def test_dynamic_attributes():
from pybind11_tests import DynamicClass, CppDerivedDynamicClass
instance = DynamicClass()
if hasattr(instance, "foo"):
raise AssertionError
if "foo" in dir(instance):
raise AssertionError
# Dynamically add attribute
instance.foo = 42
if not hasattr(instance, "foo"):
raise AssertionError
if instance.foo != 42:
raise AssertionError
if "foo" not in dir(instance):
raise AssertionError
# __dict__ should be accessible and replaceable
if "foo" not in instance.__dict__:
raise AssertionError
instance.__dict__ = {"bar": True}
if hasattr(instance, "foo"):
raise AssertionError
if not hasattr(instance, "bar"):
raise AssertionError
with pytest.raises(TypeError) as excinfo:
instance.__dict__ = []
if str(excinfo.value
) != "__dict__ must be set to a dictionary, not a 'list'":
raise AssertionError
cstats = ConstructorStats.get(DynamicClass)
if cstats.alive() != 1:
raise AssertionError
del instance
if cstats.alive() != 0:
raise AssertionError
# Derived classes should work as well
class PythonDerivedDynamicClass(DynamicClass):
pass
for cls in CppDerivedDynamicClass, PythonDerivedDynamicClass:
derived = cls()
derived.foobar = 100
if derived.foobar != 100:
raise AssertionError
if cstats.alive() != 1:
raise AssertionError
del derived
if cstats.alive() != 0:
raise AssertionError
def test_dynamic_attributes():
from pybind11_tests import DynamicClass, CppDerivedDynamicClass
instance = DynamicClass()
assert not hasattr(instance, "foo")
assert "foo" not in dir(instance)
# Dynamically add attribute
instance.foo = 42
assert hasattr(instance, "foo")
assert instance.foo == 42
assert "foo" in dir(instance)
# __dict__ should be accessible and replaceable
assert "foo" in instance.__dict__
instance.__dict__ = {"bar": True}
assert not hasattr(instance, "foo")
assert hasattr(instance, "bar")
with pytest.raises(TypeError) as excinfo:
instance.__dict__ = []
assert str(
excinfo.value) == "__dict__ must be set to a dictionary, not a 'list'"
cstats = ConstructorStats.get(DynamicClass)
assert cstats.alive() == 1
del instance
assert cstats.alive() == 0
# Derived classes should work as well
class PythonDerivedDynamicClass(DynamicClass):
pass
for cls in CppDerivedDynamicClass, PythonDerivedDynamicClass:
derived = cls()
derived.foobar = 100
assert derived.foobar == 100
assert cstats.alive() == 1
del derived
assert cstats.alive() == 0
def test_dynamic_attributes():
from pybind11_tests import DynamicClass, CppDerivedDynamicClass
instance = DynamicClass()
assert not hasattr(instance, "foo")
assert "foo" not in dir(instance)
# Dynamically add attribute
instance.foo = 42
assert hasattr(instance, "foo")
assert instance.foo == 42
assert "foo" in dir(instance)
# __dict__ should be accessible and replaceable
assert "foo" in instance.__dict__
instance.__dict__ = {"bar": True}
assert not hasattr(instance, "foo")
assert hasattr(instance, "bar")
with pytest.raises(TypeError) as excinfo:
instance.__dict__ = []
assert str(excinfo.value) == "__dict__ must be set to a dictionary, not a 'list'"
cstats = ConstructorStats.get(DynamicClass)
assert cstats.alive() == 1
del instance
assert cstats.alive() == 0
# Derived classes should work as well
class PythonDerivedDynamicClass(DynamicClass):
pass
for cls in CppDerivedDynamicClass, PythonDerivedDynamicClass:
derived = cls()
derived.foobar = 100
assert derived.foobar == 100
assert cstats.alive() == 1
del derived
assert cstats.alive() == 0