Python - 使用 ElementTree 解析 XML 数据答案

【问题标题】：Python - Parsing XML data with ElementTreePython - 使用 ElementTree 解析 XML 数据
【发布时间】：2020-05-07 21:15:18
【问题描述】：

我正在为我的 Discord 机器人开发一个模块，该模块将从 URL 获取数据并将其分类到嵌入中。我花了几个小时尝试不同的方法来让它工作，我设法让它显示我需要的东西。现在，当我从 XML 更改为 XML2 URL 时出现了一些问题（我需要更多数据），它只是不想再工作了。

import xml.etree.ElementTree as ET
import requests


tree = ET.fromstring(requests.get('http://vatbook.euroutepro.com/xml.php?fir=LJLA').text)
#Testing what is displayed
for atcs in tree:
    callsign = atcs.find('callsign')
    name = atcs.find('name')
    time_start = atcs.find('time_start')
    time_end = atcs.find('time_end')
    if callsign is not None:
        print(f"{name.text} booked {callsign.text} from {time_start.text} to {time_end.text}")

输出：

Mirza Ibrahimovic booked LJLJ_TWR from 2020-05-19 1800 to 2020-05-19 2100
Mirza Ibrahimovic booked LJLJ_APP from 2020-05-19 1800 to 2020-05-19 2100

我的问题是，当我将 first url 替换为 secound url 时，我的代码不会显示任何内容。有什么想法吗？

【问题讨论】：

标签： python xml parsing python-requests

【解决方案1】：

由于两个 URL 的结构不同，请考虑有条件地检查 atc 节点是否存在，然后将动态搜索路径传递给 iterfind。下面使用内置的urllib 模块从 URL 解析 XML：

from urllib.request import urlopen
import xml.etree.ElementTree as ET

def vatbook_parse(url):
    with urlopen(url) as f:
        tree = ET.parse(f)
        root = tree.getroot()

        # CONDITIONALLY SET SEARCH PATH
        path = './/atcs/booking' if tree.find('atc') is None else './/atc'

        for atcs in root.iterfind(path):
            callsign = atcs.find('callsign')
            name = atcs.find('name')
            time_start = atcs.find('time_start')
            time_end = atcs.find('time_end')

            if callsign is not None:
                print(f"{name.text} booked {callsign.text} from {time_start.text} to {time_end.text}")

第一个网址

vatbook_parse('http://vatbook.euroutepro.com/xml.php?fir=LJLA')

# Mirza Ibrahimovic booked LJLJ_APP from 2020-05-19 18:00:00 to 2020-05-19 21:00:00
# Mirza Ibrahimovic booked LJLJ_TWR from 2020-05-19 18:00:00 to 2020-05-19 21:00:00

第二个网址

vatbook_parse('http://vatbook.euroutepro.com/xml2.php?fir=LJLA')

# Mirza Ibrahimovic booked LJLJ_APP from 2020-05-19 18:00:00 to 2020-05-19 21:00:00
# Mirza Ibrahimovic booked LJLJ_TWR from 2020-05-19 18:00:00 to 2020-05-19 21:00:00

【讨论】：

它也像我的评论中提到的那样工作。我忘了添加要查找的内容，这就是为什么我无法得到回复。当我添加 for atcs in root.find('atcs') 时，它按预期工作。我修改了代码以在不和谐服务器中显示为嵌入，但感谢您的帮助

【解决方案2】：

我发现我忘记添加一小部分代码以使其运行。

所以这是我的解决方案：

import xml.etree.ElementTree as ET

import requests

atc = ["ADR_CTR", "ADR_W_CTR", "ADR_U_CTR", "ADR_E_CTR", "LDZO_CTR", "LJLA_CTR", "LYBA_CTR", "LWSS_CTR", "LAAA_CTR", "LQSB_CTR", "LJLJ_TWR", "LJLJ_APP", "LJLJ_GND", "LJMB_TWR", "LJMB_APP", "LJPZ_TWR", "LJPZ_APP", "LDZA_APP", "LDZA_TWR", "LDZA_GND", "LDDU_TWR", "LDDU_APP", "LDSP_TWR", "LDSP_APP", "LDPL_TWR", "LDPL_APP", "LDRI_TWR", "LDZD_TWR", "LDZD_APP", "LDOS_TWR", "LDOS_APP", "LYBE_APP",
       "LYBE_TWR", "LYBE_GND", "LYTV_TWR", "LYPG_TWR", "LYPG_APP", "LYNI_TWR", "LYNI_APP", "LATI_APP", "LATI_TWR", "LATI_GND", "LWSK_TWR", "LWSK_APP", "LWSK_GND", "LWOH_TWR", "BKPR_TWR", "BKPR_APP", "LQSA_TWR", "LQSA_GND", "LQSA_APP", "LQMO_TWR", "LQMO_APP", "LQBK_TWR", "LQBK_APP", "LQTZ_TWR", "LQTZ_APP", "LYUZ_TWR", "LYUZ_APP", "LYKV_APP", "LYKV_TWR", "LDZO_T_CTR", "LJLA_T_CTR", "LYBA_T_CTR", 
       "LWSS_T_CTR", "LAAA_T_CTR", "LQSB_T_CTR", "LJLJ_T_TWR", "LJLJ_T_APP", "LJLJ_T_GND", "LJMB_T_TWR", "LJMB_T_APP", "LJPZ_T_TWR", "LJPZ_T_APP", "LDZA_T_APP", "LDZA_T_TWR", "LDZA_T_GND", "LDDU_T_TWR", "LDDU_T_APP", "LDSP_T_TWR", "LDSP_T_APP", "LDPL_T_TWR", "LDPL_T_APP", "LDRI_T_TWR", "LDZD_T_TWR", "LDZD_T_APP", "LDOS_T_TWR", "LDOS_T_APP", "LYBE_T_APP",
       "LYBE_T_TWR", "LYBE_T_GND", "LYTV_T_TWR", "LYPG_T_TWR", "LYPG_T_APP", "LYNI_T_TWR", "LYNI_T_APP", "LATI_T_APP", "LATI_T_TWR", "LATI_T_GND", "LWSK_T_TWR", "LWSK_T_APP", "LWSK_T_GND", "LWOH_T_TWR", "BKPR_T_TWR", "BKPR_T_APP", "LQSA_T_TWR", "LQSA_T_GND", "LQSA_T_APP", "LQMO_T_TWR", "LQMO_T_APP", "LQBK_T_TWR", "LQBK_T_APP", "LQTZ_T_TWR", "LQTZ_T_APP", "LYUZ_T_TWR", "LYUZ_T_APP", "LYKV_T_APP", "LYKV_T_TWR"]

tree = ET.fromstring(requests.get('http://vatbook.euroutepro.com/xml2.php?fir=').text)
#Testing what is displayed
for atcs in tree.find('atcs'):
    callsign = atcs.find('callsign')
    name = atcs.find('name')
    time_start = atcs.find('time_start')
    time_end = atcs.find('time_end')
    if callsign is not None:
    print(f"{name.text} booked {callsign.text} from {time_start.text} to {time_end.text}")

【讨论】：

嗯...解决方案不适用于第一个 URL。第一个 XML 中没有 atcs 节点，但有 atc。而长长的atc 列表有什么用？
是的解决方案不适用于第一个 URL，但对于第二个有效，我需要它，因为第二个提供更多数据并且没有义务提供 FIR，因此我可以收集数据多个 FIR。我不需要关于 ATCS 或飞行员的所有数据，我只需要其中的一些。此列表用于驱动某些软件以在日历中显示预订，我想获取该数据并将其发送到我的 Discord 服务器。