返回二维数组中的列数/最长行数并删除

Question

我正在做一个任务，试图在python3中设计两种抽象数据类型。我的问题是关于子类“dnmMtx”的，我正在寻找关于返回这个子类“size”函数中的列数和最长行数的指导，并试图找出如何删除一行。起初我以为我可以弹出一行或使用.delete选项，但都没有成功。另外，当前我的size函数返回有多少行。非常感谢您的帮助！你知道吗

class DnmArr:

    def __init__(self):

        #create empty list
        self.arr=[]

    def __del__(self):
        print('Deconstructed')

    #return length
    def length(self):
        return len(self.arr)

    #append
    def append(self, x):
        #add x to arr
        if type(x) == int:
            self.arr.append(x)
        else:
            print('Not an integer.')

    #delete
    def delete(self,x):
        index = x
        #if element is present in array
        if index <= len(self.arr):
            self.arr.pop(index)
        else:
            print('Element does not exist.')


    def value(self, x):        
        if x <= len(self.arr) and type(x) == int:
            print(self.arr[x-1])
        else:
            print('Does not exist or list indices is not an integer')




#initializing subclass using parent
class DnmMtx(DnmArr):

    def __init__(self):
        DnmArr.__init__(self)
        self.arr=[[],[]] #creating 2d array

    def __del__(self):
        print('Deconstructed')

    def addrow(self):
        row = []
        self.arr.append(row)

    def delrow(self, x):
        if type(x) == int:
            self.arr.delete(arr[x])
        else:
            print('row does not exist/invalid row')

    def size(self):
         return len(self.arr)

    def append(self, x, y):
        if type(x) and type(y) == int:
            self.arr[x].append(y)
        else:
            print('Not an integer.')

    def delete(self, x, y):
        #if element is present
        if y <= len(self.arr[x]) and x <= len(self.arr): #check 
            self.arr[x].pop(y)
        else:
            print('Element does not exist.')

    def value(self, x, y):
        if x and y <= len(self.arr) and type(x) and type(y) == int:
            print(self.arr[x-1][y-1])
        else:
            print('Does not exist or list indices is not an integer')



#create object of type Dynamic Array
a = DnmArr()

b = DnmMtx()

Answer 1

您的self.arr.pop(index)调用也应该适用于行。list不知道它的元素也是列表。你知道吗

也可以通过执行以下操作删除列表列表中的行

del self.arr[row_index]

例如

arr = [[1,2,3], [4,5,6]]
del arr[0]
print(arr) #  > [[4, 5, 6]]