| @@ -31,6 +31,7 @@ |
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__author__ = ('Ka-Ping Yee ping@lfw.org', |
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'Yury Selivanov yselivanov@sprymix.com') |
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+import abc |
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import ast |
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import dis |
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import collections.abc |
| @@ -291,7 +292,27 @@ def isroutine(object): |
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def isabstract(object): |
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"""Return true if the object is an abstract base class (ABC).""" |
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-return bool(isinstance(object, type) and object.__flags__ & TPFLAGS_IS_ABSTRACT) |
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+if not isinstance(object, type): |
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+return False |
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+if object.__flags__ & TPFLAGS_IS_ABSTRACT: |
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+return True |
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+if not issubclass(type(object), abc.ABCMeta): |
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+return False |
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+if hasattr(object, '__abstractmethods__'): |
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+# It looks like ABCMeta.__new__ has finished running; |
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+# TPFLAGS_IS_ABSTRACT should have been accurate. |
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+return False |
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+# It looks like ABCMeta.__new__ has not finished running yet; we're |
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+# probably in __init_subclass__. We'll look for abstractmethods manually. |
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+for name, value in object.__dict__.items(): |
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+if getattr(value, "__isabstractmethod__", False): |
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+return True |
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+for base in object.__bases__: |
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+for name in getattr(base, "__abstractmethods__", ()): |
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+value = getattr(object, name, None) |
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+if getattr(value, "__isabstractmethod__", False): |
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+return True |
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+return False |
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def getmembers(object, predicate=None): |
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"""Return all members of an object as (name, value) pairs sorted by name. |