Python字典更新差异

否，但是您可以将dict归类为更改通知。

class ObservableDict( dict ):    def __init__( self, *args, **kw ):        self.observers= []        super( ObservableDict, self ).__init__( *args, **kw )    def observe( self, observer ):        self.observers.append( observer )    def __setitem__( self, key, value ):        for o in self.observers: o.notify( self, key, self[key], value )        super( ObservableDict, self ).__setitem__( key, value )    def update( self, anotherDict ):        for k in anotherDict: self[k]= anotherDict[k]class Watcher( object ):    def notify( self, observable, key, old, new ):        print "Change to ", observable, "at", keyw= Watcher()a= ObservableDict( {'a':'hamburger', 'b':'fries', 'c':'coke'} )a.observe( w )b = {'b':'fries', 'c':'pepsi'}a.update( b )

请注意，此处定义的超类监视程序不会检查是否存在“真实”更改；它只是指出发生了变化。