On Thu, Feb 25, 2016 at 3:54 AM, ast <nom...@invalid.com> wrote:
> So we can conclude that inspect.isclass(x) is equivalent
> to isinstance(x, type)
>
> lets have a look at the source code of isclass:
>
> def isclass(object):
> """Return true if the object is a class.
>
> Class objects provide these attributes:
> __doc__ documentation string
> __module__ name of module in which this class was defined"""
> return isinstance(object, type)
Except Python 2 old-style classes (i.e. 2.x classes that aren't a
subclass of `object`) are not instances of `type`. Prior to new-style
classes, only built-in types were instances of `type`. An old-style
class is an instance of "classobj", and its instances have the
"instance" type.
>>> class A: pass
...
>>> type(A)
<type 'classobj'>
>>> type(A())
<type 'instance'>
Note that "classobj" and "instance" are instances of `type`.
The `isclass` check in Python 2 has to instead check
isinstance(object, (type, types.ClassType)).
>>> types.ClassType
<type 'classobj'>
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