Unexpected error when creating a Dict from a list of lists len 2

[adamtheturtle]

I have the following code which works.

from typing import Dict

my_list = ['a', 'b']
my_dict: Dict[str, str] = dict([my_list])
print(my_dict)  # {'a': 'b'}

mypy gives the following error:

example.py:4: error: List item 0 has incompatible type "List[str]"; expected "Tuple[str, str]"

I expect that in this case mypy would not show an error because the code is valid.

From https://docs.python.org/3/library/stdtypes.html#dict:

Each item in the iterable must itself be an iterable with exactly two objects.

[srittau]

Seems like a typeshed issue. Possibly dict.__init__() is missing an overload like:

    @overload
    def __init__(self, iterable: Iterable[Iterable[Union[_KT, _VT]]], **kwargs: _VT) -> None: ...

[adamtheturtle]

@srittau I'm not yet good a assessing which of these repos issues belong to! I will create a typeshed issue, thank you.

[adamtheturtle]

Closing in favour of python/typeshed#2862.