检查字典中是否存在特定的键和值 [英] Check if a specific Key and a value exist in a dictionary

问题描述

我正在尝试确定字典中是否存在特定的键和值对;但是，如果我使用contains或has-key方法，则只检查该键。我需要它来检查键和具体值。一些背景：
我们共有4个字典：一个用于A，B，CompareList和ChangeList。一旦A被初始化，我将A的内容放入CompareList（我将直接比较它们;但是A和B是双重哈希表，我已经尝试了所有这些方法，但没有一个可以为我工作）。所以一旦我们把A放在CompareList中，我将它与B中的ObjectAttributes字典进行比较，看看是否有任何改变。所以例如，B可能有键，值对形状：圆和填充：否。如果CompareList具有形状：circle和fill：是的，那么我只想填充：yes是ChangeList。问题在于if attributes.getName（）不在self.CompareList：行中。这是代码;我在Python 2.7.8上运行它。提前感谢任何帮助!!

I am trying to determine if a specific key and value pair exist in a dictionary; however, if I use the contains or has-key method, it only checks for the key. I need it to check both the key and the specific value. Some background: We have a total of 4 dictionaries: one for A, B, CompareList, and ChangeList. Once A is initialized, I put A's contents into CompareList (I would compare them directly; but A and B are double hash tables. And I've tried all of the methods here; but none of them work for me). So once we put A into CompareList, I compare it with the ObjectAttributes dictionary in B to see if anything changed. So for example, B may have the key,value pairs shape:circle and fill:no. If CompareList had shape:circle and fill:yes, then I want only fill:yes to be ChangeList. The problem lies in the "if attributes.getName() not in self.CompareList:" line. Here is the code; I am running it on Python 2.7.8. Thanks in advance for any help!!

class ObjectSemanticNetwork:
    def __init__(self):
        self.ObjectNames = {}
        self.ObjectAttributes = {}

    def setName(self, name):
        self.ObjectNames[name] = self.ObjectAttributes

    def setData(self, name, attribute):
        self.ObjectAttributes[name] = attribute

    def checkData(self, key):
        print(key)
        for key, value in self.ObjectAttributes.iteritems():
            print(key)
            print(value)
            print("\n")
class Agent:
(self):
        self.CompareList = {}
        self.ChangeListAB = {}
        self.ChangeListCD = {}

    def addToCompareList(self, name, value):
        self.CompareList[name] = value

    def addToChangeListAB(self, name, value):
        self.ChangeListAB[name] = value

    def addToChangeListCD(self, name, value):
        self.ChangeListCD[name] = value

    def CheckList(self, List, ListName):
        print '-------------------------',ListName,'--------------------------------'
        for key, value in List.iteritems():
            print(key)
            print(value)

    def Solve(self,problem):
        OSNAB = ObjectSemanticNetwork()
        for object in problem.getFigures().get("A").getObjects():
            for attributes in object.getAttributes():
                self.addToCompareList(attributes.getName(), attributes.getValue())
                OSNAB.ObjectNames["A"] = OSNAB.setData(attributes.getName(), attributes.getValue())
        #OSNAB.checkData("A")
        self.CheckList(self.CompareList,"CompareList")

        for object in problem.getFigures().get("B").getObjects():
            for attributes in object.getAttributes():
                if attributes.getName() not in self.CompareList:
                    self.addToChangeListAB(attributes.getName(), attributes.getValue())
                OSNAB.ObjectNames["B"] = OSNAB.setData(attributes.getName(), attributes.getValue())
        # OSNAB.checkData("B")
        self.CheckList(self.ChangeListAB,"ChangeList")

        OSNCD = ObjectSemanticNetwork()
        for object in problem.getFigures().get("C").getObjects():
            for attributes in object.getAttributes():
                OSNCD.ObjectNames["C"] = OSNCD.setData(attributes.getName(), attributes.getValue())
        # OSNCD.checkData("C")

        for object in problem.getFigures().get("1").getObjects():
            for attributes in object.getAttributes():
                OSNCD.ObjectNames["D"] = OSNCD.setData(attributes.getName(), attributes.getValue())
        # OSNCD.checkData("D")

        return "6"

推荐答案

这个功能如何：

def checkKeyValuePairExistence(dic, key, value):
    try:
        return dic[key] == value
    except KeyError:
        return False

如果你正在使用其他类型的字典，那么一个python提供（对不起，我不明白你的帖子，如果你使用它）然后让我知道，我会尝试给您另一种解决方案

If you are using another type of dictionary other then the one python offers (I'm sorry, I couldnt understand from your post if you are using it or not) then let me know and i'll try to give your another solution

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