Python：如何删除以特定单词开头的句子

Question

I am trying to remove whole sentences that start with a certain phrase, but I want to retain the rest of the body text. For example:

text = "Hello I like dogs. I also like cats. Hello I like animals"

I want to remove any sentence that starts with "Hello" But retain the rest, therefore the function should only leave:

"I also like cats."

Currently I am experimenting with regex expressions, but I am unsure of a way to achieve this. Any help would be appreciated.

Answer 1

Here is a basic approach. You may need to use something more fancy in order to split the sentences; see this post for more details.

>>> text = "Hello I like dogs. I also like cats. Hello I like animals"
>>> sentences = text.split(". ")
>>> ". ".join(s for s in sentences if not s.lower().startswith("hello")) + "."
'I also like cats.'

Answer 2

read the code notes plaese:

text = "Hello I like dogs. I also like cats. Hello I like animals"
#get list of sentences, split by the DOT and space ". "
#like: ['Hello I like dogs', 'I also like cats', 'Hello I like animals']
t = text.split('. ')
#now lets loop for each value on our list
for v in t:
    #check if the first 5 letters are "Hello"
    if v[0:5] == 'Hello':
        #if it is - remove the value from the list.
        t.remove(v)
#now we have list of filtered strings:
#t

notice that the word 'Hello' may UPPER/LOWER case, so if you want to cover it all, add at the if:

if v[0:5].casefold() == 'hello':

It refers to the string as lowercase.