basic-programmer-python
diff --git a/‎test-data/unit/check-custom-plugin.test
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diff --git a/‎test-data/unit/check-errorcodes.test
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diff --git a/‎test-data/unit/check-flags.test
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diff --git a/‎test-data/unit/check-incremental.test
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diff --git a/‎test-data/unit/check-literal.test
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diff --git a/‎test-data/unit/check-modules.test
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diff --git a/‎test-data/unit/check-python2.test
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diff --git a/‎test-data/unit/check-semanal-error.test
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diff --git a/‎test-data/unit/check-unreachable-code.test
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@@ -70,7 +70,7 @@ tmp/mypy.ini:2: error: Can't find plugin 'tmp/missing.py'
 \[mypy]
 plugins=missing
 [out]
-tmp/mypy.ini:2: error: Error importing plugin 'missing': No module named 'missing'
+tmp/mypy.ini:2: error: Error importing plugin 'missing': No module named "missing"
 
 [case testMultipleSectionsDefinePlugin]
 # flags: --config-file tmp/mypy.ini
 
@@ -499,13 +499,13 @@ if int() is str():  # E: Non-overlapping identity check (left operand type: "int
 [builtins fixtures/primitives.pyi]
 
 [case testErrorCodeMissingModule]
-from defusedxml import xyz  # E: Cannot find implementation or library stub for module named 'defusedxml'  [import] \
+from defusedxml import xyz  # E: Cannot find implementation or library stub for module named "defusedxml"  [import] \
                             # N: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
-from nonexistent import foobar  # E: Cannot find implementation or library stub for module named 'nonexistent'  [import]
-import nonexistent2  # E: Cannot find implementation or library stub for module named 'nonexistent2'  [import]
-from nonexistent3 import *  # E: Cannot find implementation or library stub for module named 'nonexistent3'  [import]
+from nonexistent import foobar  # E: Cannot find implementation or library stub for module named "nonexistent"  [import]
+import nonexistent2  # E: Cannot find implementation or library stub for module named "nonexistent2"  [import]
+from nonexistent3 import *  # E: Cannot find implementation or library stub for module named "nonexistent3"  [import]
 from pkg import bad  # E: Module 'pkg' has no attribute 'bad'  [attr-defined]
-from pkg.bad2 import bad3  # E: Cannot find implementation or library stub for module named 'pkg.bad2'  [import]
+from pkg.bad2 import bad3  # E: Cannot find implementation or library stub for module named "pkg.bad2"  [import]
 [file pkg/__init__.py]
 
 [case testErrorCodeAlreadyDefined]
 
@@ -453,7 +453,7 @@ main:2: note: (Using --follow-imports=error, module not passed on command line)
 [case testIgnoreMissingImportsFalse]
 from mod import x
 [out]
-main:1: error: Cannot find implementation or library stub for module named 'mod'
+main:1: error: Cannot find implementation or library stub for module named "mod"
 main:1: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 
 [case testIgnoreMissingImportsTrue]
@@ -610,7 +610,7 @@ from missing import MyType
 def f(x: MyType) -> None:
     pass
 [out]
-main:2: error: Cannot find implementation or library stub for module named 'missing'
+main:2: error: Cannot find implementation or library stub for module named "missing"
 main:2: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 main:4: error: Argument 1 to "f" becomes "Any" due to an unfollowed import
 
 
@@ -2135,7 +2135,7 @@ x = 1
 [rechecked n]
 [stale]
 [out2]
-tmp/n.py:1: error: Cannot find implementation or library stub for module named 'm'
+tmp/n.py:1: error: Cannot find implementation or library stub for module named "m"
 tmp/n.py:1: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 
 [case testDeleteFileWithinCycle]
@@ -3433,7 +3433,7 @@ import a
 [out1]
 
 [out2]
-main:2: error: Cannot find implementation or library stub for module named 'a'
+main:2: error: Cannot find implementation or library stub for module named "a"
 main:2: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 
 [case testIncrementalInheritanceAddAnnotation]
@@ -3576,7 +3576,7 @@ def f() -> None: pass
 def f(x: int) -> None: pass
 [out]
 [out2]
-main:1: error: Cannot find implementation or library stub for module named 'p.q'
+main:1: error: Cannot find implementation or library stub for module named "p.q"
 main:1: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 [out3]
 main:2: error: Too few arguments for "f"
@@ -4198,10 +4198,10 @@ def __getattr__(attr: str) -> Any: ...
 # empty
 [builtins fixtures/module.pyi]
 [out]
-tmp/c.py:1: error: Cannot find implementation or library stub for module named 'a.b.c'
+tmp/c.py:1: error: Cannot find implementation or library stub for module named "a.b.c"
 tmp/c.py:1: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 [out2]
-tmp/c.py:1: error: Cannot find implementation or library stub for module named 'a.b.c'
+tmp/c.py:1: error: Cannot find implementation or library stub for module named "a.b.c"
 tmp/c.py:1: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 
 [case testAddedMissingStubs]
 
@@ -867,7 +867,7 @@ func(f)  # E: Argument 1 to "func" has incompatible type "Union[Literal['foo'],
 [case testLiteralDisallowAny]
 from typing import Any
 from typing_extensions import Literal
-from missing_module import BadAlias     # E: Cannot find implementation or library stub for module named 'missing_module' \
+from missing_module import BadAlias     # E: Cannot find implementation or library stub for module named "missing_module" \
                                         # N: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 
 a: Literal[Any]                         # E: Parameter 1 of Literal[...] cannot be of type "Any"
 
@@ -208,7 +208,7 @@ else:
 import nonexistent
 None + ''
 [out]
-main:1: error: Cannot find implementation or library stub for module named 'nonexistent'
+main:1: error: Cannot find implementation or library stub for module named "nonexistent"
 main:1: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 main:2: error: Unsupported left operand type for + ("None")
 
@@ -220,7 +220,7 @@ m.x = ''
 [file m.py]
 x = 1
 [out]
-main:1: error: Cannot find implementation or library stub for module named 'nonexistent'
+main:1: error: Cannot find implementation or library stub for module named "nonexistent"
 main:1: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 main:2: error: Unsupported left operand type for + ("None")
 main:4: error: Incompatible types in assignment (expression has type "str", variable has type "int")
@@ -233,7 +233,7 @@ m.x = ''
 [file m.py]
 x = 1
 [out]
-main:1: error: Cannot find implementation or library stub for module named 'nonexistent'
+main:1: error: Cannot find implementation or library stub for module named "nonexistent"
 main:1: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 main:2: error: Unsupported left operand type for + ("None")
 main:4: error: Incompatible types in assignment (expression has type "str", variable has type "int")
@@ -242,32 +242,32 @@ main:4: error: Incompatible types in assignment (expression has type "str", vari
 import nonexistent, another
 None + ''
 [out]
-main:1: error: Cannot find implementation or library stub for module named 'nonexistent'
+main:1: error: Cannot find implementation or library stub for module named "nonexistent"
 main:1: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
-main:1: error: Cannot find implementation or library stub for module named 'another'
+main:1: error: Cannot find implementation or library stub for module named "another"
 main:2: error: Unsupported left operand type for + ("None")
 
 [case testTypeCheckWithUnknownModule5]
 import nonexistent as x
 None + ''
 [out]
-main:1: error: Cannot find implementation or library stub for module named 'nonexistent'
+main:1: error: Cannot find implementation or library stub for module named "nonexistent"
 main:1: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 main:2: error: Unsupported left operand type for + ("None")
 
 [case testTypeCheckWithUnknownModuleUsingFromImport]
 from nonexistent import x
 None + ''
 [out]
-main:1: error: Cannot find implementation or library stub for module named 'nonexistent'
+main:1: error: Cannot find implementation or library stub for module named "nonexistent"
 main:1: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 main:2: error: Unsupported left operand type for + ("None")
 
 [case testTypeCheckWithUnknownModuleUsingImportStar]
 from nonexistent import *
 None + ''
 [out]
-main:1: error: Cannot find implementation or library stub for module named 'nonexistent'
+main:1: error: Cannot find implementation or library stub for module named "nonexistent"
 main:1: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 main:2: error: Unsupported left operand type for + ("None")
 
@@ -276,24 +276,24 @@ import xyz
 xyz.foo()
 xyz()
 [out]
-main:1: error: Cannot find implementation or library stub for module named 'xyz'
+main:1: error: Cannot find implementation or library stub for module named "xyz"
 main:1: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 
 [case testAccessingUnknownModule2]
 import xyz, bar
 xyz.foo()
 bar()
 [out]
-main:1: error: Cannot find implementation or library stub for module named 'xyz'
+main:1: error: Cannot find implementation or library stub for module named "xyz"
 main:1: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
-main:1: error: Cannot find implementation or library stub for module named 'bar'
+main:1: error: Cannot find implementation or library stub for module named "bar"
 
 [case testAccessingUnknownModule3]
 import xyz as z
 xyz.foo()
 z()
 [out]
-main:1: error: Cannot find implementation or library stub for module named 'xyz'
+main:1: error: Cannot find implementation or library stub for module named "xyz"
 main:1: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 main:2: error: Name 'xyz' is not defined
 
@@ -302,14 +302,14 @@ from xyz import y, z
 y.foo()
 z()
 [out]
-main:1: error: Cannot find implementation or library stub for module named 'xyz'
+main:1: error: Cannot find implementation or library stub for module named "xyz"
 main:1: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 
 [case testAccessingNameImportedFromUnknownModule2]
 from xyz import *
 y
 [out]
-main:1: error: Cannot find implementation or library stub for module named 'xyz'
+main:1: error: Cannot find implementation or library stub for module named "xyz"
 main:1: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 main:2: error: Name 'y' is not defined
 
@@ -318,14 +318,14 @@ from xyz import y as z
 y
 z
 [out]
-main:1: error: Cannot find implementation or library stub for module named 'xyz'
+main:1: error: Cannot find implementation or library stub for module named "xyz"
 main:1: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 main:2: error: Name 'y' is not defined
 
 [case testUnknownModuleRedefinition]
 # Error messages differ with the new analyzer
 
-import xab  # E: Cannot find implementation or library stub for module named 'xab'  # N: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
+import xab  # E: Cannot find implementation or library stub for module named "xab"  # N: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 def xab(): pass  # E: Name 'xab' already defined (possibly by an import)
 
 [case testAccessingUnknownModuleFromOtherModule]
@@ -336,7 +336,7 @@ x.z
 import nonexistent
 [builtins fixtures/module.pyi]
 [out]
-tmp/x.py:1: error: Cannot find implementation or library stub for module named 'nonexistent'
+tmp/x.py:1: error: Cannot find implementation or library stub for module named "nonexistent"
 tmp/x.py:1: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 main:3: error: Module has no attribute "z"
 
@@ -346,7 +346,7 @@ def f():
 def foobar(): pass
 foobar('')
 [out]
-main:2: error: Cannot find implementation or library stub for module named 'foobar'
+main:2: error: Cannot find implementation or library stub for module named "foobar"
 main:2: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 main:4: error: Too many arguments for "foobar"
 
@@ -356,7 +356,7 @@ def f():
 def x(): pass
 x('')
 [out]
-main:2: error: Cannot find implementation or library stub for module named 'foobar'
+main:2: error: Cannot find implementation or library stub for module named "foobar"
 main:2: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 main:4: error: Too many arguments for "x"
 
@@ -2178,8 +2178,8 @@ import c
 
 [out]
 -- TODO: it would be better for this to be in the other order
-tmp/b.py:1: error: Cannot find implementation or library stub for module named 'c'
-main:1: error: Cannot find implementation or library stub for module named 'c'
+tmp/b.py:1: error: Cannot find implementation or library stub for module named "c"
+main:1: error: Cannot find implementation or library stub for module named "c"
 main:1: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 
 [case testIndirectFromImportWithinCycle1]
@@ -2311,7 +2311,7 @@ from typing import Any
 def __getattr__(attr: str) -> Any: ...
 [builtins fixtures/module.pyi]
 [out]
-main:1: error: Cannot find implementation or library stub for module named 'a.b'
+main:1: error: Cannot find implementation or library stub for module named "a.b"
 main:1: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 
 [case testModuleGetattrInit4]
@@ -2356,12 +2356,12 @@ def __getattr__(attr: str) -> Any: ...
 # empty (i.e. complete subpackage)
 [builtins fixtures/module.pyi]
 [out]
-main:1: error: Cannot find implementation or library stub for module named 'a.b.c.d'
+main:1: error: Cannot find implementation or library stub for module named "a.b.c.d"
 main:1: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
-main:1: error: Cannot find implementation or library stub for module named 'a.b.c'
+main:1: error: Cannot find implementation or library stub for module named "a.b.c"
 
 [case testModuleGetattrInit8a]
-import a.b.c  # E: Cannot find implementation or library stub for module named 'a.b.c'  # N: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
+import a.b.c  # E: Cannot find implementation or library stub for module named "a.b.c"  # N: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 import a.d  # OK
 [file a/__init__.pyi]
 from typing import Any
@@ -2387,7 +2387,7 @@ def __getattr__(attr: str) -> Any: ...
 ignore_missing_imports = True
 [builtins fixtures/module.pyi]
 [out]
-main:3: error: Cannot find implementation or library stub for module named 'a.b.d'
+main:3: error: Cannot find implementation or library stub for module named "a.b.d"
 main:3: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 
 [case testIndirectFromImportWithinCycleUsedAsBaseClass]
@@ -2619,7 +2619,7 @@ from foo.bar import x
 [file foo/bar.py]
 x = 0
 [out]
-main:1: error: Cannot find implementation or library stub for module named 'foo.bar'
+main:1: error: Cannot find implementation or library stub for module named "foo.bar"
 main:1: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 
 [case testNamespacePackage]
 
@@ -167,7 +167,7 @@ main:8: error: Argument 2 to "f" has incompatible type "int"; expected "Tuple[in
 import asyncio
 import Bastion
 [out]
-main:1: error: Cannot find implementation or library stub for module named 'asyncio'
+main:1: error: Cannot find implementation or library stub for module named "asyncio"
 main:1: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 main:2: error: No library stub file for standard library module 'Bastion'
 main:2: note: (Stub files are from https://github.com/python/typeshed)
 
@@ -18,7 +18,7 @@ m.foo()
 m.x = m.y
 1() # E
 [out]
-main:1: error: Cannot find implementation or library stub for module named 'm'
+main:1: error: Cannot find implementation or library stub for module named "m"
 main:1: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 main:4: error: "int" not callable
 
@@ -28,7 +28,7 @@ x.foo()
 x.a = x.b
 1() # E
 [out]
-main:1: error: Cannot find implementation or library stub for module named 'm'
+main:1: error: Cannot find implementation or library stub for module named "m"
 main:1: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 main:4: error: "int" not callable
 
@@ -37,7 +37,7 @@ from m import * # E
 x # E
 1() # E
 [out]
-main:1: error: Cannot find implementation or library stub for module named 'm'
+main:1: error: Cannot find implementation or library stub for module named "m"
 main:1: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 main:2: error: Name 'x' is not defined
 main:3: error: "int" not callable
 
@@ -78,7 +78,7 @@ else:
     import pow123 # E
 [builtins fixtures/bool.pyi]
 [out]
-main:6: error: Cannot find implementation or library stub for module named 'pow123'
+main:6: error: Cannot find implementation or library stub for module named "pow123"
 main:6: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 
 [case testMypyConditional]
@@ -98,7 +98,7 @@ else:
     import xyz753
 [typing fixtures/typing-medium.pyi]
 [out]
-main:3: error: Cannot find implementation or library stub for module named 'pow123'
+main:3: error: Cannot find implementation or library stub for module named "pow123"
 main:3: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 
 [case testTypeCheckingConditionalFromImport]
@@ -109,7 +109,7 @@ else:
     import xyz753
 [typing fixtures/typing-medium.pyi]
 [out]
-main:3: error: Cannot find implementation or library stub for module named 'pow123'
+main:3: error: Cannot find implementation or library stub for module named "pow123"
 main:3: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 
 [case testNegatedTypeCheckingConditional]
@@ -121,7 +121,7 @@ else:
 [builtins fixtures/bool.pyi]
 [typing fixtures/typing-medium.pyi]
 [out]
-main:5: error: Cannot find implementation or library stub for module named 'xyz753'
+main:5: error: Cannot find implementation or library stub for module named "xyz753"
 main:5: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 
 [case testUndefinedTypeCheckingConditional]
@@ -132,7 +132,7 @@ else:
 [builtins fixtures/bool.pyi]
 [out]
 main:1: error: Name 'TYPE_CHECKING' is not defined
-main:4: error: Cannot find implementation or library stub for module named 'xyz753'
+main:4: error: Cannot find implementation or library stub for module named "xyz753"
 main:4: note: See https://mypy.readthedocs.io/en/latest/running_mypy.html#missing-imports
 
 [case testConditionalClassDefPY3]