拆分字符串并获取Python中的最后一个元素

拆分字符串并获取 Python 中的最后一个元素

Split a string and get the last element in Python

使用设置为的str.rsplit()方法拆分字符串并获取最后一个元素。该方法从右侧拆分，当设置为时只会执行一次拆分。maxsplit1rsplit()maxsplit1

my_str = 'one,two,three,four'

last = my_str.rsplit(',', 1)[-1]

print(last)  # 👉️ 'four'

我们使用了rsplit()从右边拆分字符串的方法。

str.rsplit
方法使用提供的分隔符作为分隔符字符串返回字符串中的单词列表。

my_str = 'one two three'

print(my_str.rsplit(' '))  # 👉️ ['one', 'two', 'three']
print(my_str.rsplit(' ', 1))  # 👉️ ['one two', 'three']

该方法采用以下 2 个参数：

Except for splitting from the right, rsplit() behaves like split().

When the maxsplit argument is set to 1, at most 1 split is done.

The last step is to access the last element in the list by accessing the list
item at index -1.

my_str = 'one,two,three,four'

last = my_str.rsplit(',', 1)[-1]

print(last)  # 👉️ 'four'

You can also use the str.split() method in a similar way.

my_str = 'one-two-three-four'

last = my_str.split('-')[-1]

print(last)  # 👉️ 'four'

If your string ends with the specific separator, you might get a confusing
result.

my_str = 'one-two-three-four-'

last = my_str.rsplit('-', 1)[-1]

# 👇️ ['one-two-three-four', '']
print(my_str.rsplit('-', 1))

print(last)  # 👉️ ""

You can use the str.strip() method to remove the leading or trailing
separator.

my_str = 'one-two-three-four-'

last = my_str.strip('-').rsplit('-', 1)[-1]

print(last)  # 👉️ "four"

We used the str.strip() method to remove any leading or trailing hyphens from
the string before calling the rsplit() method.