Python XML转Json之XML2Dict的使用方法

Python  /  管理员 发布于 7年前   161

1. Json读写方法

def parseFromFile(self, fname):  """  Overwritten to read JSON files.  """  f = open(fname, "r")  return json.load(f)def serializeToFile(self, fname, annotations):  """  Overwritten to write JSON files.  """  f = open(fname, "w")  json.dump(annotations, f, indent=4, separators=(',', ': '), sort_keys=True)  f.write("\n")

2. xml文件的工具包XML2Dict

将xml转换成Python本地字典对象， 访问子元素和字典常用方法类似，略有不同， 使用 “.”

注： 使用xml2dict库，需要在本地项目添加 xml2dict.py, object_dict.py，下载链接

加载xml文件

from xml2dict import XML2Dictxml = XML2Dict()r = xml.parse("待处理文件名.xml") 

xml示例[voc2007格式]：

<annotation>  <folder>VOC2007</folder>  <filename>AL_00001.JPG</filename>  <size>    <width>800</width>    <height>1160</height>    <depth>3</depth>  </size>  <object>    <name>l_faster</name>    <pose>Unspecified</pose>    <truncated>0</truncated>    <difficult>0</difficult>    <bndbox>      <xmin>270</xmin>      <ymin>376</ymin>      <xmax>352</xmax>      <ymax>503</ymax>    </bndbox>  </object>  <object>    <name>l_faster</name>    <pose>Unspecified</pose>    <truncated>0</truncated>    <difficult>0</difficult>    <bndbox>      <xmin>262</xmin>      <ymin>746</ymin>      <xmax>355</xmax>      <ymax>871</ymax>    </bndbox>  </object>  <object>    <name>r_faster</name>    <pose>Unspecified</pose>    <truncated>0</truncated>    <difficult>0</difficult>    <bndbox>      <xmin>412</xmin>      <ymin>376</ymin>      <xmax>494</xmax>      <ymax>486</ymax>    </bndbox>  </object>  <object>    <name>r_faster</name>    <pose>Unspecified</pose>    <truncated>0</truncated>    <difficult>0</difficult>    <bndbox>      <xmin>411</xmin>      <ymin>748</ymin>      <xmax>493</xmax>      <ymax>862</ymax>    </bndbox>  </object></annotation>

分析下这个文件的格式：

最外一层被<annotation></annotation>包围

往里一层是：<file_name></file_name>,<size></size>,<object></object>,其中object是列表，包括name和bndbox，示例访问annotation下级元素

# -*- coding: utf-8 -*-from xml2dict import XML2Dictxml = XML2Dict()r = xml.parse('Annotations/AL_00001.xml')for item in r.annotation:  print itemprint '------------'for item in r.annotation.object:  print item.name, item.bndbox.xmin, item.bndbox.xmax, item.bndbox.ymin, item.bndbox.ymax

执行结果：

objectfoldersizevaluefilename------------l_faster 270 352 376 503l_faster 262 355 746 871r_faster 412 494 376 486r_faster 411 493 748 862

完整代码[xml2json]

# -*- coding: utf-8 -*-from xml2dict import XML2Dictimport jsonimport globdef serializeToFile(fname, annotations):  """  Overwritten to write JSON files.  """  f = open(fname, "w")  json.dump(annotations, f, indent=4, separators=(',', ': '), sort_keys=True)  f.write("\n")def getAnnos(file_name="", prefix=''):  xml = XML2Dict()  root = xml.parse(file_name)  # get a dict object  anno = root.annotation  image_name = anno.filename  item = {'filename': prefix + image_name, 'class': 'image', 'annotations': []}  for obj in anno.object:    cls = {'l_faster': 'C1', 'r_faster': 'C2'}[obj.name]    box = obj.bndbox    x, y, width, height = int(box.xmin), int(box.ymin), int(box.xmax) - int(box.xmin), int(box.ymax) - int(box.ymin)    item['annotations'] += [{        "class": cls,        "height": height,        "width": width,        "x": x,        "y": y      }]  return itemif __name__ == '__main__':  annotations = []  anno_name = 'AR_001-550.json'  files = glob.glob('Annotations/AR_*.xml')  files = sorted(files)  # print files.sort()  for filename in files:    item = getAnnos(filename, prefix='TFS/JPEGImages/')    print item    print '-----------------'    annotations += [item] #"xmls/AL_00001.xml"  serializeToFile(anno_name, annotations)

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