1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
[case testClassVarDef]
from typing import ClassVar
class A:
x = 1 # type: ClassVar[int]
[out]
MypyFile:1(
ImportFrom:1(typing, [ClassVar])
ClassDef:2(
A
AssignmentStmt:3(
NameExpr(x [m])
IntExpr(1)
builtins.int)))
[case testClassVarDefInModuleScope]
from typing import ClassVar
x = None # type: ClassVar[int]
[out]
main:2: error: ClassVar can only be used for assignments in class body
[case testClassVarDefInFuncScope]
from typing import ClassVar
def f() -> None:
x = None # type: ClassVar[int]
[out]
main:3: error: ClassVar can only be used for assignments in class body
[case testClassVarDefInMethod]
from typing import ClassVar
class A:
def f(self) -> None:
x = None # type: ClassVar
[out]
main:4: error: ClassVar can only be used for assignments in class body
[case testClassVarTooManyArguments]
from typing import ClassVar
class A:
x = 1 # type: ClassVar[int, str]
[out]
main:3: error: ClassVar[...] must have at most one type argument
[case testClassVarWithoutArguments]
from typing import ClassVar
class A:
x = 1 # type: ClassVar
[out]
MypyFile:1(
ImportFrom:1(typing, [ClassVar])
ClassDef:2(
A
AssignmentStmt:3(
NameExpr(x [m])
IntExpr(1)
Any)))
[case testClassVarWithTypeVar]
from typing import ClassVar, TypeVar
T = TypeVar('T')
class A:
x = None # type: ClassVar[T]
[out]
main:5: error: Type variable "__main__.T" is unbound
main:5: note: (Hint: Use "Generic[T]" or "Protocol[T]" base class to bind "T" inside a class)
main:5: note: (Hint: Use "T" in function signature to bind "T" inside a function)
[case testClassVarInFunctionArgs]
from typing import ClassVar
def f(x: str, y: ClassVar) -> None: pass
[out]
main:2: error: ClassVar can only be used for assignments in class body
[case testClassVarInMethodArgs]
from typing import ClassVar
class A:
def f(x: str, y: ClassVar) -> None: pass
[out]
main:3: error: ClassVar can only be used for assignments in class body
[case testClassVarFunctionRetType]
from typing import ClassVar
def f() -> ClassVar: pass
[out]
main:2: error: ClassVar can only be used for assignments in class body
[case testClassVarMethodRetType]
from typing import ClassVar
class A:
def f(self) -> ClassVar: pass
[out]
main:3: error: ClassVar can only be used for assignments in class body
[case testMultipleClassVarInFunctionSig]
from typing import ClassVar
def f(x: ClassVar, y: ClassVar) -> ClassVar: pass
[out]
main:2: error: ClassVar can only be used for assignments in class body
[case testClassVarInCallableArgs]
from typing import Callable, ClassVar, Any
f = None # type: Callable[[int, ClassVar], Any]
[out]
main:2: error: Invalid type: ClassVar nested inside other type
[case testClassVarInCallableRet]
from typing import Callable, ClassVar
f = None # type: Callable[..., ClassVar]
[out]
main:2: error: Invalid type: ClassVar nested inside other type
[case testClassVarInUnion]
from typing import ClassVar, Union
x = None # type: Union[ClassVar, str]
[out]
main:2: error: Invalid type: ClassVar nested inside other type
[case testClassVarInUnionAsAttribute]
from typing import ClassVar, Union
class A:
x = None # type: Union[ClassVar, str]
[out]
main:3: error: Invalid type: ClassVar nested inside other type
[case testListWithClassVars]
from typing import ClassVar, List
x = [] # type: List[ClassVar]
[builtins fixtures/list.pyi]
[out]
main:2: error: Invalid type: ClassVar nested inside other type
[case testTupleClassVar]
from typing import ClassVar, Tuple
x = None # type: Tuple[ClassVar, int]
[builtins fixtures/tuple.pyi]
[out]
main:2: error: Invalid type: ClassVar nested inside other type
[case testMultipleLvaluesWithList]
from typing import ClassVar, Tuple
class A:
[x, y] = None, None # type: Tuple[ClassVar, ClassVar]
[builtins fixtures/tuple.pyi]
[out]
main:3: error: Invalid type: ClassVar nested inside other type
[case testDeeplyNested]
from typing import Callable, ClassVar, Union
class A: pass
class B:
x = None # type: Union[str, Callable[[A, ClassVar], int]]
[out]
main:4: error: Invalid type: ClassVar nested inside other type
[case testClassVarInClassVar]
from typing import ClassVar
class A:
x = None # type: ClassVar[ClassVar[int]]
[out]
main:3: error: Invalid type: ClassVar nested inside other type
[case testInsideGeneric]
from typing import ClassVar, Generic, TypeVar
T = TypeVar('T')
class A(Generic[T]): pass
class B:
x = None # type: A[ClassVar]
[out]
main:5: error: Invalid type: ClassVar nested inside other type
[case testDefineOnSelf]
from typing import ClassVar
class A:
def __init__(self) -> None:
self.x = None # type: ClassVar
[out]
main:4: error: ClassVar can only be used for assignments in class body
[case testForIndex]
from typing import ClassVar
for i in []: # type: ClassVar
pass
[out]
main:2: error: ClassVar can only be used for assignments in class body
[case testForIndexInClassBody]
from typing import ClassVar
class A:
for i in []: # type: ClassVar
pass
[out]
main:3: error: ClassVar can only be used for assignments in class body
[case testWithStmt]
from typing import ClassVar
class A: pass
with A() as x: # type: ClassVar
pass
[out]
main:3: error: ClassVar can only be used for assignments in class body
[case testWithStmtInClassBody]
from typing import ClassVar
class A: pass
class B:
with A() as x: # type: ClassVar
pass
[out]
main:4: error: ClassVar can only be used for assignments in class body
[case testClassVarWithTypeVariable]
from typing import ClassVar, TypeVar, Generic, List
T = TypeVar('T')
class Some(Generic[T]):
error: ClassVar[T] # E: ClassVar cannot contain type variables
nested: ClassVar[List[List[T]]] # E: ClassVar cannot contain type variables
ok: ClassVar[int]
[out]
|
