type fixes for pep 484 compliance #3181
Merged
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Made some type fixes for compliance with pep 484.
PEP 484 prohibits the use of implicit optional. For example, the following piece of code allows assumption of implicit optional:
def foo(a: int = None): ...
. It allows type checkers to assume an optional type ofNone
fora
. To comply with PEP 484, it should bedef foo(a: Optional[int] = None): ...
.The latest mypy version (0.991, release blog) had a breaking change which disabled implicit optionals type. Hence, it was not detected earlier by mypy.