python - ValueError：在一个元组中解包的值太多

Question

请说明为什么要解包太多（我的 for 循环中的 ValueError）。尝试过 deb

 naislist = [('CONTROL FILE', '0', '0', '0'),
            ('REDO LOG', '0', '0', '0'),
            ('ARCHIVED LOG', '.69', '.59', '3'),
            ('BACKUP PIECE', '46.54', '0', '192'),
            ('IMAGE COPY', '0', '0', '0'),
            ('FLASHBACK LOG', '10.15', '6.31', '82'),
            ('FOREIGN ARCHIVED LOG', '0', '0', '0')]
 print "size of naislist is ",len((naislist))
 heading = ('MAIN MENU', 'LEVELS', 'LEVEL2', 'LEVEL3')

 rearrange = dict(zip((0, 1, 2, 3), (len(str(x)) for x in heading)))

 for tu, x in naislist:
     rearrange.update((i, max(rearrange[i], len(str(el))))  for i, el in enumerate(tu))
     rearrange[4] = max(rearrange[4], len(str(x)))
 forkit = '|'. join('%%-%ss' % rearrange[i] for i in xrange(0, 4))
 print '\n'.join((forkit % heading,
                  '-|-'.join(rearrange[i] * '-' for i in xrange(4)),
                  '\n'.join(forkit % (a, b, c, d) for (a, b, c), d in naislist)))

Answer 1

因为 中的每个项目有四个元素naislist，而您的循环仅指定两个变量 ( tu, x) 将它们解压缩到。