python这个程序应该怎么把二维列表创建并加入类中？

class location():
    def locateLargest(self, a: list[list]):
        maxnumber = 0
        index = (0, 0)
        for i in range(len(a)):
            _ = max(a[i])
            if _ > maxnumber:
                maxnumber = _
                index = (i, a[i].index(maxnumber))
        return maxnumber, index


a,b=eval(input())
alist=[]
for i in range(a):
    alist.append(list(eval(input().replace(' ',','))))
la=location()
maxnumber, index=la.locateLargest(alist)
print(f"最大元素{maxnumber},位于{index}")