如何从Python的文本中提取A到L字母开头的单词？

Question

语言：Python

因此，我在不使用外部库的情况下从文本中提取命名实体。 然后我想创建两个列表，一个用于以 AL 开头的名称； 另一个以 MZ 开头的名称。 我写了这段代码，但它没有返回任何 output。有人看到这里出了什么问题吗？ 请注意，我是一般编码的初学者，可能不熟悉这些术语。

AL = []
MZ = []
for match in matches:
    if ((match[0] >= "A") and (match[0] <= "L")):
        AL.append(match)
        print("Words between A-L are:  ", AL)
    elif ((match[0] >= "M" and match[0] <= "Z")):
        MZ.append(match)
        print("Words between M-Z are: ", MZ)

编辑：

有人问我“比赛”来自什么：

pattern = re.compile(r'\.?\s\b[A-Z][a-z]\w+')
matches = pattern.findall(text) 


# print(matches)

这是 output 列表，我试图在其中对 AL 和 MZ 之间的名称进行排序：

matches = ['Rossini', 'William Tell', 'America', 'Athabaskan', 'Mackenzie River', 'Morse', 'Trappist', 'Plains', 'India']

我所说的“它不起作用”的意思是它返回空括号。

Names between A and L:  []
Names between M and Z:  []

谢谢大家的贡献。

Answer 1

所以看下面的例子：

def filter_words(words):
    AL = []
    MZ = []
    unclassified = []
    for word in words:
        if ((word[0] >= "A") and (word[0] <= "L")):
            AL.append(word)
        elif ((word[0] >= "M" and word[0] <= "Z")):
            MZ.append(word)
        else:
            unclassified.append(word)
    return AL, MZ, unclassified
    

AL, MZ, unclassified = filter_words(["Al", "Bob", "Todd", "Zack", "todd", "zack"])

print(AL)
print(MZ)
print(unclassified)

OUTPUT

['Al', 'Bob']
['Todd', 'Zack']
['todd', 'zack']

根据您的要求，您可能希望在处理 if 语句之前调用word.upper()给定 - 如您所见 - 如果名称以小写开头将是未分类的

Answer 2

我想您可能遇到的主要问题是您正在检查大写值，如果 match[0] 是小写，它将不起作用

此外，您在每次迭代时都在打印，您应该等待整个循环运行然后打印。 这里

AL= []
MZ = []
for match in matches:
    if ((match[0].lower() >= "a") and (match[0].lower() <= "l")):
        AL.append(match)

    elif ((match[0].lower() >= "m" and match[0].lower() <= "z")):
        MZ.append(match)
        
print("Words between A-L are:  ", AL)
print("Words between M-Z are: ", MZ)

如果这仍然不起作用，请也分享匹配 object。 此外，当这两个语句都不正确时，您的代码也不会考虑情况。

Answer 3

在这里，您必须注意单词大小写：

matches = ['Arbre', 'Amie', 'Maison', 'Ligne', 'Zebre', 'Maths']

AL = []
MZ = []
for match in matches:
    match = match.upper()
    if ((match[0] >= "A") and (match[0] <= "L")):
        AL.append(match)
    elif ((match[0] >= "M" and match[0] <= "Z")):
        MZ.append(match)
        
print("Words between A-L are:  ", AL)
print("Words between M-Z are: ", MZ)

output 是：

Words between A-L are:   ['ARBRE', 'AMIE', 'LIGNE']
Words between M-Z are:  ['MAISON', 'ZEBRE', 'MATHS']