Check if a symlink is broken or circular

[Giampaolo Rodola']

Hi there,
I would like to know if such function would be correct for verifying
if a link is broken and/or circular.

def isvalidlink(path):
    assert os.path.islink(path)
    try:
        os.stat(path)
    except os.error:
        return 1
    return 0
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