Add intelligent indexing of tuples, NamedTuples, and TypedDict #6124
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This pull request adds a preliminary implementation of intelligent indexing of tuples, NamedTuples, and TypedDicts. It uses the first approach we discussed earlier: modifying the existing plugins and special-casing code to also check if the expression has a Literal[...] type. Once I'm finished with the baseline literal types implementation, I'll look into circling back and seeing how viable the second approach is (writing some sort of plugin that replaces the signatures of methods like `.__getitem__` or `.get()` with overloads that use the appropriate literal types).
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msullivan
approved these changes
Jan 4, 2019
| item_name = typ.value | ||
| else: | ||
| self.msg.typeddict_key_must_be_string_literal(td_type, index) | ||
| return AnyType(TypeOfAny.from_error) |
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Maybe not really a question for this diff, but is there a reason for this to not live in the typeddict plugin as a __getitem__ hook?
There is maybe a more relevant question of: could this just use try_getting_str_literal, the answer to which would be more obvious if this lived in the plugin.
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I agree -- I think we should move both this and tuple.__getitem__ out into a plugin, but it felt like it'd be out-of-scope for this PR.
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This pull request adds a preliminary implementation of intelligent indexing of tuples, NamedTuples, and TypedDicts. It uses the first approach we discussed earlier: modifying the existing plugins and special-casing code to also check if the expression has a Literal[...] type.
Once I'm finished with the baseline literal types implementation, I'll look into circling back and seeing how viable the second approach is (writing some sort of plugin that replaces the signatures of methods like
.__getitem__or.get()with overloads that use the appropriate literal types).