Python，nltk正在向两个不同的列表返回相同的列表值？

Question

我想将一个文档分为两个列表，但这段代码在两个列表中提供相同的数据。我定义了两个单独的字典，我也在这里使用

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，它总是被当作真理

>>> bool(_)
True

所以表达式(word in sentence for word in supporting_ethos)和(word in sentence for word in attacking_ethos)都被计算为真值

---

你的意思是将^{}与生成器表达式一起使用吗

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