Python的循環通過字典：類型錯誤：解壓縮非序列

Question

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

，這讓我TypeError: unpack non-sequence

這是什麼意思？

Answer 1

您是否正在尋找？

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

否則

for a, b in sub: 
    #... 

嘗試分配(a, b)在sub一個鍵，其可能不是一個序列。