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迭代字典:Get'NoneType'对象不是iterable错误

iteration dictionary python

0

Noah Clark · 技术社区 · 15 年前

def play_best_hand(hand, wordDict):

tempHand = hand.copy()
points = 0
for word in wordDict:
    for letter in word:
        if letter in hand:
            tempHand[letter] = tempHand[letter] - 1 
            if tempHand[letter] < 0:
                return False
            if wordDict[word] > points:
                bestWord == word
                points = wordDict[word]
return bestWord

这是我的trackback错误。第209行对应于“for word in wordDict”行

 Traceback (most recent call last):
    File "ps6.py", line 323, in <module>
    play_game(word_list)
  File "ps6.py", line 307, in play_game
    play_hand(hand.copy(), word_list)
  File "ps6.py", line 257, in play_hand
    guess = play_best_hand(hand, wordDict)
  File "ps6.py", line 209, in play_best_hand
    for word in wordDict:
TypeError: 'NoneType' object is not iterable

2 回复 | 直到 15 年前

1

4

leoluk 15 年前

这意味着变量 wordDict None 而不是字典。这意味着调用 play_best_hand return 没有 ?

2

sth 15 年前

在 play_best_hand() 您拥有的功能:

if wordDict[word] > points:
    bestWord == word

你可能是想做一个作业,而不是进行平等比较:

if wordDict[word] > points:
    bestWord = word