如何删除 Python 中字符串列表元组中特定字符之前的每个字符

Question

I have a tuple of lists of strings that looks like this

myList = ['https://wwww.example.com/watch/random-video-12'], ['https://wwww.example.com/watch/random-video-t-14'], ['https://www.example.com/watch/random-video-longest-1']

and i need to remove the last "-" character and every character before that.

Answer 1

result = []
for url in myList:
    result.append(url[0].split('-')[-1])
print(result)

Outputs :

['12', '14', '1']

Explanation :

url is a list that has a single element, url[0] . Applying split('-') on that string split the string into a list of strings that were separated with '-'.
ie: 'https://wwww.example.com/watch/random-video-12'.split('-') -> ['https://wwww.example.com/watch/random', 'video', '12'] .
Finally list[-1] gives the last element of list

Answer 2

The variable myList is not a list as its name might imply. It's actually a tuple of lists where each list contains just one element. Therefore:

myList = ['https://wwww.example.com/watch/randomvideo-12'], ['https://wwww.example.com/watch/random-video-t-14'], ['https://www.example.com/watch/random-video-longest-1']

for list_ in myList:
    for url in list_:
        if len(t := url.split('-')) > 1:
            print(t[-1])

Output:

12
14
1

Note:

The inner for loop isn't actually necessary for these data but is there to allow for extension of the lists

Answer 3

Instead of using str.split you could use str.rsplit and do it all in a comprehension:

[url[0].rsplit('-', 1)[1] for urls in myList if '-' in url[0])]

---

['12', '14', '1']