def __len__(self):
    "Implements 'length' of CDF (number of zVars)\n\n        @return: number of zVars in the CDF\n        @rtype: int\n        "
    count = ctypes.c_long(0)
    self._call(const.GET_, const.CDF_NUMzVARS_, ctypes.byref(count))
    return count.value
Implements 'length' of CDF (number of zVars)

@return: number of zVars in the CDF
@rtype: int
def __len__(self):
    "Implements 'length' of CDF (number of zVars)\n\n        @return: number of zVars in the CDF\n        @rtype: int\n        "
    count = ctypes.c_long(0)
    self._call(const.GET_, const.CDF_NUMzVARS_, ctypes.byref(count))
    return count.value