如何使用itertools替换来设置字符替换限制？

import itertools

import itertools

def replace_with_limit(text, old, new, limit):
    count = 0
    result = ''
    for char in text:
        if char == old:
            count += 1
            if count > limit:
                result += char
            else:
                result += new
        else:
            result += char
    return result

text = 'Hello, world!'
old = 'o'
new = '*'
limit = 1

replaced_text = replace_with_limit(text, old, new, limit)
print(replaced_text)

Hell*, w*rld!