configparser.py 文件源码

def __set__(self, cls, val):
        if not self.allow_override and hasattr(self, 'val'):
            raise Exception(
                "Can't change the value of this config parameter "
                "after initialization!")
        # print "SETTING PARAM", self.fullname,(cls), val
        if self.filter:
            self.val = self.filter(val)
        else:
            self.val = val