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在 html 文件中，通常会发现人们插入情感标记。通常，它看起来像这样：

<img alt="" border="0" class="inlineimg" src="images/smilies/smile.png" title="Smile"/>

如果只有一个这样的情感img，用它的情感标题替换它们很方便。例如：

def remove_single_img_tags(data):
    p = re.compile(r'<img.*?/>')
    img = re.findall(p, data)
    emotion = img[0].split('title=')[1].split('/')[0]
    return p.sub(emotion, data) 

test1 = u'I love you.<img alt="" border="0" class="inlineimg" src="images/smilies/smile.png" title="Smile"/>.I hate bad men.'

remove_single_img_tags(test1)

但是，如果有多个img html标签形式的情感标记。这并不容易。

def remove_img_tags(data):
    p = re.compile(r'<img.*?/>')
    img = re.findall(p, data)
    emotions = ()
    for i in img:
        emotion = i.split('title=')[1].split('/')[0]
        emotions[i] = emotion
    return p.sub(emotions, data)

test2 = u'I love you<img alt="" border="0" class="inlineimg" src="images/smilies/smile.png" title="Smile"/>I hate bad men <img alt="" border="0" class="inlineimg" src="images/smilies/mad.png" title="Mad"/>'

remove_img_tags(test2)

上面的 python 脚本不起作用。TypeError: 'tuple' object does not support item assignment

4

2 回答 2

2

你的问题在这里：

emotions = ()

如果您将其更改为

emotions = []

然后改变

emotions[i] = emotion

到

emotions.append(emotion)

然后，改变

return p.sub(emotions, data)

返回 p.sub(tuple(emotions), data)

然后一切都会正常工作。

这是您更新的代码：

def remove_img_tags(data):
    p = re.compile(r'<img.*?/>')
    img = re.findall(p, data)
    emotions = []
    for i in img:
        emotion = i.split('title=')[1].split('/')[0]
        emotions.append(emotion)
    return p.sub(tuple(emotions), data)

test2 = u'I love you<img alt="" border="0" class="inlineimg" src="images/smilies/smile.png" title="Smile"/>I hate bad men <img alt="" border="0" class="inlineimg" src="images/smilies/mad.png" title="Mad"/>'

remove_img_tags(test2)

>>> x = ()
>>> x[0] = 'hello'
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'tuple' object does not support item assignment
>>> x = []
>>> x.append('hello')
>>> x
['hello']
>>>
于 2014-06-02T02:26:53.247 回答
1

来自>>> help(re.sub)：

Help on function sub in module re:

sub(pattern, repl, string, count=0, flags=0)
    Return the string obtained by replacing the leftmost
    non-overlapping occurrences of the pattern in string by the
    replacement repl.  repl can be either a string or a callable;
    if a string, backslash escapes in it are processed.  If it is
    a callable, it's passed the match object and must return
    a replacement string to be used.

您可以为替换文本提供一个可调用对象，该替换文本将匹配项作为参数并返回替换文本。

>>> p = re.compile(r'<img.*?/>')
# repeat test string 5 times as input data
>>> data = '<img alt="" border="0" class="inlineimg" src="images/smilies/smile.png" title="Smile"/>' * 5
>>> p.sub(lambda match: match.group().split('title=')[1].split('/')[0], data)
'"Smile""Smile""Smile""Smile""Smile"'

编辑这里是其他例子：

>>> test1 = u'I love you.<img alt="" border="0" class="inlineimg" src="images/smilies/smile.png" title="Smile"/>.I hate bad men.'   >>>
>>> p.sub(lambda match: match.group().split('title=')[1].split('/')[0], test1)
u'I love you."Smile".I hate bad men.'
>>> test2 = u'I love you<img alt="" border="0" class="inlineimg" src="images/smilies/smile.png" title="Smile"/>I hate bad men <img alt="" border="0" class="inlineimg" src="images/smilies/mad.png" title="Mad"/>'
>>> p.sub(lambda match: match.group().split('title=')[1].split('/')[0], test2)
u'I love you"Smile"I hate bad men "Mad"'

我还建议将标题匹配添加到您的正则表达式中，以便您可以按组索引提取它：

>>> p = re.compile(r'<img.*?title=(".*?")/>')
>>> p.sub(lambda match: match.group(1), test2)
u'I love you"Smile"I hate bad men "Mad"'
于 2014-06-02T02:47:02.963 回答