OCI: DNF/YUM Failure Due to Missing Python Bytecode Files and Broken Dependencies

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Applies To:
Oracle Cloud Infrastructure
Oracle Linux 8

Symptoms:

• Running dnf or yum gives traceback errors
• Python exception:

#sudo dnf update
File "/usr/bin/dnf", line 61, in <module>
    from dnf.cli import main
...
AttributeError: module 'libdnf.transaction' has no attribute 'TransactionItemAction_DOWNGRADE'

• Many .pyc files under /usr/lib/python3.6/site-packages/dnf/__pycache__ are missing:

#rpm -Va | grep missing
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/__init__.cpython-36.opt-1.pyc missing /usr/lib/python3.6/site-packages/dnf/__pycache__/base.cpython-36.opt-1.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/callback.cpython-36.opt-1.pyc missing /usr/lib/python3.6/site-packages/dnf/__pycache__/comps.cpython-36.opt-1.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/const.cpython-36.opt-1.pyc missing /usr/lib/python3.6/site-packages/dnf/__pycache__/crypto.cpython-36.opt-1.pyc missing /usr/lib/python3.6/site-packages/dnf/__pycache__/crypto.cpython-36.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/dnssec.cpython-36.opt-1.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/dnssec.cpython-36.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/drpm.cpython-36.opt-1.pyc missing /usr/lib/python3.6/site-packages/dnf/__pycache__/drpm.cpython-36.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/exceptions.cpython-36.opt-1.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/goal.cpython-36.opt-1.pyc missing /usr/lib/python3.6/site-packages/dnf/__pycache__/goal.cpython-36.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/history.cpython-36.opt-1.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/history.cpython-36.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/i18n.cpython-36.opt-1.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/lock.cpython-36.opt-1.pyc missing /usr/lib/python3.6/site-packages/dnf/__pycache__/lock.cpython-36.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/logging.cpython-36.opt-1.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/logging.cpython-36.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/match_counter.cpython-36.opt-1.pyc missing /usr/lib/python3.6/site packages/dnf/__pycache__/match_counter.cpython-36.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/package.cpython-36.opt-1.pyc missing /usr/lib/python3.6/site-packages/dnf/__pycache__/package.cpython-36.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/persistor.cpython-36.opt-1.pyc missing /usr/lib/python3.6/site-packages/dnf/__pycache__/persistor.cpython-36.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/plugin.cpython-36.opt-1.pyc missing /usr/lib/python3.6/site-packages/dnf/__pycache__/plugin.cpython-36.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/pycomp.cpython-36.opt-1.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/query.cpython-36.opt-1.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/query.cpython-36.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/repo.cpython-36.opt-1.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/repo.cpython-36.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/repodict.cpython-36.opt-1.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/repodict.cpython-36.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/sack.cpython-36.opt-1.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/sack.cpython-36.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/selector.cpython-36.opt-1.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/selector.cpython-36.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/subject.cpython-36.opt-1.pyc missing /usr/lib/python3.6/site-packages/dnf/__pycache__/subject.cpython-36.pyc 
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/transaction.cpython-36.opt-1.pyc missing /usr/lib/python3.6/site-packages/dnf/__pycache__/transaction_sr.cpython-36.opt-1.pyc
missing /usr/lib/python3.6/site-packages/dnf/__pycache__/transaction_sr.cpython-36.pyc missing /usr/lib/python3.6/site-packages/dnf/__pycache__/util.cpython-36.opt-1.pyc