Treat underscore variables as anonymous #3125
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ilevkivskyi
reviewed
Apr 4, 2017
test-data/unit/check-basic.test
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| (_, _) = (1.0, "") | ||
| for (_, _) in ((1, "a"), (2, "b")): pass | ||
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| def f(_: int, _: str) -> None: pass |
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This actually gives SyntaxError: duplicate argument '_' in function definition at runtime (also in Python 2 with annotations removed).
ilevkivskyi
requested changes
Apr 13, 2017
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I see few problems with this PR:
- you mention "fix Allow
Anytypes for tuple except handler tests #1639" in the PR description, but this seems to be a typo, the mentioned PR seems to be unrelated. - We probably should not drop all type checking for variables named
_, the reason is that it is frequently used forgettextand i18n. Possible solutions would be to only drop type checking if_variable is never read, see Type error due to repeated use of underscore as dummy assignment target #465, or maybe keep type checking_if it has an explicitly declared type. - this needs to be documented.
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Thanks. I have fixed the issue reference. |
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There are some ideas in #1332. I will give it some thought. |
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Since we want to continue the usage of |
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Ok. |
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Fix
#1639#1649: allow(_, _) = (1, "")There's no test for usage of underscores. I don't know how to define when and where this is legal (although pretty common in some frameworks)