像这样的xml文件，我们可以通过代码批量转换为txt文件格式：

新建一个xml2txt.py文件，

        上代码，直接复制粘贴

import xml.etree.ElementTree as ET
import os

def convert(size, box):
    x_center = (box[0] + box[1]) / 2.0
    y_center = (box[2] + box[3]) / 2.0
    x = x_center / size[0]
    y = y_center / size[1]
    w = (box[1] - box[0]) / size[0]
    h = (box[3] - box[2]) / size[1]
    return (x, y, w, h)

def convert_annotation(xml_files_path, save_txt_files_path, classes):
    xml_files = os.listdir(xml_files_path)
    print(xml_files)
    for xml_name in xml_files:
        print(xml_name)
        xml_file = os.path.join(xml_files_path, xml_name)
        out_txt_path = os.path.join(save_txt_files_path, xml_name.split('.')[0] + '.txt')
        out_txt_f = open(out_txt_path, 'w')
        tree = ET.parse(xml_file)
        root = tree.getroot()
        size = root.find('size')
        w = int(size.find('width').text)
        h = int(size.find('height').text)

        for obj in root.iter('object'):
            difficult = obj.find('difficult').text
            cls = obj.find('name').text
            if cls not in classes or int(difficult) == 1:
                continue
            cls_id = classes.index(cls)
            xmlbox = obj.find('bndbox')
            b = (float(xmlbox.find('xmin').text), float(xmlbox.find('xmax').text),
                 float(xmlbox.find('ymin').text), float(xmlbox.find('ymax').text))
            bb = convert((w, h), b)
            out_txt_f.write(str(cls_id) + " " + " ".join([str(a) for a in bb]) + "\n")
        out_txt_f.close()

if __name__ == '__main__':
    classes1 = ['x']
    xml_files1 = r' '
    save_txt_files1 = r' '
    convert_annotation(xml_files1, save_txt_files1, classes1)

修改以下代码即可：

1. 标签名

    classes1 = ['x', 'y', 'z'] 

2. xml文件所在位置

    xml_files1 = r'C:\Users\Administrator\Desktop\data\xml'

3. txt文件导出位置

    save_txt_files1 = r'C:\Users\Administrator\Desktop\data\txt'