使用ElementTree解析XML会生成空的csv文件

Question

我是Python的完全入门者，所以我不得不依靠一些教程来将这些代码放在一起。 它确实生成一个.csv文件，但结果为空（0kb）。 我发现其他有此问题的人都忘记了关闭文件，但这似乎不是这里的问题。 我很感谢任何提示。

这是xml，如果有帮助的话： https : //api.nextbike.net/maps/nextbike-live.xml?city=14

import xml.etree.ElementTree as ET
import csv

tree = ET.parse('nextbike-live.xml')
root = tree.getroot()

with open('Bike_pos.csv', 'w') as Bike_pos:
    csvwriter = csv.writer(Bike_pos)
    bike_head = []

    count = 0
    for member in root.findall('place'):
        bike = []
        if count == 0:
            station = member.find('name').tag
            bike_head.append(station)
            lat = member.find('lat').tag
            bike_head.append(lat)
            lon = member.find('lng').tag
            bike_head.append(lon)
            bikeno = member.find('bike_numbers').tag
            bike_head.append(bikeno)
            count = count + 1

        station = member.find('name').text
        bike.append(station)
        lat = member.find('lat').text
        bike.append(lat)
        lon = member.find('lng').text
        bike.append(lon)
        bikeno = member.find('bike_numbers').text
        csvwriter.writerow(bike)
Bike_pos.close()

Answer 1

我得到了一个好朋友的帮助。 我的xml源文件有几个孩子，我的代码没有搜索到。

他给了我这段代码，它像一个魅力一样工作，比我拥有的代码简单得多：

import xml.etree.ElementTree as ET
import csv

tree = ET.parse('nextbike-live-test.xml')
root = tree.getroot()

with open('Bike_pos.csv', 'w') as Bike_pos:
    csvwriter = csv.writer(Bike_pos)

    #CSV Header
    csvwriter.writerow(['Station', 'lat', 'lng', 'Bikes'])

    #Add info about each station
    for country in root.findall('country'):
        for city in country.findall('city'):
            for place in city.findall('place'):
                bike = []

                bike.append(place.get('name'))
                bike.append(place.get('lat'))
                bike.append(place.get('lng'))
                bike.append(place.get('bike_numbers'))
                csvwriter.writerow(bike)

Answer 2

为了简化起见，您也可以这样尝试：

import requests
import csv
from lxml.html import fromstring

with open("Bike_Details.csv","w",newline="") as infile:
    writer = csv.writer(infile)
    writer.writerow(["station","lat","lng","bike_num"])

    res = requests.get("https://api.nextbike.net/maps/nextbike-live.xml?city=14")
    root = fromstring(res.content)
    for items in root.cssselect("country city place"):
        station = items.get("name")
        lat = items.get("lat")
        lng = items.get("lng")
        bike_num = items.get("bike_numbers")
        print(station,lat,lng,bike_num)
        writer.writerow([station,lat,lng,bike_num])