Python循环遍历字典：TypeError：unpack non-sequence

Question

sub = {} 
for a, b in sub:                   #<--- error occurs here
   for s in b:
       #do blah. I was told a b is a list

它给了我TypeError: unpack non-sequence

这是什么意思？

Answer 1

你在找这个吗？

for a, b in sub.iteritems():
    # Do Something.

否则

for a, b in sub:
    #...

尝试将(a, b)分配给sub中可能不是序列的密钥。