使用python

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次出现。

我已打开文件并尝试替换，但它正在替换前两次出现的文件。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()

这只是文本。实际文字不同。

#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

这是一个可能的解决方案。注意：此版本区分大小写，因此mickey和Mickey不能被视为相同；但是如果您需要不区分大小写的替换，则此代码至少会为您提供一个完整解决方案的可能方向。

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.

输出（最后一行上的Mickey未被替换，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.