Python 试着找出句子中最常见的情态动词

我有这个密码。其思想是从字符串中获取出现次数最多的情态动词。例如，如果“can”出现两次，并且出现次数超过其余部分，则函数应返回“can”，如果不存在情态动词，则应返回“none”

def check_modals(s):
    modals = ['can', 'could', 'may', 'might', 'must', 'will', "should", "would"]
    from collections import Counter
    Counter([modal for modals, modal in s])
    counts = Counter(modals)
    c = counts.most_common(1)

    return{c}

---

还是个python新手。任何帮助都将不胜感激。

当您实例化您的

计数器时，我将使用列表理解来筛选仅包括
模态中出现的单词。除此之外，你的想法是对的

def check_modals(s):
        modals = ['can', 'could', 'may', 'might', 'must', 'will', 'should', 'would']
        from collections import Counter
        counts = Counter([word for word in s if word in modals])
        if counts:
            return counts.most_common(1)[0][0]
        else:
            return ''

>>> s = 'This is a test sentence that may or may not have verbs'
>>> check_modals(s.split())
'may'

与其过滤单词，不如过滤计数：

from collections import Counter
def check_modals(s):
    counts = Counter(s)
    modals = ['can', 'could', 'may', 'might', 'must', 'will', "should", "would"]
    for key in counts.keys():
        if key not in modals:
            del counts[key]
    c = counts.most_common(1)
    return c[0][0]

print check_modals('can can'.split(' '))

印刷品：

can

我在作弊吗

def check_modals(s, modals={'can':0, 'could':0, 'may':0, 'might':0,
                            'must':0, 'will':0, "should":0, "would":0}):
    for w in s.split():
        if w in modals: modals[w]+=1
    # EDIT I will return both the most frequent and also the count number
    k, v = max(modals.iteritems(), key=lambda item:item[1])
    return (k, v) if v > 0 else (None, None)

从口译员那里

>>> s = '''I have this code. The idea is to get the most occurring modal verb from a string. For example, if 'can' appears twice, and more than the rest, the function should return 'can', and 'none' if no modal verb present.'''
>>> check_modal(s)
('should', 1)
>>> 

你好谢谢你的回复。我怎样才能让它以单词或字符串的形式返回“may”。@user3078335查看我的编辑，您只需索引
[0]
即可获取最常见的
中的第一项，然后再次
[0]
即可获取该元组的第一个元素。非常感谢！还有一件事，“.split”做什么？@user3078335是
str
类的方法，它根据指定的分隔符将字符串解析为字符串列表。因为我没有指定分隔符，所以它在空白处拆分，并生成一个单词列表。好的。这是有道理的。再次感谢。