotFoundError: No module named 'parser'
Removed the parser module, which was deprecated in 3.9 due to the switch to the new PEG parser, as well as all the C source and header files that were only being used by the old parser, including node.h, parser.h, graminit.h and grammar.h.
https://docs.python.org/3/library/parser.html
https://docs.python.org/3.10/whatsnew/3.10.html#removed