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我陷入以下困境。我正在尝试使用默认值初始化一些类属性，其中默认值是可变序列类型（列表和 numpy 数组）。因为我想在每次从类外部设置属性时进行一些错误检查，所以我正在使用@property 功能。

import numpy as np
from FDTimeBase import FDTimeBase
from FDString import FDString

class FDObjNetwork(FDTimeBase):

    def __init__(self,i_mechObjs=[FDString(),FDString(101)],i_connPointMatrix=np.array([[0.5],[0.5]]),\
                 i_excPointMatrix=np.array([[0.5],[0.]])):
        self._mechObjs = i_mechObjs
        self._connPointMatrix = i_connPointMatrix
        self._excPointMatrix = i_excPointMatrix

    @property
    def mechObjs(self):
        """the mechanically vibrating objects making up the network"""
        return self._mechObjs

    @property
    def connPointMatrix(self):
        """
        the connection point matrix of the network, where each row
        denotes a separate element in the network and each column
        denotes a separate connection
        """
        return self._connPointMatrix

    @property
    def excPointMatrix(self):
        """
        the excitation point matrix, where each row denotes a
        separate element in the network and each column denotes a
        separate excitation distribution
        """
        return self._excPointMatrix

    @mechObjs.setter
    def mechObjs(self,newMechObjs):
        try:
            [obj.k for obj in newMechObjs]
        except AttributeError:
            raise AttributeError('argument mechObjs contains an invalid object')
        else:
            self._mechObjs = newMechObjs.tolist()[:]

    @connPointMatrix.setter
    def connPointMatrix(self,newConnPointMatrix):
        try:
            newConnPointMatrix[:,0]
        except TypeError:
            raise TypeError('argument connPointMatrix must be a 2D indexable object')
        else:
             self._connPointMatrix = np.asarray(newConnPointMatrix).copy()

    @excPointMatrix.setter
    def excPointMatrix(self,newExcPointMatrix):
        try:
            newExcPointMatrix[:,0]
        except TypeError:
            raise TypeError('argument excPointMatrix must be a 2D indexable object')
        else:
            self._excPointMatrix = np.asarray(newExcPointMatrix).cop()

    # public methods
    def calcModes(self):
        self.__checkDimensions()

    # private methods
    def __checkDimensions(self):
        if len(self.connPointMatrix[0,:]) != len(self.excPointMatrix[0,:]):
            raise Exception('arguments connPointMatrix and excPointMatrix must contain an equal nr. of rows')
        if len(self.connPointMatrix[0,:]) != len(self.mechObjs):
            raise Exception('the nr. of rows of argument connPointMatrix must be equal to the nr. of\
                            elements in mechObjs')
        if len(self.excPointMatrix[0,:]) != len(self.mechObjs):
            raise Exception('the nr. of rows of argument excPointMatrix must be equal to the nr. of\
                            elements in mechObjs')

现在，当我创建一个新实例并尝试访问 mechObjs 属性时，我得到一个 AttributeError 并且我不明白为什么（其他两个属性相同）。在实例上调用 dir() 我可以看到包含列表和数组对象的 _mechObjs、_connPointMatrix 和 _excPointMatrix 属性。有人可以告诉我我在这里做错了什么吗？对象 FDString 是另一个自定义类，我省略了发布，因为源文件相当大。FDTimeBase 是一个只包含 2 个常量类属性的对象（没什么花哨的）。

提前致谢

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