Python - 如何从长字符串列表中删除特定的第一个单词

Question

I have a list as shown below. I want to remove the first word which will always be 'Value' from my list of strings. I am able to do this by indexing (code below) but is there any way to do this by identifying the actual phrase 'Value'?

Example list

my_lst=['Value today is great weather.','Value final dataset.','Value for money.']

new_lst=[]
for i in my_lst:
    new_lst.append(i[6:])

Answer 1

You want to remove a prefix, so...

>>> 'Value foo bar'.removeprefix('Value ')
'foo bar'

Answer 2

A generic way to remove prefix words could be done as:

target_word = "Value"
if mystring.startswith(target_word):
    mystring = mystring[len(target_word):]

You can loop this and rename your variables as required.

Answer 3

Like this?

my_lst=['Value today is great weather.','Value final dataset.','Value for money.']

new_lst=[]
for i in my_lst:
    if i[0:5]=="Value":
        new_lst.append(i[6:])
print(new_lst)

Answer 4

Consider using regular expression substitution:

new_lst = [re.sub('^Value\s+', '', w) for w in my_lst]
#['today is great weather.', 'final dataset.', 'for money.']

Explanation: "^Value\s+" is the word "Value" at the beginning of a string ( "^" ), followed by one or more ( "+" ) spaces ( "\s" ).

Answer 5

You can use list comprehension with str.startswith() as:

my_lst = ['Value today is great weather.', 'Value final dataset.', 'Value for money.']
my_word = 'Value'

new_list = [s[len(my_word):] for s in my_lst if s.startswith(my_word)]
# where `new_list` will give you list as:
#    [' today is great weather.', ' final dataset.', ' for money.']

If you are on Python 3.9+ , you can use str.removeprefix (skipping str.startswith check) as:

my_lst = ['Value today is great weather.', 'Value final dataset.', 'Value for money.']
my_word = 'Value'

new_list = [s.removeprefix(my_word) for s in my_lst]
# [' today is great weather.', ' final dataset.', ' for money.']

Answer 6

what about this one:

new_list = [word.split('Value ')[-1] for word in mylst]

Answer 7

You can removeprefix like this (only for Python >3.9):

>>> my_lst = ['Value today is great weather.', 'Value final dataset.', 'Value for money.']
>>> phrase = 'Value '
>>> [x.removeprefix(phrase) for x in my_lst]
['today is great weather.', 'final dataset.', 'for money.']

Answer 8

You may use:

new_lst = " ".join(my_lst.split()[1:])

It will remove the first world of a sentence.

Answer 9

use regular expression sub and look for Value at the start of the sentence

my_list=['Value today is great weather.','Value final dataset.','Value for money.']

for i in range(len(my_list)):
    my_list[i]=re.sub('^Value ','',my_list[i])

print(my_list)

output:

['today is great weather.', 'final dataset.', 'for money.']

Answer 10

You can use:

my_lst.replace("value", "")

"Replace" is used to replace one specific word with another word.