如何使用公式计算有条件的新字符串中的数字

import re

def calculate_new_string(original_string, condition):
    # Step 1: 提取原始字符串中的数字
    numbers = re.findall(r'\d+', original_string)
    
    # Step 2: 根据条件筛选出需要计算的数字
    filtered_numbers = [int(num) for num in numbers if condition(num)]
    
    # Step 3: 对筛选出的数字进行计算
    calculated_numbers = [num * 2 for num in filtered_numbers]  # 以将数字乘以2为例
    
    # Step 4: 将计算结果替换回原始字符串中的相应位置
    new_string = original_string
    for i, num in enumerate(filtered_numbers):
        new_string = new_string.replace(str(num), str(calculated_numbers[i]))
    
    return new_string

# 示例调用
original_string = "abc123def456ghi789"
condition = lambda num: int(num) > 500  # 筛选出大于500的数字
new_string = calculate_new_string(original_string, condition)
print(new_string)