使用lxml-python更新xml文件

我有一个文件，里面有会议室可用性的详细信息。 我编写了一个应用程序来读取xml文件并将信息存储到两个字典中，一个用于大会议室，另一个用于小会议室。我的任务是为请求的模式更新xml的“isMeetingRoomAvailable”参数

例如： 对于TowerName=TowerOne、meetingRoomName=ABC和MeetingRoomTimeStamp=“2018-05-31 00:45:00”，我必须将isMeetingRoomAvailable值更新为1

下面是我写的片段：

from lxml import etree

root = etree.parse('test.xml')
bigRoomAvailabilityDict = {}
smallRoomAvailabilityDict = {}
towerNames =  root.xpath("/root/Towers/Tower/TowerName")
MeetingRoomNames = root.xpath("/root/Towers/Tower/MeetingRooms/BigMeetingRooms/MeetingRoom/MeetingRoomName")
for tower in root.xpath("/root/Towers/Tower"):
    towerName = tower.xpath("TowerName")[0].text
    for lr in tower.xpath("MeetingRooms/BigMeetingRooms/MeetingRoom"):
        meetingRoomName = lr.xpath("MeetingRoomName")[0].text
        MeetingRoomMailId = lr.xpath("MeetingRoomMailId")[0].text

        str = towerName + " " + meetingRoomName + " " + MeetingRoomMailId
        for timeAvai in lr.xpath("MeetingRoomAvailabilityInfo"):
            time = timeAvai.xpath("MeetingRoomTimeStamp")[0].text
            isAvai = timeAvai.xpath("isMeetingRoomAvailable")[0].text
            key = str + " " + time
            bigRoomAvailabilityDict[key] = isAvai

    for small in tower.xpath("MeetingRooms/SmallMeetingRooms/MeetingRoom"):
        meetingRoomName = small.xpath("MeetingRoomName")[0].text
        MeetingRoomMailId = small.xpath("MeetingRoomMailId")[0].text

        str = towerName + " " + meetingRoomName + " " + MeetingRoomMailId
        for timeAvai in small.xpath("MeetingRoomAvailabilityInfo"):
            time = timeAvai.xpath("MeetingRoomTimeStamp")[0].text
            isAvai = timeAvai.xpath("isMeetingRoomAvailable")[0].text
            key = str + " " + time
            smallRoomAvailabilityDict[key] = isAvai
def updateXML(towerName, meetinRoomName, timeStampVal):
    roomsFromXml = root.xpath("/root/Towers/Tower/MeetingRooms/BigMeetingRooms/MeetingRoom")
    # print(roomsFromXml)
    for index in roomsFromXml:
        roomNames = index.xpath("MeetingRoomName")
        for rooms in roomNames:
            # print(rooms.text)
            if rooms.text == meetinRoomName:
                allTimeStamps = index.xpath("MeetingRoomAvailabilityInfo")
                for timeStamps in allTimeStamps:
                    counter = 0
                    for myTime in timeStamps.xpath("MeetingRoomTimeStamp"):
                        counter += 1
                        if myTime.text == timeStampVal:
                            break
                    for isAvai in timeStamps.xpath("isMeetingRoomAvailable"):
                        counter -= 1
                        if counter == 0:
                            isAvai.text = 1

# for key, value in bigRoomAvailabilityDict.items():
#     print(key, "  " , value)

来自链接的XML文件

<root>
  <Towers>
    <Tower>
      <TowerName>Tower one</TowerName>
      <MeetingRooms>
        <BigMeetingRooms>
          <MeetingRoom>
            <MeetingRoomName>ABC</MeetingRoomName>
            <MeetingRoomMailId>mail_id_ABC</MeetingRoomMailId>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 00:00:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 00:15:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 00:30:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 00:45:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 01:00:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 01:15:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 01:30:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 01:45:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 02:00:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 02:15:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 02:30:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 02:45:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 03:00:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 03:15:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 03:30:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 03:45:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 04:00:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 04:15:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 04:30:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 04:45:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 05:00:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
          </MeetingRoom>
          <MeetingRoom>
            <MeetingRoomName>JKL</MeetingRoomName>
            <MeetingRoomMailId>mail_id_JKL</MeetingRoomMailId>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 00:00:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 00:15:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 00:30:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 00:45:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 01:00:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 01:15:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 01:30:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 01:45:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 02:00:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 02:15:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 02:30:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 02:45:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 03:00:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 03:15:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 03:30:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 03:45:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 04:00:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 04:15:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 04:30:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 04:45:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 05:00:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
          </MeetingRoom>
        </BigMeetingRooms>
        <SmallMeetingRooms>
          <MeetingRoom>
            <MeetingRoomName>XYZ</MeetingRoomName>
            <MeetingRoomMailId>mail_id_XYZ</MeetingRoomMailId>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 00:00:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 00:15:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 00:30:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 00:45:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 01:00:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 01:15:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 01:30:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 01:45:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 02:00:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 02:15:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 02:30:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 02:45:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 03:00:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 03:15:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 03:30:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 03:45:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 04:00:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 04:15:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 04:30:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 04:45:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
            <MeetingRoomAvailabilityInfo>
              <MeetingRoomTimeStamp>2018-05-31 05:00:00</MeetingRoomTimeStamp>
              <isMeetingRoomAvailable>0</isMeetingRoomAvailable>
            </MeetingRoomAvailabilityInfo>
          </MeetingRoom>
        </SmallMeetingRooms>
      </MeetingRooms>
    </Tower>
  </Towers>
</root>

一号塔
基础知识
邮寄地址
2018-05-31 00:00:00
0
2018-05-31 00:15:00
0
2018-05-31 00:30:00
0
2018-05-31 00:45:00
0
2018-05-31 01:00:00
0
2018-05-31 01:15:00
0
2018-05-31 01:30:00
0
2018-05-31 01:45:00
0
2018-05-31 02:00:00
0
2018-05-31 02:15:00
0
2018-05-31 02:30:00
0
2018-05-31 02:45:00
0
2018-05-31 03:00:00
0
2018-05-31 03:15:00
0
2018-05-31 03:30:00
0
2018-05-31 03:45:00
0
2018-05-31 04:00:00
0
2018-05-31 04:15:00
0
2018-05-31 04:30:00
0
2018-05-31 04:45:00
0
2018-05-31 05:00:00
0
JKL
邮件地址
2018-05-31 00:00:00
0
2018-05-31 00:15:00
0
2018-05-31 00:30:00
0
2018-05-31 00:45:00
0
2018-05-31 01:00:00
0
2018-05-31 01:15:00
0
2018-05-31 01:30:00
0
2018-05-31 01:45:00
0
2018-05-31 02:00:00
0
2018-05-31 02:15:00
0
2018-05-31 02:30:00
0
2018-05-31 02:45:00
0
2018-05-31 03:00:00
0
2018-05-31 03:15:00
0
2018-05-31 03:30:00
0
2018-05-31 03:45:00
0
2018-05-31 04:00:00
0
2018-05-31 04:15:00
0
2018-05-31 04:30:00
0
2018-05-31 04:45:00
0
2018-05-31 05:00:00
0
XYZ
邮件id XYZ
2018-05-31 00:00:00
0
2018-05-31 00:15:00
0
2018-05-31 00:30:00
0
2018-05-31 00:45:00
0
2018-05-31 01:00:00
0
2018-05-31 01:15:00
0
2018-05-31 01:30:00
0
2018-05-31 01:45:00
0
2018-05-31 02:00:00
0
2018-05-31 02:15:00
0
2018-05-31 02:30:00
0
2018-05-31 02:45:00
0
2018-05-31 03:00:00
0
2018-05-31 03:15:00
0
2018-05-31 03:30:00
0
2018-05-31 03:45:00
0
2018-05-31 04:00:00
0
2018-05-31 04:15:00
0
2018-05-31 04:30:00
0
2018-05-31 04:45:00
0
2018-05-31 05:00:00
0

如果我们只关注更新XML，我要做的是将树作为参数传递，并传递包含其他值的dict

可以在xpath谓词中使用这些值来缩小要更新的元素的范围。这应该比使用for循环测试元素值简单得多

例如