Python，nltk将相同的列表值返回到两个不同的列表？

Question

我想将文档分成两个列表，但这段代码在两个列表中都给出了相同的数据。我在这里定义了两个单独的词典。

def feature_extractor(document):
support_features = []
attack_features = []
for sentence in document:
    if (word in sentence for word in supporting_ethos):
        support_features.append(sentence)
    if (word in sentence for word in attacking_ethos):
        attack_features.append(sentence)
return(attack_features , support_features)

Answer 1

(.. for .. in ...)是generator expression。

>>> (x for x in [1,2])
<generator object <genexpr> at 0x0000000002A1B828>

当它被用作谓词时，它总是被视为真理。

>>> bool(_)
True

所以表达式(word in sentence for word in supporting_ethos)和(word in sentence for word in attacking_ethos)都被评估为真实。

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您的意思是将any用于生成器表达式吗？

if any(word in sentence for word in supporting_ethos):
    ...