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小編這次要用代碼詳解如何將python代碼xml轉txt，文章內容豐富，感興趣的小伙伴可以來了解一下，希望大家閱讀完這篇文章之后能夠有所收獲。
為了訓練深度學習模型，經常要整理大量的標注數據，需統一不同格式的標注數據，一般情況下習慣讀取TXT格式的數據。但實際中經常遇到XML格式的標注數據，在此舉例：1.讀取XML標注數據；2.寫入TXT文件。
XML標注數據如下
<annotation verified="no"> <folder>suE</folder> <filename>Drivingrecord_001</filename> <path>C:\Desktop\Drivingrecord_001.jpg</path> <source> <database>Unknown</database> </source> <size> <width>1920</width> <height>1080</height> <depth>3</depth> </size> <segmented>0</segmented> <object> <name>蘇E*****-藍-1-白,灰-大眾-上海大眾-桑塔納-尚納</name> <flag>polygon</flag> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <leftTopx>170</leftTopx> <leftTopy>704</leftTopy> <rightTopx>167</rightTopx> <rightTopy>729</rightTopy> <rightBottomx>242</rightBottomx> <rightBottomy>735</rightBottomy> <leftBottomx>243</leftBottomx> <leftBottomy>710</leftBottomy> </bndbox> </object> <object> <name>蘇E*****-藍-1-黃-雷克薩斯-雷克薩斯(進口)-雷克薩斯RX</name> <flag>polygon</flag> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <leftTopx>733</leftTopx> <leftTopy>721</leftTopy> <rightTopx>733</rightTopx> <rightTopy>759</rightTopy> <rightBottomx>881</rightBottomx> <rightBottomy>760</rightBottomy> <leftBottomx>882</leftBottomx> <leftBottomy>722</leftBottomy> </bndbox> </object> <object> <name>蘇*****-藍-1-黑-寶馬-寶馬(進口)-寶馬7系</name> <flag>polygon</flag> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <leftTopx>1274</leftTopx>
<leftTopy>657</leftTopy> <rightTopx>1274</rightTopx> <rightTopy>671</rightTopy> <rightBottomx>1325</rightBottomx> <rightBottomy>670</rightBottomy> <leftBottomx>1326</leftBottomx> <leftBottomy>656</leftBottomy> </bndbox> </object> <object> <name>蘇*****-藍-1-灰-標致-東風標致-標致307</name> <flag>polygon</flag> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <leftTopx>1609</leftTopx> <leftTopy>658</leftTopy> <rightTopx>1611</rightTopx> <rightTopy>671</rightTopy> <rightBottomx>1659</rightBottomx> <rightBottomy>669</rightBottomy> <leftBottomx>1657</leftBottomx> <leftBottomy>656</leftBottomy> </bndbox> </object> </annotation>
在此，我們只需要圖片名filename，和每個object的坐標（四個點的坐標）
Drivingrecord_001.jpg 170 704 167 729 242 735 243 710 733 721 733 759 881 760 882 722 1274 657 1274 671 1325 670 1326 656 1609 658 1611 671 1659 669 1657 656
利用xml.dom.*模塊，文件對象模塊DOM在讀取XML文件時，一次讀取整個文件，將其所有數據保存在一個樹結構中，此時，可利用DOM的各種函數來讀取目標數據。在此，利用xml.dom.minidom解析XML文件。
并將目標數據寫入TXT文檔。
# -*- coding: utf-8 -*-
"""
Created on Fri Mar 2 15:36:44 2018
@author: gg
"""
import xml.dom.minidom
import os
save_dir = 'D:\plate_train'
if not os.path.exists(save_dir):
os.mkdir(save_dir)
f = open(os.path.join(save_dir, 'landmark.txt'), 'w')
DOMTree = xml.dom.minidom.parse('D:\plate_train\label\Drivingrecord_001.xml')
annotation = DOMTree.documentElement
filename = annotation.getElementsByTagName("filename")[0]
imgname = filename.childNodes[0].data+'.jpg'
print(imgname)
objects = annotation.getElementsByTagName("object")
loc = [imgname] #文檔保存格式：文件名 坐標
for object in objects:
bbox = object.getElementsByTagName("bndbox")[0]
leftTopx = bbox.getElementsByTagName("leftTopx")[0]
lefttopx = leftTopx.childNodes[0].data
print(lefttopx)
leftTopy = bbox.getElementsByTagName("leftTopy")[0]
lefttopy = leftTopy.childNodes[0].data
print(lefttopy)
rightTopx = bbox.getElementsByTagName("rightTopx")[0]
righttopx = rightTopx.childNodes[0].data
print(righttopx)
rightTopy = bbox.getElementsByTagName("rightTopy")[0]
righttopy = rightTopy.childNodes[0].data
print(righttopy)
rightBottomx = bbox.getElementsByTagName("rightBottomx")[0]
rightbottomx = rightBottomx.childNodes[0].data
print(rightbottomx)
rightBottomy = bbox.getElementsByTagName("rightBottomy")[0]
rightbottomy = rightBottomy.childNodes[0].data
print(rightbottomy)
leftBottomx = bbox.getElementsByTagName("leftBottomx")[0]
leftbottomx = leftBottomx.childNodes[0].data
print(leftbottomx)
leftBottomy = bbox.getElementsByTagName("leftBottomy")[0]
leftbottomy = leftBottomy.childNodes[0].data
print(leftbottomy)
loc = loc + [lefttopx, lefttopy, righttopx, righttopy, rightbottomx, rightbottomy, leftbottomx, leftbottomy]
for i in range(len(loc)):
f.write(str(loc[i])+' ')
f.write('\t\n')
f.close()
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