Since abc._Abstract was replaces by a new type flags the regression test suite fails. I've added a new function inspect.isabstract(). Is the mmethod fine or should I check if object is a instance of type or subclass of object, too?

1 files changed, 8 insertions, 0 deletions

diff --git a/Lib/inspect.py b/Lib/inspect.py
index 42f2c31..3f9199f 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -38,11 +38,15 @@ import dis
 import imp
 import tokenize
 import linecache
+from abc import ABCMeta
 from operator import attrgetter
 from collections import namedtuple
 from compiler.consts import (CO_OPTIMIZED, CO_NEWLOCALS, CO_VARARGS,
     CO_VARKEYWORDS, CO_GENERATOR)
 
+# See Include/object.h
+TPFLAGS_IS_ABSTRACT = 1 << 20
+
 # ----------------------------------------------------------- type-checking
 def ismodule(object):
     """Return true if the object is a module.
@@ -241,6 +245,10 @@ def isgenerator(object):
     """Return true if the object is a generator object."""
     return isinstance(object, types.GeneratorType)
 
+def isabstract(object):
+    """Return true if the object is an abstract base class (ABC)."""
+    return object.__flags__ & TPFLAGS_IS_ABSTRACT
+
 def getmembers(object, predicate=None):
     """Return all members of an object as (name, value) pairs sorted by name.
     Optionally, only return members that satisfy a given predicate."""