isinstance() bug

[Michal Vitecek]

 hello,

 please consider the following situation:

 under the current directory there's a subdirectory 'package' with two
 files: __init__.py and module.py

    ./package:
        __init__.py
        module.py

 module.py contains:
 
 class A(object):
    pass

 aModule = A()


 now, let's do:

 current directory:

    >>> import package.module
    >>> type(package.module.aModule)
    <class 'package.module.A'>
    >>> isinstance(package.module.aModule, package.module.A) # so far good
    1
    >>> a = package.module.A()
    >>> isinstance(a, package.module.A) # so far good
    >>> import sys
    >>> sys.path.append('package')
    >>> import module
    >>> a = module.A()
    >>> isinstance(a, package.module.A) # will return 0 !!!
    0
    >>> isinstance(package.module.aModule, module.A) # will return 0 !!!
    0
    >>>

 how is it possible that it IS important how you imported a class
 definition for isinstance() to work? it's insane!
    
-- 
		fuf		(fuf at mageo.cz)