Standard implementation is:
```
def process(self, msg, kwargs):
kwargs["extra"] = self.extra
return msg, kwargs
```
so the signature is clearly `(Text, ...) -> (Text, ...)` (or `(str, ...) -> (str, ...)`, but following the other stubs here, I gather it's `Text`).
In python3 `RotatingFileHandler` is a subclass of `BaseRotatingHandler` which is a subclass of `FileHandler` which is a subclass of `StreamHandler` which as a `terminator` property but I'm getting a `"RotatingFileHandler" has no attribute "terminator"` error on my code.
The missing colon in the variable type annotation means that the type of stream is currently incorrectly determined to be of type ellipsis, rather than IO[str].
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.
