如何将JSON解组为持续时间？

import json
import re

def parse_duration(json_data):
    # 解析JSON数据
    data = json.loads(json_data)
    
    # 提取持续时间字段
    duration_field = data['duration']
    
    # 解析持续时间
    duration = None
    if isinstance(duration_field, str):
        # 使用正则表达式提取ISO 8601格式的持续时间
        match = re.match(r'PT(\d+H)?(\d+M)?(\d+S)?', duration_field)
        if match:
            hours = int(match.group(1)[:-1]) if match.group(1) else 0
            minutes = int(match.group(2)[:-1]) if match.group(2) else 0
            seconds = int(match.group(3)[:-1]) if match.group(3) else 0
            duration = hours * 3600 + minutes * 60 + seconds
    elif isinstance(duration_field, (int, float)):
        # 假设持续时间以秒为单位
        duration = int(duration_field)
    
    return duration

# 示例JSON数据
json_data = '{"duration": "PT1H30M"}'

# 解析持续时间
duration = parse_duration(json_data)
print(duration)  # 输出结果：5400秒