check-namedtuple.test

[case testNamedTupleUsedAsTuple]
from collections import namedtuple

X = namedtuple('X', 'x y')
x = None  # type: X
a, b = x
b = x[0]
a = x[1]
a, b, c = x # E: Need more than 2 values to unpack (3 expected)
x[2] # E: Tuple index out of range
[builtins fixtures/tuple.pyi]

[case testNamedTupleWithTupleFieldNamesUsedAsTuple]
from collections import namedtuple

X = namedtuple('X', ('x', 'y'))
x = None  # type: X
a, b = x
b = x[0]
a = x[1]
a, b, c = x # E: Need more than 2 values to unpack (3 expected)
x[2] # E: Tuple index out of range
[builtins fixtures/tuple.pyi]

[case testNamedTupleUnicode_python2]
from __future__ import unicode_literals
from collections import namedtuple

# This test is a regression test for a bug where mypyc-compiled mypy
# would crash on namedtuple's with unicode arguments. Our test stubs
# don't actually allow that, though, so we ignore the error and just
# care we don't crash.
X = namedtuple('X', ('x', 'y'))  # type: ignore

[case testNamedTupleNoUnderscoreFields]
from collections import namedtuple

X = namedtuple('X', 'x, _y, _z')  # E: "namedtuple()" field names cannot start with an underscore: _y, _z
[builtins fixtures/tuple.pyi]

[case testNamedTupleAccessingAttributes]
from collections import namedtuple

X = namedtuple('X', 'x y')
x = None  # type: X
x.x
x.y
x.z # E: "X" has no attribute "z"
[builtins fixtures/tuple.pyi]

[case testNamedTupleClassPython35]
# flags: --python-version 3.5
from typing import NamedTuple

class A(NamedTuple):
    x = 3  # type: int
[builtins fixtures/tuple.pyi]
[out]
main:4: error: NamedTuple class syntax is only supported in Python 3.6

[case testNamedTupleClassInStubPython35]
# flags: --python-version 3.5
import foo

[file foo.pyi]
from typing import NamedTuple

class A(NamedTuple):
    x: int
[builtins fixtures/tuple.pyi]

[case testNamedTupleAttributesAreReadOnly]
from collections import namedtuple

X = namedtuple('X', 'x y')
x = None  # type: X
x.x = 5 # E: Property "x" defined in "X" is read-only
x.y = 5 # E: Property "y" defined in "X" is read-only
x.z = 5 # E: "X" has no attribute "z"

class A(X): pass
a = None  # type: A
a.x = 5 # E: Property "x" defined in "X" is read-only
a.y = 5 # E: Property "y" defined in "X" is read-only
-- a.z = 5 # not supported yet
[builtins fixtures/tuple.pyi]


[case testTypingNamedTupleAttributesAreReadOnly]
from typing import NamedTuple
from typing_extensions import Protocol

class HasX(Protocol):
    x: str

class A(NamedTuple):
    x: str

a: HasX = A("foo")
a.x = "bar"
[builtins fixtures/tuple.pyi]
[out]
main:10: error: Incompatible types in assignment (expression has type "A", variable has type "HasX")
main:10: note: Protocol member HasX.x expected settable variable, got read-only attribute


[case testNamedTupleCreateWithPositionalArguments]
from collections import namedtuple

X = namedtuple('X', 'x y')
x = X(1, 'x')
x.x
x.z      # E: "X" has no attribute "z"
x = X(1) # E: Missing positional argument "y" in call to "X"
x = X(1, 2, 3)  # E: Too many arguments for "X"
[builtins fixtures/tuple.pyi]

[case testCreateNamedTupleWithKeywordArguments]
from collections import namedtuple

X = namedtuple('X', 'x y')
x = X(x=1, y='x')
x = X(1, y='x')
x = X(x=1, z=1) # E: Unexpected keyword argument "z" for "X"
x = X(y=1) # E: Missing positional argument "x" in call to "X"
[builtins fixtures/tuple.pyi]

[case testNamedTupleCreateAndUseAsTuple]
from collections import namedtuple

X = namedtuple('X', 'x y')
x = X(1, 'x')
a, b = x
a, b, c = x  # E: Need more than 2 values to unpack (3 expected)
[builtins fixtures/tuple.pyi]

[case testNamedTupleAdditionalArgs]
from collections import namedtuple

A = namedtuple('A', 'a b')
B = namedtuple('B', 'a b', rename=1)
C = namedtuple('C', 'a b', rename='not a bool')
D = namedtuple('D', 'a b', unrecognized_arg=False)
E = namedtuple('E', 'a b', 0)

[builtins fixtures/bool.pyi]

[out]
main:5: error: Argument "rename" to "namedtuple" has incompatible type "str"; expected "int"
main:6: error: Unexpected keyword argument "unrecognized_arg" for "namedtuple"
<ROOT>/test-data/unit/lib-stub/collections.pyi:3: note: "namedtuple" defined here
main:7: error: Too many positional arguments for "namedtuple"

[case testNamedTupleDefaults]
# flags: --python-version 3.7
from collections import namedtuple

X = namedtuple('X', ['x', 'y'], defaults=(1,))

X()  # E: Missing positional argument "x" in call to "X"
X(0)  # ok
X(0, 1)  # ok
X(0, 1, 2)  # E: Too many arguments for "X"

Y = namedtuple('Y', ['x', 'y'], defaults=(1, 2, 3))  # E: Too many defaults given in call to "namedtuple()"
Z = namedtuple('Z', ['x', 'y'], defaults='not a tuple')  # E: List or tuple literal expected as the defaults argument to namedtuple()  # E: Argument "defaults" to "namedtuple" has incompatible type "str"; expected "Optional[Iterable[Any]]"

[builtins fixtures/list.pyi]

[case testNamedTupleWithItemTypes]
from typing import NamedTuple
N = NamedTuple('N', [('a', int),
                     ('b', str)])
n = N(1, 'x')
s = n.a # type: str  # E: Incompatible types in assignment (expression has type "int", \
                          variable has type "str")
i = n.b # type: int  # E: Incompatible types in assignment (expression has type "str", \
                          variable has type "int")
x, y = n
if int():
    x = y  # E: Incompatible types in assignment (expression has type "str", variable has type "int")
[targets __main__, __main__.N.__new__, __main__.N._asdict, __main__.N._make, __main__.N._replace]
[builtins fixtures/tuple.pyi]


[case testNamedTupleWithTupleFieldNamesWithItemTypes]
from typing import NamedTuple
N = NamedTuple('N', (('a', int),
                     ('b', str)))
n = N(1, 'x')
s = n.a # type: str  # E: Incompatible types in assignment (expression has type "int", \
                          variable has type "str")
i = n.b # type: int  # E: Incompatible types in assignment (expression has type "str", \
                          variable has type "int")
x, y = n
if int():
    x = y  # E: Incompatible types in assignment (expression has type "str", variable has type "int")
[builtins fixtures/tuple.pyi]


[case testNamedTupleConstructorArgumentTypes]
from typing import NamedTuple
N = NamedTuple('N', [('a', int),
                     ('b', str)])
n = N('x', 'x') # E: Argument 1 to "N" has incompatible type "str"; expected "int"
n = N(1, b=2)   # E: Argument "b" to "N" has incompatible type "int"; expected "str"
N(1, 'x')
N(b='x', a=1)
[builtins fixtures/tuple.pyi]

[case testNamedTupleAsBaseClass]
from typing import NamedTuple
N = NamedTuple('N', [('a', int),
                     ('b', str)])
class X(N):
    pass
x = X(1, 2)  # E: Argument 2 to "X" has incompatible type "int"; expected "str"
s = ''
i = 0
if int():
    s = x.a  # E: Incompatible types in assignment (expression has type "int", variable has type "str")
if int():
    i, s = x
if int():
    s, s = x # E: Incompatible types in assignment (expression has type "int", variable has type "str")
[builtins fixtures/tuple.pyi]

[case testNamedTupleAsBaseClass2]
from typing import NamedTuple
class X(NamedTuple('N', [('a', int),
                         ('b', str)])):
    pass
x = X(1, 2)  # E: Argument 2 to "X" has incompatible type "int"; expected "str"
s = ''
i = 0
if int():
    s = x.a  # E: Incompatible types in assignment (expression has type "int", variable has type "str")
if int():
    i, s = x
if int():
    s, s = x # E: Incompatible types in assignment (expression has type "int", variable has type "str")
[builtins fixtures/tuple.pyi]


[case testNamedTuplesTwoAsBaseClasses]
from typing import NamedTuple
A = NamedTuple('A', [('a', int)])
B = NamedTuple('B', [('a', int)])
class X(A, B):  # E: Class has two incompatible bases derived from tuple
    pass
[builtins fixtures/tuple.pyi]


[case testNamedTuplesTwoAsBaseClasses2]
from typing import NamedTuple
A = NamedTuple('A', [('a', int)])
class X(A, NamedTuple('B', [('a', int)])): # E: Class has two incompatible bases derived from tuple
    pass
[builtins fixtures/tuple.pyi]


[case testNamedTupleSelfTypeWithNamedTupleAsBase]
from typing import NamedTuple
A = NamedTuple('A', [('a', int), ('b', str)])
class B(A):
    def f(self, x: int) -> None:
        self.f(self.a)
        self.f(self.b)  # E: Argument 1 to "f" of "B" has incompatible type "str"; expected "int"
        i = 0
        s = ''
        if int():
            i, s = self
            i, i = self  # E: Incompatible types in assignment (expression has type "str", \
                              variable has type "int")
[builtins fixtures/tuple.pyi]


[out]

[case testNamedTupleTypeReferenceToClassDerivedFrom]
from typing import NamedTuple
A = NamedTuple('A', [('a', int), ('b', str)])
class B(A):
    def f(self, x: 'B') -> None:
        i = 0
        s = ''
        if int():
            self = x
            i, s = x
            i, s = x.a, x.b
            i, s = x.a, x.a  # E: Incompatible types in assignment (expression has type "int", \
                                  variable has type "str")
            i, i = self  # E: Incompatible types in assignment (expression has type "str", \
                              variable has type "int")
[builtins fixtures/tuple.pyi]

[out]

[case testNamedTupleSubtyping]
from typing import NamedTuple, Tuple
A = NamedTuple('A', [('a', int), ('b', str)])
class B(A): pass
a = A(1, '')
b = B(1, '')
t = None  # type: Tuple[int, str]
if int():
    b = a  # E: Incompatible types in assignment (expression has type "A", variable has type "B")
if int():
    a = t  # E: Incompatible types in assignment (expression has type "Tuple[int, str]", variable has type "A")
if int():
    b = t  # E: Incompatible types in assignment (expression has type "Tuple[int, str]", variable has type "B")
if int():
    t = a
if int():
    t = (1, '')
if int():
    t = b
if int():
    a = b
[builtins fixtures/tuple.pyi]


[case testNamedTupleSimpleTypeInference]
from typing import NamedTuple, Tuple
A = NamedTuple('A', [('a', int)])
l = [A(1), A(2)]
a = A(1)
if int():
    a = l[0]
(i,) = l[0]
if int():
    i, i = l[0]  # E: Need more than 1 value to unpack (2 expected)
if int():
    l = [A(1)]
if int():
    a = (1,)  # E: Incompatible types in assignment (expression has type "Tuple[int]", \
                   variable has type "A")
[builtins fixtures/list.pyi]

[case testNamedTupleMissingClassAttribute]
import collections
MyNamedTuple = collections.namedtuple('MyNamedTuple', ['spam', 'eggs'])
MyNamedTuple.x # E: "Type[MyNamedTuple]" has no attribute "x"

[builtins fixtures/list.pyi]

[case testNamedTupleEmptyItems]
from typing import NamedTuple
A = NamedTuple('A', [])
[builtins fixtures/tuple.pyi]


[case testNamedTupleProperty]
from typing import NamedTuple
A = NamedTuple('A', [('a', int)])
class B(A):
    @property
    def b(self) -> int:
        return self.a
class C(B): pass
B(1).b
C(2).b

[builtins fixtures/property.pyi]

[case testNamedTupleAsDict]
from collections import namedtuple

X = namedtuple('X', ['x', 'y'])
x = None  # type: X
reveal_type(x._asdict())  # N: Revealed type is "builtins.dict[builtins.str, Any]"

[builtins fixtures/dict.pyi]

[case testNamedTupleReplace]
from collections import namedtuple

X = namedtuple('X', ['x', 'y'])
x = None  # type: X
reveal_type(x._replace())  # N: Revealed type is "Tuple[Any, Any, fallback=__main__.X]"
x._replace(y=5)
x._replace(x=3)
x._replace(x=3, y=5)
x._replace(z=5)  # E: Unexpected keyword argument "z" for "_replace" of "X"
x._replace(5)  # E: Too many positional arguments for "_replace" of "X"

[builtins fixtures/list.pyi]

[case testNamedTupleReplaceAsClass]
# flags: --no-strict-optional
from collections import namedtuple

X = namedtuple('X', ['x', 'y'])
x = None  # type: X
X._replace(x, x=1, y=2)
X._replace(x=1, y=2)  # E: Missing positional argument "_self" in call to "_replace" of "X"

[builtins fixtures/list.pyi]

[case testNamedTupleReplaceTyped]
from typing import NamedTuple

X = NamedTuple('X', [('x', int), ('y', str)])
x = None  # type: X
reveal_type(x._replace())  # N: Revealed type is "Tuple[builtins.int, builtins.str, fallback=__main__.X]"
x._replace(x=5)
x._replace(y=5)  # E: Argument "y" to "_replace" of "X" has incompatible type "int"; expected "str"
[builtins fixtures/tuple.pyi]

[case testNamedTupleMake]
from typing import NamedTuple

X = NamedTuple('X', [('x', int), ('y', str)])
reveal_type(X._make([5, 'a']))  # N: Revealed type is "Tuple[builtins.int, builtins.str, fallback=__main__.X]"
X._make('a b')  # E: Argument 1 to "_make" of "X" has incompatible type "str"; expected "Iterable[Any]"

-- # FIX: not a proper class method
-- x = None  # type: X
-- reveal_type(x._make([5, 'a']))  # N: Revealed type is "Tuple[builtins.int, builtins.str, fallback=__main__.X]"
-- x._make('a b')  # E: Argument 1 to "_make" of "X" has incompatible type "str"; expected Iterable[Any]

[builtins fixtures/list.pyi]

[case testNamedTupleFields]
from typing import NamedTuple

X = NamedTuple('X', [('x', int), ('y', str)])
reveal_type(X._fields)  # N: Revealed type is "Tuple[builtins.str, builtins.str]"
[builtins fixtures/tuple.pyi]

[case testNamedTupleSource]
from typing import NamedTuple

X = NamedTuple('X', [('x', int), ('y', str)])
reveal_type(X._source)  # N: Revealed type is "builtins.str"
x = None  # type: X
reveal_type(x._source)  # N: Revealed type is "builtins.str"
[builtins fixtures/tuple.pyi]

[case testNamedTupleUnit]
from typing import NamedTuple

X = NamedTuple('X', [])
x = X()  # type: X
x._replace()
x._fields[0]  # E: Tuple index out of range
[builtins fixtures/tuple.pyi]

[case testNamedTupleJoinNamedTuple]
from typing import NamedTuple

X = NamedTuple('X', [('x', int), ('y', str)])
Y = NamedTuple('Y', [('x', int), ('y', str)])
reveal_type([X(3, 'b'), Y(1, 'a')])  # N: Revealed type is "builtins.list[Tuple[builtins.int, builtins.str]]"

[builtins fixtures/list.pyi]

[case testNamedTupleJoinTuple]
from typing import NamedTuple, Tuple

X = NamedTuple('X', [('x', int), ('y', str)])
reveal_type([(3, 'b'), X(1, 'a')])  # N: Revealed type is "builtins.list[Tuple[builtins.int, builtins.str]]"
reveal_type([X(1, 'a'), (3, 'b')])  # N: Revealed type is "builtins.list[Tuple[builtins.int, builtins.str]]"

[builtins fixtures/list.pyi]

[case testNamedTupleFieldTypes]
from typing import NamedTuple

X = NamedTuple('X', [('x', int), ('y', str)])
reveal_type(X._field_types)  # N: Revealed type is "builtins.dict[builtins.str, Any]"
x = None  # type: X
reveal_type(x._field_types)  # N: Revealed type is "builtins.dict[builtins.str, Any]"

[builtins fixtures/dict.pyi]

[case testNamedTupleAndOtherSuperclass]
from typing import NamedTuple

class A: pass
def f(x: A) -> None: pass

class B(NamedTuple('B', []), A): pass
f(B())
x = None  # type: A
if int():
    x = B()

# Sanity check: fail if baseclass does not match
class C: pass
def g(x: C) -> None: pass
class D(NamedTuple('D', []), A): pass

g(D())  # E: Argument 1 to "g" has incompatible type "D"; expected "C"
y = None  # type: C
if int():
    y = D()  # E: Incompatible types in assignment (expression has type "D", variable has type "C")
[builtins fixtures/tuple.pyi]

[case testNamedTupleSelfTypeMethod]
from typing import TypeVar, NamedTuple

T = TypeVar('T', bound='A')

class A(NamedTuple('A', [('x', str)])):
    def member(self: T) -> T:
        return self

class B(A):
    pass

a = None  # type: A
a = A('').member()
b = None  # type: B
b = B('').member()
a = B('')
a = B('').member()
[builtins fixtures/tuple.pyi]

[case testNamedTupleSelfTypeReplace]
from typing import NamedTuple, TypeVar
A = NamedTuple('A', [('x', str)])
reveal_type(A('hello')._replace(x=''))  # N: Revealed type is "Tuple[builtins.str, fallback=__main__.A]"
a = None  # type: A
a = A('hello')._replace(x='')

class B(A):
    pass

reveal_type(B('hello')._replace(x=''))  # N: Revealed type is "Tuple[builtins.str, fallback=__main__.B]"
b = None  # type: B
b = B('hello')._replace(x='')
[builtins fixtures/tuple.pyi]

[case testNamedTupleSelfTypeMake]
from typing import NamedTuple, TypeVar
A = NamedTuple('A', [('x', str)])
reveal_type(A._make(['']))  # N: Revealed type is "Tuple[builtins.str, fallback=__main__.A]"
a = A._make([''])  # type: A

class B(A):
    pass

reveal_type(B._make(['']))  # N: Revealed type is "Tuple[builtins.str, fallback=__main__.B]"
b = B._make([''])  # type: B

[builtins fixtures/list.pyi]

[case testNamedTupleIncompatibleRedefinition]
from typing import NamedTuple
class Crash(NamedTuple):
    count: int  # E: Incompatible types in assignment (expression has type "int", base class "tuple" defined the type as "Callable[[Tuple[int, ...], object], int]")
[builtins fixtures/tuple.pyi]

[case testNamedTupleInClassNamespace]
# https://github.com/python/mypy/pull/2553#issuecomment-266474341
from typing import NamedTuple
class C:
    def f(self):
        A = NamedTuple('A', [('x', int)])
    def g(self):
        A = NamedTuple('A', [('y', int)])
C.A  # E: "Type[C]" has no attribute "A"
[builtins fixtures/tuple.pyi]

[case testNamedTupleInFunction]
from typing import NamedTuple
def f() -> None:
    A = NamedTuple('A', [('x', int)])
A  # E: Name "A" is not defined
[builtins fixtures/tuple.pyi]

[case testNamedTupleForwardAsUpperBound]
from typing import NamedTuple, TypeVar, Generic
T = TypeVar('T', bound='M')
class G(Generic[T]):
    x: T

yb: G[int] # E: Type argument "int" of "G" must be a subtype of "M"
yg: G[M]
reveal_type(G[M]().x.x)  # N: Revealed type is "builtins.int"
reveal_type(G[M]().x[0])  # N: Revealed type is "builtins.int"

M = NamedTuple('M', [('x', int)])
[builtins fixtures/tuple.pyi]
[out]

[case testNamedTupleWithImportCycle]
import a
[file a.py]
from collections import namedtuple
from b import f

N = namedtuple('N', 'a')

class X(N): pass
[file b.py]
import a

def f(x: a.X) -> None:
    reveal_type(x)
    x = a.X(1)
    reveal_type(x)
[builtins fixtures/tuple.pyi]
[out]
tmp/b.py:4: note: Revealed type is "Tuple[Any, fallback=a.X]"
tmp/b.py:6: note: Revealed type is "Tuple[Any, fallback=a.X]"

[case testNamedTupleWithImportCycle2]
import a
[file a.py]
from collections import namedtuple
from b import f

N = namedtuple('N', 'a')
[file b.py]
import a

def f(x: a.N) -> None:
    reveal_type(x)
    if int():
        x = a.N(1)
        reveal_type(x)
[builtins fixtures/tuple.pyi]
[out]
tmp/b.py:4: note: Revealed type is "Tuple[Any, fallback=a.N]"
tmp/b.py:7: note: Revealed type is "Tuple[Any, fallback=a.N]"

[case testSimpleSelfReferentialNamedTuple]

from typing import NamedTuple
class MyNamedTuple(NamedTuple):
    parent: 'MyNamedTuple' # E: Cannot resolve name "MyNamedTuple" (possible cyclic definition)

def bar(nt: MyNamedTuple) -> MyNamedTuple:
    return nt

x: MyNamedTuple
reveal_type(x.parent) # N: Revealed type is "Any"
[builtins fixtures/tuple.pyi]

-- Some crazy self-referential named tuples and types dicts
-- to be sure that everything works

[case testCrossFileNamedTupleForwardRefs]
import a
[file a.py]
import b
from typing import Any, NamedTuple

class A:
    def a(self, b: 'b.B') -> str:
        return 'a'
ATuple = NamedTuple('ATuple', [('a', Any)])

[file b.py]
import a

class B:
    def b(self, a: 'a.A') -> str:
        return 'b'
    def aWithTuple(self, atuple: 'a.ATuple') -> str:
        return 'a'
[builtins fixtures/tuple.pyi]
[out]

[case testSelfRefNT1]

from typing import Tuple, NamedTuple

Node = NamedTuple('Node', [
        ('name', str),
        ('children', Tuple['Node', ...]), # E: Cannot resolve name "Node" (possible cyclic definition)
    ])
n: Node
reveal_type(n) # N: Revealed type is "Tuple[builtins.str, builtins.tuple[Any, ...], fallback=__main__.Node]"
[builtins fixtures/tuple.pyi]

[case testSelfRefNT2]

from typing import Tuple, NamedTuple

A = NamedTuple('A', [
        ('x', str),
        ('y', Tuple['B', ...]), # E: Cannot resolve name "B" (possible cyclic definition)
    ])
class B(NamedTuple):
    x: A
    y: int

n: A
reveal_type(n) # N: Revealed type is "Tuple[builtins.str, builtins.tuple[Any, ...], fallback=__main__.A]"
[builtins fixtures/tuple.pyi]

[case testSelfRefNT3]

from typing import NamedTuple, Tuple

class B(NamedTuple):
    x: Tuple[A, int] # E: Cannot resolve name "A" (possible cyclic definition)
    y: int

A = NamedTuple('A', [
        ('x', str),
        ('y', 'B'),
    ])
n: B
m: A
reveal_type(n.x) # N: Revealed type is "Tuple[Any, builtins.int]"
reveal_type(m[0]) # N: Revealed type is "builtins.str"
lst = [m, n]
reveal_type(lst[0]) # N: Revealed type is "Tuple[builtins.object, builtins.object]"
[builtins fixtures/tuple.pyi]

[case testSelfRefNT4]

from typing import NamedTuple

class B(NamedTuple):
    x: A # E: Cannot resolve name "A" (possible cyclic definition)
    y: int

class A(NamedTuple):
    x: str
    y: B

n: A
reveal_type(n.y[0]) # N: Revealed type is "Any"
[builtins fixtures/tuple.pyi]

[case testSelfRefNT5]

from typing import NamedTuple

B = NamedTuple('B', [
        ('x', A), # E: Cannot resolve name "A" (possible cyclic definition)
        ('y', int),
    ])
A = NamedTuple('A', [
        ('x', str),
        ('y', 'B'),
    ])
n: A
def f(m: B) -> None: pass
reveal_type(n) # N: Revealed type is "Tuple[builtins.str, Tuple[Any, builtins.int, fallback=__main__.B], fallback=__main__.A]"
reveal_type(f) # N: Revealed type is "def (m: Tuple[Any, builtins.int, fallback=__main__.B])"
[builtins fixtures/tuple.pyi]

[case testRecursiveNamedTupleInBases]

from typing import List, NamedTuple, Union

Exp = Union['A', 'B']  # E: Cannot resolve name "Exp" (possible cyclic definition) \
                       # E: Cannot resolve name "A" (possible cyclic definition)
class A(NamedTuple('A', [('attr', List[Exp])])): pass
class B(NamedTuple('B', [('val', object)])): pass

def my_eval(exp: Exp) -> int:
    reveal_type(exp) # N: Revealed type is "Union[Any, Tuple[builtins.object, fallback=__main__.B]]"
    if isinstance(exp, A):
        my_eval(exp[0][0])
        return my_eval(exp.attr[0])
    if isinstance(exp, B):
        return exp.val  # E: Incompatible return value type (got "object", expected "int")
    return 0

my_eval(A([B(1), B(2)])) # OK
[builtins fixtures/isinstancelist.pyi]
[out]

[case testNamedTupleImportCycle]

import b
[file a.py]
class C:
    pass

from b import tp
x: tp
reveal_type(x.x)  # N: Revealed type is "builtins.int"

reveal_type(tp)  # N: Revealed type is "def (x: builtins.int) -> Tuple[builtins.int, fallback=b.tp]"
tp('x')  # E: Argument 1 to "tp" has incompatible type "str"; expected "int"

[file b.py]
from a import C
from typing import NamedTuple

tp = NamedTuple('tp', [('x', int)])
[builtins fixtures/tuple.pyi]
[out]

[case testSubclassOfRecursiveNamedTuple]

from typing import List, NamedTuple

class Command(NamedTuple):
    subcommands: List['Command'] # E: Cannot resolve name "Command" (possible cyclic definition)

class HelpCommand(Command):
    pass

hc = HelpCommand(subcommands=[])
reveal_type(hc)  # N: Revealed type is "Tuple[builtins.list[Any], fallback=__main__.HelpCommand]"
[builtins fixtures/list.pyi]
[out]

[case testUnsafeOverlappingNamedTuple]
from typing import NamedTuple

class Real(NamedTuple):
    def __sub__(self, other: Real) -> str: return ""
class Fraction(Real):
    def __rsub__(self, other: Real) -> Real: return other  # E: Signatures of "__rsub__" of "Fraction" and "__sub__" of "Real" are unsafely overlapping
[builtins fixtures/tuple.pyi]

[case testForwardReferenceInNamedTuple]
from typing import NamedTuple

class A(NamedTuple):
    b: 'B'
    x: int

class B:
    pass
[builtins fixtures/tuple.pyi]

[case testTypeNamedTupleClassmethod]
from typing import Type, NamedTuple
class D(NamedTuple):
    @classmethod
    def f(cls) -> None: pass

d: Type[D]
d.g()  # E: "Type[D]" has no attribute "g"
d.f()
[builtins fixtures/classmethod.pyi]

[case testTypeNamedTupleCall]

from typing import NamedTuple

Thing = NamedTuple('Thing', [('s', str), ('n', int)])

class CallableTuple(Thing):
    def __call__(self) -> None:
        pass

o = CallableTuple('hello ', 12)
o()
[builtins fixtures/tuple.pyi]

[case testNamedTupleSubclassMulti]
from typing import NamedTuple

class Base:
    pass
class BaseTuple(NamedTuple):
    value: float
class MyTuple(BaseTuple, Base):
    pass

def f(o: Base) -> None:
    if isinstance(o, MyTuple):
        reveal_type(o.value)  # N: Revealed type is "builtins.float"
[builtins fixtures/isinstance.pyi]
[out]

[case testNamedTupleNew]
from typing import NamedTuple

Base = NamedTuple('Base', [('param', int)])

class Child(Base):
    def __new__(cls, param: int = 1) -> 'Child':
        return Base.__new__(cls, param)

Base(param=10)
Child(param=10)
[builtins fixtures/tuple.pyi]

[case testNamedTupleClassMethodWithGenericReturnValue]
from typing import TypeVar, Type, NamedTuple

T = TypeVar('T', bound='Parent')

class Parent(NamedTuple):
    x: str

    @classmethod
    def class_method(cls: Type[T]) -> T:
        return cls(x='text')

class Child(Parent):
    pass

reveal_type(Child.class_method())  # N: Revealed type is "Tuple[builtins.str, fallback=__main__.Child]"
[builtins fixtures/classmethod.pyi]

[case testNamedTupleAsConditionalStrictOptionalDisabled]
# flags: --no-strict-optional
from typing import NamedTuple

class C(NamedTuple):
    a: int
    b: str

a: C
if not a:
    1()  # E: "int" not callable
b = (1, 2)
if not b:
    ''()  # E: "str" not callable
[builtins fixtures/tuple.pyi]

[case testNamedTupleDoubleForward]
from typing import Union, Mapping, NamedTuple

class MyBaseTuple(NamedTuple):
    base_field_1: int
    base_field_2: int

MyBaseTupleMapping = Mapping[MyBaseTuple, int]
MyTupleUnion = Union[MyTupleA, MyTupleB]

class MyTupleA(NamedTuple):
    field_1: MyBaseTupleMapping
    field_2: MyBaseTuple


class MyTupleB(NamedTuple):
    field_1: MyBaseTupleMapping
    field_2: MyBaseTuple

u: MyTupleUnion
reveal_type(u.field_1)  # N: Revealed type is "typing.Mapping[Tuple[builtins.int, builtins.int, fallback=__main__.MyBaseTuple], builtins.int]"
reveal_type(u.field_2)  # N: Revealed type is "Tuple[builtins.int, builtins.int, fallback=__main__.MyBaseTuple]"
reveal_type(u[0])  # N: Revealed type is "typing.Mapping[Tuple[builtins.int, builtins.int, fallback=__main__.MyBaseTuple], builtins.int]"
reveal_type(u[1])  # N: Revealed type is "Tuple[builtins.int, builtins.int, fallback=__main__.MyBaseTuple]"
[builtins fixtures/tuple.pyi]

[case testAssignNamedTupleAsAttribute]
from typing import NamedTuple

class A:
    def __init__(self) -> None:
        self.b = NamedTuple('x', [('s', str), ('n', int)])  # E: NamedTuple type as an attribute is not supported

reveal_type(A().b)  # N: Revealed type is "Any"
[builtins fixtures/tuple.pyi]

[case testNamedTupleWrongfile]
from typing import NamedTuple
from b import Type1
Type2 = NamedTuple('Type2', [('x', Type1)])
[file b.py]
from typing import NamedTuple

def foo():
    pass

Type1 = NamedTuple('Type1', [('foo', foo)])  # E: Function "b.foo" is not valid as a type  # N: Perhaps you need "Callable[...]" or a callback protocol?

[builtins fixtures/tuple.pyi]

[case testNamedTupleTypeNameMatchesVariableName]
from typing import NamedTuple
from collections import namedtuple

A = NamedTuple('X', [('a', int)])  # E: First argument to namedtuple() should be "A", not "X"
B = namedtuple('X', ['a'])         # E: First argument to namedtuple() should be "B", not "X"

C = NamedTuple('X', [('a', 'Y')])  # E: First argument to namedtuple() should be "C", not "X"
class Y: ...
[builtins fixtures/tuple.pyi]

[case testNamedTupleTypeIsASuperTypeOfOtherNamedTuples]
from typing import Tuple, NamedTuple

class Bar(NamedTuple):
    name: str = "Bar"

class Baz(NamedTuple):
    a: str
    b: str

class Biz(Baz): ...
class Other: ...
class Both1(Bar, Other): ...
class Both2(Other, Bar): ...
class Both3(Biz, Other): ...

def print_namedtuple(obj: NamedTuple) -> None:
    reveal_type(obj.name)  # N: Revealed type is "builtins.str"

b1: Bar
b2: Baz
b3: Biz
b4: Both1
b5: Both2
b6: Both3
print_namedtuple(b1)  # ok
print_namedtuple(b2)  # ok
print_namedtuple(b3)  # ok
print_namedtuple(b4)  # ok
print_namedtuple(b5)  # ok
print_namedtuple(b6)  # ok

print_namedtuple(1)  # E: Argument 1 to "print_namedtuple" has incompatible type "int"; expected "NamedTuple"
print_namedtuple(('bar',))  # E: Argument 1 to "print_namedtuple" has incompatible type "Tuple[str]"; expected "NamedTuple"
print_namedtuple((1, 2))  # E: Argument 1 to "print_namedtuple" has incompatible type "Tuple[int, int]"; expected "NamedTuple"
print_namedtuple((b1,))  # E: Argument 1 to "print_namedtuple" has incompatible type "Tuple[Bar]"; expected "NamedTuple"
t: Tuple[str, ...]
print_namedtuple(t)  # E: Argument 1 to "print_namedtuple" has incompatible type "Tuple[str, ...]"; expected "NamedTuple"

[builtins fixtures/tuple.pyi]
[typing fixtures/typing-namedtuple.pyi]

[case testNamedTupleTypeIsASuperTypeOfOtherNamedTuplesReturns]
from typing import Tuple, NamedTuple

class Bar(NamedTuple):
    n: int

class Baz(NamedTuple):
    a: str
    b: str

class Biz(Bar): ...
class Other: ...
class Both1(Bar, Other): ...
class Both2(Other, Bar): ...
class Both3(Biz, Other): ...

def good1() -> NamedTuple:
    b: Bar
    return b
def good2() -> NamedTuple:
    b: Baz
    return b
def good3() -> NamedTuple:
    b: Biz
    return b
def good4() -> NamedTuple:
    b: Both1
    return b
def good5() -> NamedTuple:
    b: Both2
    return b
def good6() -> NamedTuple:
    b: Both3
    return b

def bad1() -> NamedTuple:
    return 1  # E: Incompatible return value type (got "int", expected "NamedTuple")
def bad2() -> NamedTuple:
    return ()  # E: Incompatible return value type (got "Tuple[]", expected "NamedTuple")
def bad3() -> NamedTuple:
    return (1, 2)  # E: Incompatible return value type (got "Tuple[int, int]", expected "NamedTuple")

[builtins fixtures/tuple.pyi]
[typing fixtures/typing-namedtuple.pyi]

[case testBoolInTuplesRegression]
# https://github.com/python/mypy/issues/11701
from typing import NamedTuple, Literal, List, Tuple

C = NamedTuple("C", [("x", Literal[True, False])])

T = Tuple[Literal[True, False]]

# Was error here:
# Incompatible types in assignment (expression has type "List[C]", variable has type "List[C]")
x: List[C] = [C(True)]

t: T

# Was error here:
# Incompatible types in assignment (expression has type "List[Tuple[bool]]",
# variable has type "List[Tuple[Union[Literal[True], Literal[False]]]]")
y: List[T] = [t]
[builtins fixtures/tuple.pyi]
[typing fixtures/typing-namedtuple.pyi]

[case testNamedTupleWithBoolNarrowsToBool]
# flags: --warn-unreachable
from typing import NamedTuple

class C(NamedTuple):
    x: int

    def __bool__(self) -> bool:
        pass

def foo(c: C) -> None:
    if c:
        reveal_type(c)  # N: Revealed type is "Tuple[builtins.int, fallback=__main__.C]"
    else:
        reveal_type(c)  # N: Revealed type is "Tuple[builtins.int, fallback=__main__.C]"

def bar(c: C) -> None:
    if not c:
        reveal_type(c)  # N: Revealed type is "Tuple[builtins.int, fallback=__main__.C]"
    else:
        reveal_type(c)  # N: Revealed type is "Tuple[builtins.int, fallback=__main__.C]"

class C1(NamedTuple):
    x: int

def foo1(c: C1) -> None:
    if c:
        reveal_type(c)  # N: Revealed type is "Tuple[builtins.int, fallback=__main__.C1]"
    else:
        c  # E: Statement is unreachable

def bar1(c: C1) -> None:
    if not c:
        c  # E: Statement is unreachable
    else:
        reveal_type(c)  # N: Revealed type is "Tuple[builtins.int, fallback=__main__.C1]"
[builtins fixtures/tuple.pyi]
[typing fixtures/typing-namedtuple.pyi]

[case testInvalidNamedTupleWithinFunction]
from collections import namedtuple

def f(fields) -> None:
    TupleType = namedtuple("TupleType", fields) \
        # E: List or tuple literal expected as the second argument to "namedtuple()"
    class InheritFromTuple(TupleType):
        pass
    t: TupleType
    it: InheritFromTuple
    NT2 = namedtuple("bad", "x") # E: First argument to namedtuple() should be "NT2", not "bad"
    nt2: NT2 = NT2(x=1)
[builtins fixtures/tuple.pyi]