ModuleNotFoundError: No module named 'base64'

Error:

└─> $  sudo dnf update
Traceback (most recent call last):
  File "/bin/dnf", line 57, in <module>
    from dnf.cli import main
  File "/usr/lib/python3.6/site-packages/dnf/__init__.py", line 23, in <module>
    import dnf.pycomp
  File "/usr/lib/python3.6/site-packages/dnf/pycomp.py", line 23, in <module>
    import base64
ModuleNotFoundError: No module named 'base64'

Solution:

Download the base64.py from the "https://github.com/python/cpython/blob/3.8/Lib/base64.py" and copied it into the /usr/lib64/python3.6/".