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Revamped generic class behavior to conform to updated PEP 484 #195

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Merged
merged 9 commits into from
Apr 4, 2016
Merged

Revamped generic class behavior to conform to updated PEP 484 #195

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abefbe4
Revamp of generic classes. Dict[str, Tuple[S, T]] is now valid.
Mar 24, 2016
39324fa
Backported revamp of generic classes to Python 2.
Mar 24, 2016
31b0e00
Make flake8 happy.
Mar 24, 2016
75518b0
Remove the last _has_type_var().
Mar 24, 2016
373338d
Backport fixing the __module__ attribute of a NamedTuple.
Mar 24, 2016
44a0488
Backport test_nested().
Mar 24, 2016
5ed17e5
Merge branch 'master' into new_generic (Fix #192).
Apr 2, 2016
6a6119c
Merge branch 'master' into new_generic (backport #192).
Apr 2, 2016
e0d1c5d
Improve speed of Generic.__new__. Both PY2 and PY3. Fixes #196.
Apr 2, 2016
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114 changes: 100 additions & 14 deletions python2/test_typing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -132,6 +132,7 @@ def test_basic_constrained(self):
def test_constrained_error(self):
with self.assertRaises(TypeError):
X = TypeVar('X', int)
X

def test_union_unique(self):
X = TypeVar('X')
Expand Down Expand Up @@ -316,6 +317,7 @@ def test_union_instance_type_error(self):
def test_union_str_pattern(self):
# Shouldn't crash; see http://bugs.python.org/issue25390
A = Union[str, Pattern]
A


class TypeVarUnionTests(TestCase):
Expand Down Expand Up @@ -478,7 +480,7 @@ def get(self, key, default=None):
pass


class MySimpleMapping(SimpleMapping):
class MySimpleMapping(SimpleMapping[XK, XV]):

def __init__(self):
self.store = {}
Expand Down Expand Up @@ -533,14 +535,17 @@ def test_protocol_instance_type_error(self):
class GenericTests(TestCase):

def test_basics(self):
X = SimpleMapping[unicode, Any]
Y = SimpleMapping[XK, unicode]
X[unicode, unicode]
Y[unicode, unicode]
X = SimpleMapping[str, Any]
assert X.__parameters__ == ()
with self.assertRaises(TypeError):
X[unicode]
with self.assertRaises(TypeError):
X[int, unicode]
X[unicode, unicode]
Y = SimpleMapping[XK, unicode]
assert Y.__parameters__ == (XK,)
Y[unicode]
with self.assertRaises(TypeError):
Y[unicode, bytes]
Y[unicode, unicode]

def test_init(self):
T = TypeVar('T')
Expand All @@ -552,9 +557,33 @@ def test_init(self):

def test_repr(self):
self.assertEqual(repr(SimpleMapping),
__name__ + '.' + 'SimpleMapping[~XK, ~XV]')
__name__ + '.' + 'SimpleMapping<~XK, ~XV>')
self.assertEqual(repr(MySimpleMapping),
__name__ + '.' + 'MySimpleMapping[~XK, ~XV]')
__name__ + '.' + 'MySimpleMapping<~XK, ~XV>')

def test_chain_repr(self):
T = TypeVar('T')
S = TypeVar('S')

class C(Generic[T]):
pass

X = C[Tuple[S, T]]
assert X == C[Tuple[S, T]]
assert X != C[Tuple[T, S]]

Y = X[T, int]
assert Y == X[T, int]
assert Y != X[S, int]
assert Y != X[T, str]

Z = Y[str]
assert Z == Y[str]
assert Z != Y[int]
assert Z != Y[T]

assert str(Z).endswith(
'.C<~T>[typing.Tuple[~S, ~T]]<~S, ~T>[~T, int]<~T>[str]')

def test_dict(self):
T = TypeVar('T')
Expand Down Expand Up @@ -609,20 +638,20 @@ class C(Generic[T]):
assert C.__module__ == __name__
if not PY32:
assert C.__qualname__ == 'GenericTests.test_repr_2.<locals>.C'
assert repr(C).split('.')[-1] == 'C[~T]'
assert repr(C).split('.')[-1] == 'C<~T>'
X = C[int]
assert X.__module__ == __name__
if not PY32:
assert X.__qualname__ == 'C'
assert repr(X).split('.')[-1] == 'C[int]'
assert repr(X).split('.')[-1] == 'C<~T>[int]'

class Y(C[int]):
pass

assert Y.__module__ == __name__
if not PY32:
assert Y.__qualname__ == 'GenericTests.test_repr_2.<locals>.Y'
assert repr(Y).split('.')[-1] == 'Y[int]'
assert repr(Y).split('.')[-1] == 'Y'

def test_eq_1(self):
assert Generic == Generic
Expand Down Expand Up @@ -650,10 +679,40 @@ class A(Generic[T, VT]):
class B(Generic[KT, T]):
pass

class C(A, Generic[KT, VT], B):
class C(A[T, VT], Generic[VT, T, KT], B[KT, T]):
pass

assert C.__parameters__ == (T, VT, KT)
assert C.__parameters__ == (VT, T, KT)

def test_nested(self):

G = Generic

class Visitor(G[T]):

a = None

def set(self, a):
self.a = a

def get(self):
return self.a

def visit(self):
return self.a

V = Visitor[typing.List[int]]

class IntListVisitor(V):

def append(self, x):
self.a.append(x)

a = IntListVisitor()
a.set([])
a.append(1)
a.append(42)
assert a.get() == [1, 42]

def test_type_erasure(self):
T = TypeVar('T')
Expand All @@ -679,6 +738,24 @@ def foo(x):

foo(42)

def test_implicit_any(self):
T = TypeVar('T')

class C(Generic[T]):
pass

class D(C):
pass

assert D.__parameters__ == ()

with self.assertRaises(Exception):
D[int]
with self.assertRaises(Exception):
D[Any]
with self.assertRaises(Exception):
D[T]


class VarianceTests(TestCase):

Expand Down Expand Up @@ -988,6 +1065,15 @@ def test_basics(self):
assert Emp._fields == ('name', 'id')
assert Emp._field_types == dict(name=str, id=int)

def test_pickle(self):
global Emp # pickle wants to reference the class by name
Emp = NamedTuple('Emp', [('name', str), ('id', int)])
jane = Emp('jane', 37)
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
z = pickle.dumps(jane, proto)
jane2 = pickle.loads(z)
self.assertEqual(jane2, jane)


class IOTests(TestCase):

Expand Down
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