Python xml.etree.ElementTree 模块，VERSION 实例源码

def is_available(cls):
        # Is vital piece of ElementTree module available at all?
        try:
            cls.ET.Element
        except:
            return False
        # We only support ElementTree version 1.3+
        from distutils.version import StrictVersion
        return StrictVersion(BaseET.VERSION) >= StrictVersion('1.3')

def is_available(cls):
        if not super(cElementTreeAdapter, cls).is_available():
            return False
        # We only support cElementTree version 1.0.6+
        from distutils.version import StrictVersion
        return StrictVersion(cls.ET.VERSION) >= StrictVersion('1.0.6')