Skip rest of file upon top-level always-false assert #5894
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added 3 commits
November 14, 2018 15:10
- A top-level assert has no indentation. - An always-false condition is a check for sys.platform or sys.version_info or a condition derived from MYPY or from a name passed to --always-false; `assert False` doesn't count (!). Fixes python#5308
JukkaL
reviewed
Nov 14, 2018
docs/source/common_issues.rst
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| @@ -382,6 +382,22 @@ More specifically, mypy will understand the use of ``sys.version_info`` and | |||
| else: | |||
| # Other systems | |||
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| As a special case, you can also use one of these checks in a top-level | |||
| ``assert``; this makes mypy skip the rest of the file. Example: | |||
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Maybe explicitly mention that the assert must be unconditional and not nested within a statement.
| @@ -623,3 +623,51 @@ class Child(Parent): | |||
| reveal_type(self) # E: Revealed type is '__main__.Child' | |||
| return 3 | |||
| [builtins fixtures/isinstance.pyi] | |||
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| [case testUnreachableAfterToplevelAssert] | |||
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Maybe also test the case where the assert is nested within an if statement.
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OK, updated doc and added test. |
JukkaL
approved these changes
Nov 15, 2018
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A top-level assert has no indentation.
An always-false condition is a check for
sys.platformorsys.version_infoor a condition derived fromMYPYor from a namepassed to
--always-false;assert Falsedoesn't count (!).(This definition is the same used to exclude conditional imports.)
Fixes #5308.