搜索确切的字符串，匹配它.If没有匹配的条目添加参数也如果部分匹配修改python文件

def search_string(string, target):
    index = string.find(target)
    if index != -1:
        print("找到匹配的字符串，起始位置索引为：", index)
    else:
        print("未找到匹配的字符串")

# 调用示例
search_string("Hello, World!", "World")

找到匹配的字符串，起始位置索引为： 7

import re

def search_pattern(string, pattern):
    match = re.search(pattern, string)
    if match:
        print("找到匹配的字符串，起始位置索引为：", match.start())
    else:
        print("未找到匹配的字符串")

# 调用示例
search_pattern("Hello, World!", "W.*d")

找到匹配的字符串，起始位置索引为： 7

def modify_python_file(file_path, target, replacement):
    with open(file_path, 'r') as file:
        content = file.read()

    modified_content = content.replace(target, replacement)

    with open(file_path, 'w') as file:
        file.write(modified_content)

# 调用示例
modify_python_file("example.py", "old_string", "new_string")