diff options
Diffstat (limited to 'pies/_utils.py')
| -rw-r--r-- | pies/_utils.py | 31 |
1 files changed, 25 insertions, 6 deletions
diff --git a/pies/_utils.py b/pies/_utils.py index f64b6b6..12a8987 100644 --- a/pies/_utils.py +++ b/pies/_utils.py @@ -19,6 +19,8 @@ CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. """ +import abc +import sys def with_metaclass(meta, *bases): @@ -53,11 +55,28 @@ def unmodified_isinstance(*bases): it allows calls against passed in built in instances to pass even if there not a subclass """ - class UnmodifiedIsInstance(type): - @classmethod - def __instancecheck__(cls, instance): - if cls.__name__ in (str(base.__name__) for base in bases): - return isinstance(instance, bases) - return type.__instancecheck__(cls, instance) + class UnmodifiedIsInstance(object): + if sys.version_info[0] == 2 and sys.version_info[1] <= 6: + + @classmethod + def __instancecheck__(cls, instance): + if cls.__name__ in (str(base.__name__) for base in bases): + return isinstance(instance, bases) + + subclass = getattr(instance, '__class__', None) + subtype = type(instance) + if subtype is abc._InstanceType: + subtype = subclass + if subtype is subclass or subclass is None: + return cls.__subclasscheck__(subtype) + return (cls.__subclasscheck__(subclass) or cls.__subclasscheck__(subtype)) + else: + @classmethod + def __instancecheck__(cls, instance): + if cls.__name__ in (str(base.__name__) for base in bases): + return isinstance(instance, bases) + + return type.__instancecheck__(cls, instance) return with_metaclass(UnmodifiedIsInstance, *bases) + |