python写入文件失败且程序提前中止

import requests

url = 'http://scxk.nmpa.gov.cn:81/xk/itownet/portalAction.do?method=getXkzsList'
headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36'}
param = {'method':'getXkzsById'}
url2 = 'http://scxk.nmpa.gov.cn:81/xk/itownet/portalAction.do?method=getXkzsById'
j = 1
for i in range(1,3):
    try:
        data = {
            'on': 'true',
            'page': i,
            'pageSize': '15',
            'productName': '',
            'conditionType': '1',
            'applyname': '',
            'applysn': ''
        }
        response = requests.post(url,data = data,headers = headers)
        obj = response.json()
        list_det = obj.get('list')
        try:
            for dic_det in list_det:
                data2 = {'id': dic_det.get('ID')}
                response2 = requests.post(url2, data=data2, params=param, headers=headers)
                result = response2.json()
                epsName = result.get('epsName')
                print(epsName)
                print(result)
                f = open(f'{epsName}.txt','w',encoding='utf-8')
                f.write(result)
        except:
            pass
    except:
        pass

删掉写文件的两行是可以正常输出的（一共30个）

不删的话输出完第二个就结束了，而且只会创建两个空的txt文件（文件名是正确的）

result 是字典或列表，在写入文件时要转成字符串
f.write(str(result))