Errors with mypy 0.740

[max-sixty]

mypy .                    

xarray/core/common.py:337: error: Too few arguments for "__init_subclass__"
xarray/core/dataset.py:398: error: Too few arguments for "__init_subclass__"
xarray/core/dataset.py:873: error: Incompatible default for argument "attrs" (default has type "object", argument has type "Optional[Dict[Hashable, Any]]")
xarray/core/dataset.py:874: error: Incompatible default for argument "indexes" (default has type "object", argument has type "Optional[Dict[Any, Any]]")
xarray/core/dataset.py:875: error: Incompatible default for argument "encoding" (default has type "object", argument has type "Optional[Dict[Any, Any]]")
xarray/core/dataset.py:922: error: Incompatible default for argument "attrs" (default has type "object", argument has type "Optional[Dict[Hashable, Any]]")
xarray/core/dataset.py:923: error: Incompatible default for argument "indexes" (default has type "object", argument has type "Dict[Hashable, Any]")
xarray/core/dataset.py:937: error: Incompatible default for argument "attrs" (default has type "object", argument has type "Dict[Hashable, Any]")
xarray/core/dataarray.py:213: error: Too few arguments for "__init_subclass__"
Found 9 errors in 3 files (checked 122 source files)

mypy --version
mypy 0.740

[crusaderky]

It's a regression in mypy 0.740, already fixed in git tip. python/mypy#7735

[max-sixty]

Great!

Are we OK for the Incompatible default too?

[crusaderky]

That's a change in which line mypy expects the type: ignore to be when you have a multi - line function header and only one of the argument trips an error. The only way to make the code pass both 0.730 and 0.740 is put type: ignore in both places, which I'd rather avoid.

[max-sixty]

Great, so we can make the change when we upgrade on the next release?

[crusaderky]

Correct