如何在Python中删除html文件的特定部分

Question

I am working on a html file which has item 1, item 2, and item 3. I want to delete all the text that comes after item 2. I can find item 2 in the file like this:

Item2= re.compile (r'(Item 2)',re.I|re.S)
Item2match= Item2.findall(file)

but I don't know how can I delete the text that comes after it.

Answer 1

Simply use string methods to split the html text and take the first part; str.partition() works much simpler:

file.partition('Item 2')[0]

If you wanted to keep the Item 2 text too, use:

''.join(file.partition('Item 2')[:2])

There is no need to use a regular expression here; you are matching literal text. Regular expressions is a wonderfully expressive and powerfool tool, but don't use it if there are simpler alternatives.

Demo:

>>> 'Some text with Item 2 in it'.partition('Item 2')[0]
'Some text with '
>>> ''.join('Some text with Item 2 in it'.partition('Item 2')[:2])
'Some text with Item 2'

Answer 2

>>> re.sub(r'(?s)(?<=Item&nbsp;2)(.*)', '', file)

Example:

>>> s
'Item 2...feiugeogherger\nfjweifjwef\nsfjioweiefjwe'
>>> re.sub(r'(?s)(?<=Item&nbsp;2)(.*)', '', s)
'Item&nbsp;2'