def test_resolve_bases():
class A:
pass
class B:
pass
class C:
def __mro_entries__(self, bases):
if A in bases:
return ()
return (A, )
c = C()
assert types.resolve_bases(()) == ()
assert types.resolve_bases((c, )) == (A, )
assert types.resolve_bases((C, )) == (C, )
assert types.resolve_bases((A, C)) == (A, C)
assert types.resolve_bases((c, A)) == (A, )
assert types.resolve_bases((A, c)) == (A, )
x = (A, )
y = (C, )
z = (A, C)
t = (A, C, B)
for bases in [x, y, z, t]:
assert types.resolve_bases(bases) is bases
def __new__(cls, name, this_bases, d):
if sys.version_info[:2] >= (3, 7):
# This version introduced PEP 560 that requires a bit
# of extra care (we mimic what is done by __build_class__).
resolved_bases = types.resolve_bases(bases)
if resolved_bases is not bases:
d['__orig_bases__'] = bases
else:
resolved_bases = bases
return meta(name, resolved_bases, d)
def __new__(cls, name, this_bases, d):
if sys.version_info[:2] >= (3,
7): # whe check for python version
# This version introduced PEP 560 that requires a bit
# of extra care (we mimic what is done by __build_class__).
resolved_bases = types.resolve_bases(
bases) # some __build_class__ mimic already promised
if resolved_bases is not bases:
d["__orig_bases__"] = bases # update base class dictionary
else:
resolved_bases = bases # just update base class dictionary if python version less than 3.7
return meta_mix(
name, resolved_bases,
d) # return the metaclass mixing with updated class bases
def update_event(self, inp=-1):
self.set_output_val(0, types.resolve_bases(self.input(0)))
def __prepare__(*args):
return expected_ns
B = types.new_class("B", (object, ))
C = types.new_class("C", (object, ), {"metaclass": A})
meta, ns, kwds = types.prepare_class("D", (B, C), {"metaclass": type})
print(meta is A)
print(ns is expected_ns)
print(len(kwds) == 0)
prepare_class()
print(types.resolve_bases([Point, object]))
print("-------------")
print(types.FunctionType)
print(isinstance(prepare_class, types.FunctionType))
print(types.CodeType)
print(types.LambdaType)
print(types.GeneratorType)
print(types.CoroutineType) # 对象的类型，由 async def 函数创建。
print(types.AsyncGeneratorType) # asynchronous generator 迭代器对象的类型，由异步生成器函数创建。
print(types.MethodType)
print(types.BuiltinFunctionType)
print(types.BuiltinMethodType)
print(types.WrapperDescriptorType)
print(types.MethodWrapperType)
print(types.MethodDescriptorType)