ValueError異常：值過多於一個元組解包

Question

請穿上爲什麼我得到一個太多解壓（ValueError異常在我的for循環）。有一些輕試圖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

因爲有四個要素naislist中的每個項目，而您的循環僅指定兩個變量（tu, x）將其解壓縮到。