Fix simplification of some unions #2718
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The reason I made this is because #2714 generates many new errors when run against internal Dropbox repos, and I'd rather not track these down right now. This should be enough to let us use recent typeshed revisions (together with some other fixes). The new errors caused by #2714 look mostly legitimate, though, and we'll want to investigate them eventually. |
JukkaL
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Without this change, mypy can't infer proper types for cases like `d.get(k, [])` where it needs type context to infer the type of `[]`. We add the value type to the second argument to `get` using union types, and this provides the context. This doesn't affect the effective signature of `get`, other than providing the type context for mypy. Also removed some related redundant method definitions where we can just inherit the base class definition. This makes it easier to keep the method signatures consistent. Note that this requires a few mypy PRs before mypy will be able to use this effectively: * python/mypy#2718 * python/mypy#2715
gvanrossum
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Without this change, mypy can't infer proper types for cases like `d.get(k, [])` where it needs type context to infer the type of `[]`. We add the value type to the second argument to `get` using union types, and this provides the context. This doesn't affect the effective signature of `get`, other than providing the type context for mypy. Also removed some related redundant method definitions where we can just inherit the base class definition. This makes it easier to keep the method signatures consistent. Note that this requires a few mypy PRs before mypy will be able to use this effectively: * python/mypy#2718 * python/mypy#2715
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In particular, this helps with classes that have Any base classes.
This is enough to fix #2712. This is almost a subset of #2714
and should land before that, as this should cause less disruption.