Don't turn types containing None into partial types (in strict Optional mode) #2289
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gvanrossum
reviewed
Oct 22, 2016
| reveal_type(x) # E: Revealed type is 'builtins.dict[Union[builtins.str, builtins.None], Union[builtins.int, builtins.None]]' | ||
| [builtins fixtures/dict.pyi] | ||
| [out] | ||
| main:2: error: Invalid index type "str" for "dict" |
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off-topic: this ought to be "key type" not "index type".
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This means mypy will no longer give
Need type annotation for variableerrors for assignments with values of typeGenerator[str, None, None]orList[None]or similar. However, lists, sets, and dicts that are initialized with None values that were previously inferred may now need type annotations. I.e. constructs that look like:will now be type errors unless they have explicit annotations.
Supplants #2225. Fixes #2246. Fixes #2195. Fixes #2258.