python - 使用 Python 的 replace() 方法实现停用词功能

Question

我正在尝试从字符串列表中的每个元素中去除子字符串。我无法弄清楚如何处理具有多个我要删除的子字符串(停用词)的字符串。

wines = ("2008 Chardonnay", "Cabernet Sauvignon 2009", "Bordeaux 2005 Cotes du Rhone")
stop_words = ("2005", "2008", "2009", "Cotes du Rhone")
result = []

for wine in wines:
    for stop in stop_words:
        if stop in wine:
            x = wine.replace(stop, "")
            result.append(x)

print result

将 if 语句更改为 for 或 while 会返回无用信息或挂起。有什么建议吗？

Answer 1

一点点缩进和改变周围的变量会解决你的问题

for wine in wines:
    glass=wine #Lets pour your wine in a glass
    for stop in stop_words:
        if stop in glass: #Is stop in your glass? 
            #Replace stop in glass and pour it in the glass again
            glass = glass.replace(stop, "") 
    result.append(glass) #Finally pour the content from your glass to result


result
[' Chardonnay', 'Cabernet Sauvignon ', 'Bordeaux  ']

如果您喜欢冒险，可以使用正则表达式。我相信在这种情况下，正则表达式可能比简单循环更快

>>> for wine in wines:
    result.append(re.sub('('+'|'.join(stop_words)+')','',wine))    

>>> result
[' Chardonnay', 'Cabernet Sauvignon ', 'Bordeaux  ']
>>> 

或者将其作为列表理解

>>> [re.sub('('+'|'.join(stop_words)+')','',wine) for wine in wines]
[' Chardonnay', 'Cabernet Sauvignon ', 'Bordeaux  ']
>>>