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How to use containerItems method in fMBT

Best Python code snippet using fMBT_python

cb2_6_12_sol_1.py

Source:cb2_6_12_sol_1.py

1import copy2class ChangeCheckerMixin(object):3    containerItems = {dict: dict.iteritems, list: enumerate}4    immutable = False5    def snapshot(self):6        ''' create a snapshot of self's state -- like a shallow copy, but7            recursing over container types (not over general instances:8            instances must keep track of their own changes if needed).  '''9        if self.immutable:10            return11        self._snapshot = self._copy_container(self.__dict__)12    def makeImmutable(self):13        ''' the instance state can't change any more, set .immutable '''14        self.immutable = True15        try:16            del self._snapshot17        except AttributeError:18            pass19    def _copy_container(self, container):20        ''' semi-shallow copy, recursing on container types only '''21        new_container = copy.copy(container)22        for k, v in self.containerItems[type(new_container)](new_container):23            if type(v) in self.containerItems:24                new_container[k] = self._copy_container(v)25            elif hasattr(v, 'snapshot'):26                v.snapshot()27        return new_container28    def isChanged(self):29        ''' True if self's state is changed since the last snapshot '''30        if self.immutable:31            return False32        # remove snapshot from self.__dict__, put it back at the end33        snap = self.__dict__.pop('_snapshot', None)34        if snap is None:35            return True36        try:37            return self._checkContainer(self.__dict__, snap)38        finally:39            self._snapshot = snap40    def _checkContainer(self, container, snapshot):41        ''' return True if the container and its snapshot differ '''42        if len(container) != len(snapshot):43            return True44        for k, v in self.containerItems[type(container)](container):45            try:46                ov = snapshot[k]47            except LookupError:48                return True49            if self._checkItem(v, ov):50                return True51        return False52    def _checkItem(self, newitem, olditem):53        ''' compare newitem and olditem.  If they are containers, call54            self._checkContainer recursively.  If they're an instance with55            an 'isChanged' method, delegate to that method.  Otherwise,56            return True if the items differ. '''57        if type(newitem) != type(olditem):58            return True59        if type(newitem) in self.containerItems:60            return self._checkContainer(newitem, olditem)61        if newitem is olditem:62            method_isChanged = getattr(newitem, 'isChanged', None)63            if method_isChanged is None:64                return False65            return method_isChanged()...

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