None is the default value for these two arguments to logging.Logger._log (which
most other stuff in logging delegates to).
I was getting errors in my codebase because mypy now distinguishes between Any
and Optional[Any].
"> (3,)" works but looks like the code is checking for Python 4.
"<= (3, 5)" was intended to check for versions up to and including 3.5, and probably works that
way in current type checkers. However, sys.version_info is actually a 5-tuple that is greater
than (3, 5), so a hypothetical type checker that uses the full version info would interpret
this check incorrectly.
This ensures that all version_info comparisons use <, >=, ==, or !=.
Fixes#720.
Related changes: used a NamedTuple for time.struct_time on Python 3, used
sys.version selectors for proper typing of #716, added missing *Style classes
to logging on Python 3.
Adds several attributes which were missing from the Logger types,
including "name", "level", and "parent". Because the type of "parent"
is a union of Logger and PlaceHolder, we also define types for
PlaceHolder and all of it's methods.
