如何创建一个函数来打印三个向量中相同数值的个数？

def countSameValues(vector1, vector2, vector3):
    countDict = {}

    for value in vector1:
        if value in countDict:
            countDict[value] += 1
        else:
            countDict[value] = 1

    for value in vector2:
        if value in countDict:
            countDict[value] += 1
        else:
            countDict[value] = 1

    for value in vector3:
        if value in countDict:
            countDict[value] += 1
        else:
            countDict[value] = 1

    sameValuesCount = 0

    for count in countDict.values():
        if count == 3:
            sameValuesCount += 1

    print("相同数值的个数：", sameValuesCount)

# 示例使用
vector1 = [1, 2, 3, 4, 5]
vector2 = [3, 4, 5, 6, 7]
vector3 = [5, 6, 7, 8, 9]

countSameValues(vector1, vector2, vector3)