如何替换字符串列表中字符串的具体子字符串？

Question

我有以下字符串列表：

list_of_str = ['Notification message', 'Warning message', 'This is the |xxx - show| message.', 'Notification message is defined by |xxx - show|', 'Notification message']

如何获取最靠近尾部且包含show|的字符串，并将show|替换为Placeholder|？

预期结果：

list_of_str = ['Notification message', 'Warning message', 'This is the |xxx - show| message.', 'Notification message is defined by |xxx - Placeholder|', 'Notification message']

Answer 1

试试这个：

idx = next((idx for idx in reversed(range(len(list_of_str)))
            if 'show|' in list_of_str[idx]), 0)
list_of_str[idx] = list_of_str[idx].replace('show|', 'Placeholder|')

您首先找到包含“show|”的最后一个索引然后你做替换。

另一个选项：

for idx in reversed(range(len(list_of_str))):
    if 'show|' in list_of_str[idx]:
        list_of_str[idx] = list_of_str[idx].replace('show|', 'Placeholder|')
        break

Answer 2

反向迭代，查找并替换：

for i, s in enumerate(reversed(list_of_str), 1):
    if 'show|' in s:
        list_of_str[-i] = s.replace('show|', 'Placeholder|')
        break

Answer 3

这应该有效

# reverse the list
for i, x in enumerate(list_of_str[::-1]):
    # replace the first instance and break loop
    if 'show|' in x:
        list_of_str[len(list_of_str)-i-1] = x.replace('show|', 'Placeholder|')
        break
list_of_str
['Notification message',
 'Warning message',
 'This is the |xxx - show| message.',
 'Notification message is defined by |xxx - Placeholder|',
 'Notification message']

如何替换字符串列表中字符串的具体子字符串？

How to substitute the concrete substring of a string in the string's list?

python

string