[issue46332] Use raise..from in logging/config instead of assigning __cause__

[Irit Katriel]

Irit Katriel <iritkatriel at gmail.com> added the comment:

Lib/logging/config.py has this, which looks like it's partly remnants of old exception handling APIs: 

except ImportError:
    e, tb = sys.exc_info()[1:]
    v = ValueError('Cannot resolve %r: %s' % (s, e))
    v.__cause__, v.__traceback__ = e, tb
    raise v

It is clearer if written as:

except ImportError as e:
    v = ValueError('Cannot resolve %r: %s' % (s, e))
    raise v from e


(note that this doesn't copy the traceback from e to v, but this is redundant information anyway because e is chained to v as the cause).

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<https://bugs.python.org/issue46332>
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