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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def autoBehavior(self, cascade=False):
 """ Set behavior if name is in self.parentBehavior.knownChildren. If cascade is True, unset behavior and parentBehavior for all descendants, then recalculate behavior and parentBehavior. """

        parentBehavior = self.parentBehavior
        if parentBehavior is not None:
            knownChildTup = parentBehavior.knownChildren.get(self.name, None)
            if knownChildTup is not None:
                behavior = getBehavior(self.name, knownChildTup[2])
                if behavior is not None:
                    self.setBehavior(behavior, cascade)
                    if isinstance(self, ContentLine) and self.encoded:
                        self.behavior.decode(self)
            elif isinstance(self, ContentLine):
                self.behavior = parentBehavior.defaultBehavior
                if self.encoded and self.behavior:
                    self.behavior.decode(self)