python一个语句的意思

ToughGuy630

# 转换为str
def known(words):
    return set(str(w) for w in words if w in NWORDS)

set 在这里的作用就是取得一个没有重复的集合.

至于写清楚点

def known(words):
    l = []
    for w in words:
        if w in NWORDS and w not in l:
            l.append(str(w))
    return l

或者用set

def known(words):
    l = []
    for w in words:
        if w in NWORDS:
            l.append(str(w))
    # l = [str(w) for w in words if w in NWORDS]
    # l = (str(w) for w in words if w in NWORDS)
    return set(l)