试图获得对角线总和

Question

试图在#6创建的列表的#7中对角地获得总和.所以说清单是这个[[2,3,1],[1,1,1],[5,6,4]]总和将是2 + 1 + 4

#6

def randomlists(s):
    b=s
    list1 = []
    while s>0:
        sublist = []
        for x in range(0,b):
            sublist.append(randrange(-100,101))
        list1.append(sublist)
        s-=1
    return list1
#print(randomlists(5))
#7

def diagonalsum(x):
    a=randomlists(x)
    count=0
    print (a)
    for b in a:
        while count<x:
            d=a[0]
            b=a[1]
            c=a[2]
            print (a[(count)])
            count+=1
        return d+b+c
print (diagonalsum(3))

Answer 1

假设矩阵是方形的,这是使用循环的标准解决方案:

def diagonalsum(m):
  count = 0
  for i in xrange(0, len(m)):
    count += m[i][i]
  return count

...通过使用生成器表达式和sum函数,可以更简洁的方式编写:

def diagonalsum(m):
    return sum(m[i][i] for i in xrange(len(m)))