Python re:如何在re-sub repl_string中连接字符串和dict值？

import re

def replace(match):
    # 获取匹配到的字符串
    matched_string = match.group(0)
    
    # 获取需要替换的字典值
    key = matched_string[1:-1]  # 去除花括号
    value = my_dict.get(key, '')
    
    # 连接字符串和字典值
    return 'replacement: ' + value

# 定义需要替换的字符串
text = 'Hello {name}, your age is {age}.'

# 定义字典，存储替换的值
my_dict = {'name': 'John', 'age': '25'}

# 使用re.sub()进行替换
result = re.sub(r'{\w+}', replace, text)

print(result)

Hello replacement: John, your age is replacement: 25.