如何在Python中使用replace和切片操作替换字符串中ACC后缀的课程编号

你提到的写法无法实现需求，Python 原生的str.replace()仅支持精确匹配固定字符串，不支持通配符匹配动态的4位课程编码，因此my_string.replace(ACC ****, ACC + course_code)的写法不能正常运行。

正确实现方案需要用到Python标准库的正则表达式模块re，示例代码如下：

import re

# 原字符串与变量定义
my_string = "Once upon a time, there was a boy. He went to school and enrolled to a course ACC 2011, Later he enrolled to another course ACC 4589. He did well in both of the courses"
course_code = 1111

# 匹配所有「ACC + 空格 + 4位数字」的内容并替换
new_string = re.sub(r'ACC \d{4}', f'ACC {course_code}', my_string)

运行后输出的new_string就是你需要的结果：

"Once upon a time, there was a boy. He went to school and enrolled to a course ACC 1111, Later he enrolled to another course ACC 1111. He did well in both of the courses"

规则说明 #

正则表达式r'ACC \d{4}'中，\d代表匹配任意阿拉伯数字，{4}代表连续匹配4个数字，刚好匹配你场景中的课程编码格式；re.sub()默认会替换字符串中所有匹配到的内容，符合你全部替换的需求。

内容的提问来源于stack exchange，提问作者Sam