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#!/usr/bin/env python
"""
test dill's ability to pickle abstract base class objects
"""
import dill
import abc
from abc import ABC
import warnings
from types import FunctionType
dill.settings['recurse'] = True
class OneTwoThree(ABC):
@abc.abstractmethod
def foo(self):
"""A method"""
pass
@property
@abc.abstractmethod
def bar(self):
"""Property getter"""
pass
@bar.setter
@abc.abstractmethod
def bar(self, value):
"""Property setter"""
pass
@classmethod
@abc.abstractmethod
def cfoo(cls):
"""Class method"""
pass
@staticmethod
@abc.abstractmethod
def sfoo():
"""Static method"""
pass
class EasyAsAbc(OneTwoThree):
def __init__(self):
self._bar = None
def foo(self):
return "Instance Method FOO"
@property
def bar(self):
return self._bar
@bar.setter
def bar(self, value):
self._bar = value
@classmethod
def cfoo(cls):
return "Class Method CFOO"
@staticmethod
def sfoo():
return "Static Method SFOO"
def test_abc_non_local():
assert dill.copy(OneTwoThree) is not OneTwoThree
assert dill.copy(EasyAsAbc) is not EasyAsAbc
with warnings.catch_warnings():
warnings.simplefilter("ignore", dill.PicklingWarning)
assert dill.copy(OneTwoThree, byref=True) is OneTwoThree
assert dill.copy(EasyAsAbc, byref=True) is EasyAsAbc
instance = EasyAsAbc()
# Set a property that StockPickle can't preserve
instance.bar = lambda x: x**2
depickled = dill.copy(instance)
assert type(depickled) is not type(instance)
assert type(depickled.bar) is FunctionType
assert depickled.bar(3) == 9
assert depickled.sfoo() == "Static Method SFOO"
assert depickled.cfoo() == "Class Method CFOO"
assert depickled.foo() == "Instance Method FOO"
def test_abc_local():
"""
Test using locally scoped ABC class
"""
class LocalABC(ABC):
@abc.abstractmethod
def foo(self):
pass
def baz(self):
return repr(self)
labc = dill.copy(LocalABC)
assert labc is not LocalABC
assert type(labc) is type(LocalABC)
# TODO should work like it does for non local classes
# <class '__main__.LocalABC'>
# <class '__main__.test_abc_local.<locals>.LocalABC'>
class Real(labc):
def foo(self):
return "True!"
def baz(self):
return "My " + super(Real, self).baz()
real = Real()
assert real.foo() == "True!"
try:
labc()
except TypeError as e:
# Expected error
pass
else:
print('Failed to raise type error')
assert False
labc2, pik = dill.copy((labc, Real()))
assert 'Real' == type(pik).__name__
assert '.Real' in type(pik).__qualname__
assert type(pik) is not Real
assert labc2 is not LocalABC
assert labc2 is not labc
assert isinstance(pik, labc2)
assert not isinstance(pik, labc)
assert not isinstance(pik, LocalABC)
assert pik.baz() == "My " + repr(pik)
def test_meta_local_no_cache():
"""
Test calling metaclass and cache registration
"""
LocalMetaABC = abc.ABCMeta('LocalMetaABC', (), {})
class ClassyClass:
pass
class KlassyClass:
pass
LocalMetaABC.register(ClassyClass)
assert not issubclass(KlassyClass, LocalMetaABC)
assert issubclass(ClassyClass, LocalMetaABC)
res = dill.dumps((LocalMetaABC, ClassyClass, KlassyClass))
lmabc, cc, kc = dill.loads(res)
assert type(lmabc) == type(LocalMetaABC)
assert not issubclass(kc, lmabc)
assert issubclass(cc, lmabc)
if __name__ == '__main__':
test_abc_non_local()
test_abc_local()
test_meta_local_no_cache()