test-data/unit/check-dynamic-typing.test

-- Assignment
-- ----------


[case testAssignmentWithDynamic]
from typing import Any
d = None # type: Any
a = None # type: A

if int():
    a = d # Everything ok
if int():
    d = a
if int():
    d = d
d.x = a
d.x = d

class A: pass

[case testMultipleAssignmentWithDynamic]
from typing import Any
d = None # type: Any
a, b = None, None # type: (A, B)

if int():
    d, a = b, b    # E: Incompatible types in assignment (expression has type "B", variable has type "A")
if int():
    d, d = d, d, d # E: Too many values to unpack (2 expected, 3 provided)

if int():
    a, b = d, d
if int():
    d, d = a, b
if int():
    a, b = d
s, t = d

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


-- Expressions
-- -----------


[case testCallingFunctionWithDynamicArgumentTypes]
from typing import Any
a, b = None, None # type: (A, B)

if int():
    b = f(a) # E: Incompatible types in assignment (expression has type "A", variable has type "B")

if int():
    a = f(a)
if int():
    a = f(b)
if int():
    a = f(None)
if int():
    a = f(f)

def f(x: Any) -> 'A':
    pass

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

[case testCallingWithDynamicReturnType]
from typing import Any
a, b = None, None # type: (A, B)

a = f(b) # E: Argument 1 to "f" has incompatible type "B"; expected "A"

a = f(a)
b = f(a)

def f(x: 'A') -> Any:
    pass

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

[case testBinaryOperationsWithDynamicLeftOperand]
from typing import Any
d = None # type: Any
a = None # type: A
c = None # type: C
b = None # type: bool
n = 0

d in a  # E: Unsupported right operand type for in ("A")
d and a
d or a
if int():
    c = d and b # E: Incompatible types in assignment (expression has type "Union[Any, bool]", variable has type "C")
if int():
    c = d or b  # E: Incompatible types in assignment (expression has type "Union[Any, bool]", variable has type "C")

if int():
    c = d + a
if int():
    c = d - a
if int():
    c = d * a
if int():
    c = d / a
if int():
    c = d // a
if int():
    c = d % a
if int():
    c = d ** a
if int():
    b = d == a
if int():
    b = d != a
if int():
    b = d < a
if int():
    b = d <= a
if int():
    b = d > a
if int():
    b = d >= a
if int():
    b = d in c
if int():
    b = d and b
if int():
    b = d or b

class A: pass
class C:
    def __contains__(self, a: A) -> bool:
        pass
[file builtins.py]
class object:
  def __init__(self): pass
class bool: pass
class int: pass
class type: pass
class function: pass
class str: pass

[case testBinaryOperationsWithDynamicAsRightOperand]
from typing import Any
d = None # type: Any
a = None # type: A
c = None # type: C
b = None # type: bool
n = 0

a and d
a or d
if int():
    c = a in d  # E: Incompatible types in assignment (expression has type "bool", variable has type "C")
if int():
    c = b and d # E: Incompatible types in assignment (expression has type "Union[bool, Any]", variable has type "C")
if int():
    c = b or d  # E: Incompatible types in assignment (expression has type "Union[bool, Any]", variable has type "C")
if int():
    b = a + d
if int():
    b = a / d

if int():
    c = a + d
if int():
    c = a - d
if int():
    c = a * d
if int():
    c = a / d
if int():
    c = a // d
if int():
    c = a % d
if int():
    c = a ** d
if int():
    b = a in d
if int():
    b = b and d
if int():
    b = b or d

class A:
    def __add__(self, a: 'A') -> 'C':
        pass
    def __sub__(self, a: 'A') -> 'C':
        pass
    def __mul__(self, a: 'A') -> 'C':
        pass
    def __truediv__(self, a: 'A') -> 'C':
        pass
    def __floordiv__(self, a: 'A') -> 'C':
        pass
    def __mod__(self, a: 'A') -> 'C':
        pass
    def __pow__(self, a: 'A') -> 'C':
        pass
    def _lt(self, a: 'A') -> bool:
        pass
    def _gt(self, a: 'A') -> bool:
        pass

class C: pass
[file builtins.py]
class object:
  def __init__(self): pass
class bool: pass
class int: pass
class type: pass
class function: pass
class str: pass

[case testDynamicWithUnaryExpressions]
from typing import Any
d = None # type: Any
a = None # type: A
b = None # type: bool
if int():
    a = not d # E: Incompatible types in assignment (expression has type "bool", variable has type "A")
if int():
    b = not d
    a = -d
class A: pass
[builtins fixtures/bool.pyi]
[out]

[case testDynamicWithMemberAccess]
from typing import Any
d = None # type: Any
a = None # type: A

if int():
    a = d.foo(a()) # E: "A" not callable

if int():
    a = d.x
if int():
    a = d.foo(a, a)
d.x = a
d.x.y.z  # E: "A" has no attribute "y"

class A: pass
[out]

[case testIndexingWithDynamic]
from typing import Any
d = None # type: Any
a = None # type: A

if int():
    a = d[a()] # E: "A" not callable
d[a()] = a # E: "A" not callable

if int():
    a = d[a]
d[a] = a
d[a], d[a] = a, a

class A: pass

[case testTupleExpressionsWithDynamci]
from typing import Tuple, Any
t2 = None # type: Tuple[A, A]
d = None # type: Any

if int():
    t2 = (d, d, d)  # E: Incompatible types in assignment (expression has type "Tuple[Any, Any, Any]", variable has type "Tuple[A, A]")
if int():
    t2 = (d, d)

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

[case testCastsWithDynamicType]
from typing import Any, cast
class A: pass
class B: pass
d = None # type: Any
a = None # type: A
b = None # type: B
if int():
    b = cast(A, d) # E: Incompatible types in assignment (expression has type "A", variable has type "B")
if int():
    a = cast(A, d)
if int():
    b = cast(Any, d)
if int():
    a = cast(Any, f())
def f() -> None: pass

[case testCompatibilityOfDynamicWithOtherTypes]
from typing import Any, Tuple
d = None # type: Any
t = None # type: Tuple[A, A]
# TODO: callable types, overloaded functions

d = None # All ok
d = t
d = g
d = A
t = d
f = d

def g(a: 'A') -> None:
    pass

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


-- Statements
-- ----------


[case testDynamicCondition]
from typing import Any
d = None # type: Any
while d:
    pass
if d:
    pass
elif d:
    pass
[builtins fixtures/bool.pyi]

[case testRaiseWithDynamic]
from typing import Any
d = None # type: Any
raise d
[builtins fixtures/exception.pyi]

[case testReturnWithDynamic]
from typing import Any
d = None # type: Any

def f() -> None:
    return d # Ok

def g() -> 'A':
    return d # Ok

class A: pass


-- Implicit dynamic types for functions
-- ------------------------------------


[case testImplicitGlobalFunctionSignature]
from typing import Any, Callable
x = None # type: Any
a = None # type: A
g = None # type: Callable[[], None]
h = None # type: Callable[[A], None]

f()     # E: Missing positional argument "x" in call to "f"
f(x, x) # E: Too many arguments for "f"
if int():
    g = f   # E: Incompatible types in assignment (expression has type "Callable[[Any], Any]", variable has type "Callable[[], None]")
f(a)
f(x)
if int():
    a = f(a)
if int():
    h = f

def f(x): pass

class A: pass

[case testImplicitGlobalFunctionSignatureWithDifferentArgCounts]
from typing import Callable
g0 = None # type: Callable[[], None]
g1 = None # type: Callable[[A], None]
g2 = None # type: Callable[[A, A], None]
a = None # type: A

if int():
    g1 = f0 # E: Incompatible types in assignment (expression has type "Callable[[], Any]", variable has type "Callable[[A], None]")
if int():
    g2 = f0 # E: Incompatible types in assignment (expression has type "Callable[[], Any]", variable has type "Callable[[A, A], None]")
if int():
    g0 = f2 # E: Incompatible types in assignment (expression has type "Callable[[Any, Any], Any]", variable has type "Callable[[], None]")
if int():
    g1 = f2 # E: Incompatible types in assignment (expression has type "Callable[[Any, Any], Any]", variable has type "Callable[[A], None]")

if int():
    g0 = g0
if int():
    g2 = f2
f0()
f2(a, a)

def f0(): pass

def f2(x, y): pass

class A: pass

[case testImplicitGlobalFunctionSignatureWithDefaultArgs]
from typing import Callable
a, b = None, None # type: (A, B)

g0 = None # type: Callable[[], None]
g1 = None # type: Callable[[A], None]
g2 = None # type: Callable[[A, A], None]
g3 = None # type: Callable[[A, A, A], None]
g4 = None # type: Callable[[A, A, A, A], None]

f01(a, a)       # E: Too many arguments for "f01"
f13()           # E: Missing positional argument "x" in call to "f13"
f13(a, a, a, a) # E: Too many arguments for "f13"
if int():
    g2 = f01 # E: Incompatible types in assignment (expression has type "Callable[[Any], Any]", variable has type "Callable[[A, A], None]")
if int():
    g0 = f13 # E: Incompatible types in assignment (expression has type "Callable[[Any, Any, Any], Any]", variable has type "Callable[[], None]")
if int():
    g4 = f13 # E: Incompatible types in assignment (expression has type "Callable[[Any, Any, Any], Any]", variable has type "Callable[[A, A, A, A], None]")

f01()
f01(a)
f13(a)
f13(a, a)
f13(a, a, a)

if int():
    g0 = f01
if int():
    g1 = f01
if int():
    g1 = f13
if int():
    g2 = f13
if int():
    g3 = f13

def f01(x = b): pass
def f13(x, y = b, z = b): pass

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

[case testSkipTypeCheckingWithImplicitSignature]
a = None # type: A
def f():
    a()
def g(x):
    a()
    a.x
    a + a
    if a():
        a()
class A: pass
[builtins fixtures/bool.pyi]

[case testSkipTypeCheckingWithImplicitSignatureAndDefaultArgs]
a = None # type: A
def f(x=a()):
    a()
def g(x, y=a, z=a()):
    a()
class A: pass

[case testImplicitMethodSignature]
from typing import Callable
g0 = None # type: Callable[[], None]
g1 = None # type: Callable[[A], None]
g2 = None # type: Callable[[A, A], None]
a = None # type: A

if int():
    g0 = a.f # E: Incompatible types in assignment (expression has type "Callable[[Any], Any]", variable has type "Callable[[], None]")
if int():
    g2 = a.f # E: Incompatible types in assignment (expression has type "Callable[[Any], Any]", variable has type "Callable[[A, A], None]")
if int():
    a = a.f  # E: Incompatible types in assignment (expression has type "Callable[[Any], Any]", variable has type "A")

class A:
    def g(self) -> None:
        a = self.f(a)
    def f(self, x): pass

if int():
    g1 = a.f
if int():
    a = a.f(a)

[case testSkipTypeCheckingImplicitMethod]

a = None # type: A
class A:
    def f(self):
        a()
    def g(self, x, y=a()):
        a()

[case testImplicitInheritedMethod]
from typing import Callable
g0 = None # type: Callable[[], None]
g1 = None # type: Callable[[A], None]
a = None # type: A

if int():
    g0 = a.f # E: Incompatible types in assignment (expression has type "Callable[[Any], Any]", variable has type "Callable[[], None]")

if int():
    g1 = a.f
if int():
    a = a.f(a)

class B:
    def f(self, x):
        pass
class A(B):
    def g(self) -> None:
        a = self.f(a)

[case testEmptyReturnWithImplicitSignature]
import typing
def f():
    return
class A:
    def g(self):
        return

[case testVarArgsWithImplicitSignature]
from typing import Any
o = None # type: Any
def f(x, *a): pass
f() # E: Missing positional argument "x" in call to "f"
f(o)
f(o, o)
f(o, o, o)
[builtins fixtures/list.pyi]


-- Implicit types for constructors
-- -------------------------------


[case testInitMethodWithImplicitSignature]
from typing import Callable
f1 = None # type: Callable[[A], A]
f2 = None # type: Callable[[A, A], A]
a = None # type: A

A(a)   # E: Missing positional argument "b" in call to "A"
if int():
    f1 = A # E: Incompatible types in assignment (expression has type "Type[A]", variable has type "Callable[[A], A]")

A(a, a)
if int():
    f2 = A

class A:
  def __init__(self, a, b): pass

[case testUsingImplicitTypeObjectWithIs]

t = None # type: type
t = A
t = B

class A: pass
class B:
    def __init__(self): pass


-- Type compatibility
-- ------------------


[case testTupleTypeCompatibility]
from typing import Any, Tuple
t1 = None # type: Tuple[Any, A]
t2 = None # type: Tuple[A, Any]
t3 = None # type: Tuple[Any, Any]
t4 = None # type: Tuple[A, A]
t5 = None # type: Tuple[Any, Any, Any]

def f(): t1, t2, t3, t4, t5 # Prevent redefinition

t3 = t5 # E: Incompatible types in assignment (expression has type "Tuple[Any, Any, Any]", variable has type "Tuple[Any, Any]")
t5 = t4 # E: Incompatible types in assignment (expression has type "Tuple[A, A]", variable has type "Tuple[Any, Any, Any]")

t1 = t1
t1 = t2
t1 = t3
t1 = t4
t2 = t1
t2 = t3
t2 = t4
t3 = t1
t3 = t2
t3 = t4
t4 = t1
t4 = t2
t4 = t3

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

[case testFunctionTypeCompatibilityAndReturnTypes]
from typing import Any, Callable
f1 = None # type: Callable[[], Any]
f11 = None # type: Callable[[], Any]
f2 = None # type: Callable[[], A]
f3 = None # type: Callable[[], None]

f2 = f3

f1 = f2
f1 = f3
f2 = f11
f3 = f11

class A: pass

[case testFunctionTypeCompatibilityAndArgumentTypes]
from typing import Any, Callable
f1 = None # type: Callable[[A, Any], None]
f2 = None # type: Callable[[Any, A], None]
f3 = None # type: Callable[[A, A], None]

f1 = f1
f1 = f2
f1 = f3

f2 = f1
f2 = f2
f2 = f3

f3 = f1
f3 = f2
f3 = f3

class A: pass

[case testFunctionTypeCompatibilityAndArgumentCounts]
from typing import Any, Callable
f1 = None # type: Callable[[Any], None]
f2 = None # type: Callable[[Any, Any], None]

if int():
    f1 = f2 # E: Incompatible types in assignment (expression has type "Callable[[Any, Any], None]", variable has type "Callable[[Any], None]")


-- Overriding
-- ----------


[case testOverridingMethodWithDynamicTypes]
from typing import Any
a, b = None, None # type: (A, B)

b.f(b) # E: Argument 1 to "f" of "B" has incompatible type "B"; expected "A"
a = a.f(b)

class B:
    def f(self, x: 'A') -> 'B':
        pass
    def g(self, x: 'B') -> None:
        pass
class A(B):
    def f(self, x: Any) -> Any:
        pass
    def g(self, x: Any) -> None:
        pass
[builtins fixtures/tuple.pyi]

[case testOverridingMethodWithImplicitDynamicTypes]

a, b = None, None # type: (A, B)

b.f(b) # E: Argument 1 to "f" of "B" has incompatible type "B"; expected "A"
a = a.f(b)

class B:
    def f(self, x: 'A') -> 'B':
        pass
    def g(self, x: 'B') -> None:
        pass
class A(B):
    def f(self, x):
        pass
    def g(self, x):
        pass
[builtins fixtures/tuple.pyi]

[case testOverridingMethodAcrossHierarchy]
import typing
class C:
    def f(self, a: 'A') -> None: pass
class B(C):
    def f(self, a): pass
class A(B):
    def f(self, a: 'D') -> None: # E: Argument 1 of "f" is incompatible with supertype "C"; supertype defines the argument type as "A" \
                                 # N: This violates the Liskov substitution principle \
                                 # N: See https://mypy.readthedocs.io/en/stable/common_issues.html#incompatible-overrides
        pass
class D: pass
[out]

[case testInvalidOverrideArgumentCountWithImplicitSignature1]
import typing
class B:
    def f(self, x: A) -> None: pass
class A(B):
    def f(self, x, y): # dynamic function not type checked
        x()
[out]

[case testInvalidOverrideArgumentCountWithImplicitSignature2]
import typing
class B:
    def f(self, x, y): pass
class A(B):
    def f(self, x: 'A') -> None: # E: Signature of "f" incompatible with supertype "B"
        pass
[out]

[case testInvalidOverrideArgumentCountWithImplicitSignature3]
import typing
class B:
    def f(self, x: A) -> None: pass
class A(B):
    def f(self, x, y) -> None: # E: Signature of "f" incompatible with supertype "B"
        x()
[out]

[case testInvalidOverrideWithImplicitSignatureAndClassMethod1]
class B:
    @classmethod
    def f(cls, x, y): pass
class A(B):
    @classmethod
    def f(cls, x, y, z): pass # No error since no annotations
[builtins fixtures/classmethod.pyi]

[case testInvalidOverrideWithImplicitSignatureAndClassMethod2]
class B:
    @classmethod
    def f(cls, x: int, y): pass
class A(B):
    @classmethod
    def f(cls, x, y, z): pass # No error since no annotations
[builtins fixtures/classmethod.pyi]

[case testInvalidOverrideWithImplicitSignatureAndStaticMethod1]
class B:
    @staticmethod
    def f(x, y): pass
class A(B):
    @staticmethod
    def f(x, y, z): pass # No error since no annotations
[builtins fixtures/classmethod.pyi]

[case testInvalidOverrideWithImplicitSignatureAndStaticMethod2]
class B:
    @staticmethod
    def f(self, x: int, y): pass
class A(B):
    @staticmethod
    def f(self, x, y, z): pass # No error since no annotations
[builtins fixtures/classmethod.pyi]


-- Don't complain about too few/many arguments in dynamic functions
-- ----------------------------------------------------------------

[case testTooManyArgsInDynamic]
def f() -> None: pass
def g():
    f(1) # Silent
[out]

[case testTooFewArgsInDynamic]
def f(a: int) -> None: pass
def g():
    f() # Silent
[out]

[case testJustRightInDynamic]
def f(a: int) -> None: pass
def g():
    f('') # Silent
[out]