使用Python替换文件中最后两个特定单词的出现

Question

我正在打开文件并搜索特定单词，以替换文件中该单词的最后2个匹配项。你知道吗

我已打开文件并尝试替换，但它正在替换前2个事件。我想替换最后两次出现的地方

s = open("mount.txt").read()
s = s.replace('mickey', 'minnie',2)
f = open("mount.txt", 'w')
f.write(s)
f.close()

这是文本只是一个例子。实际文本不同。你知道吗

#mount.txt# 

I'm mickey. minnie is my friend.
mickey is the good name given by my parents.
mickey loves to play cricket.
Where as his parents doesn't like Mickey's habit.



#Replaces text[mount.txt]#

I'm mickey. minnie is my friend.
Mickey is the good name given by my parents.
minnie loves to play cricket.
Where as his parents doesn't like minnie's habit.

Answer 1

s = open("mount.txt").read()
sr = s.rsplit('mickey', 2)
s = 'minnie'.join(sr)
f = open("mount.txt", 'w')
f.write(s)
f.close()

Answer 2

这里有一个可能的解决办法。注意：这个版本是区分大小写的，所以mickey和Mickey不被视为相同的；但是如果您需要不区分大小写的替换，这个代码至少会为您指明一个完整解决方案的可能方向。你知道吗

def func(word_to_search, replacement_word, num_replacements):
    with open('test.txt') as f:
        old_lines = f.readlines()

    new_lines = []
    counter = 0
    for line in reversed(old_lines):            # iterate in reverse order
        if counter < num_replacements:
            # only check if 'num_replacements' has not been reached yet

            while word_to_search in line:
                line = line.replace(word_to_search, replacement_word, 1)
                counter += 1

                if counter >= num_replacements:
                    # exit while loop because 'num_replacements' has been reached
                    break

        new_lines.append(line)

    # reverse list again to get original order
    new_lines = list(reversed(new_lines))

    with open('test2.txt', 'w') as f:
        f.writelines(new_lines)


if __name__ == '__main__':
    func(
        word_to_search='mickey',
        replacement_word='MINNIE',
        num_replacements=2)

输入：

I'm mickey. minnie is my friend.
mickey is the good name given by my parents.
mickey loves to play cricket.
Where as his parents doesn't like Mickey's habit.

最后一行的输出（Mickey没有被替换，因为它不是全部小写）：

I'm mickey. minnie is my friend.
MINNIE is the good name given by my parents.
MINNIE loves to play cricket.
Where as his parents doesn't like Mickey's habit.