批量调整xml元素中bndbox节点坐标大小Python

import os
import xml.etree.ElementTree as ET
  # 设置需要调整框大小xml文件夹路径
def edit_xml(xml_file,xminimum,yminimum,xmaximum,ymaximum):

    all_xml_file = os.path.join(path, xml_file)
    tree = ET.parse(all_xml_file)
    print(all_xml_file)
    objs = tree.findall('object')
    for ix, obj in enumerate(objs):
        obj_bnd = obj.find('bndbox')
        obj_xmin = obj_bnd.find('xmin')
        obj_ymin = obj_bnd.find('ymin')
        obj_xmax = obj_bnd.find('xmax')
        obj_ymax = obj_bnd.find('ymax')
        xmin = float(obj_xmin.text)
        ymin = float(obj_ymin.text)
        xmax = float(obj_xmax.text)
        ymax = float(obj_ymax.text)
        obj_xmin.text = str(round(xmin-xminimum))   #-左
        obj_ymin.text = str(round(ymin-yminimum))   #-上
        obj_xmax.text = str(round(xmax+xmaximum))   #+右
        obj_ymax.text = str(round(ymax+ymaximum))   #+下

    tree.write(all_xml_file, method='xml', encoding='utf-8')  # 覆盖更新xml文件

def Adjustborder(path,a,b,c,d):
    files = os.listdir(path)              # 获取文件名列表
    for i, file in enumerate(files):
        if file.endswith('.xml'):
            edit_xml(file,a,b,c,d)


  #xml文件路径
path = r'F:\xml'
#调整像素值，正数就是扩大，负值就是减少
xminimum=3
yminimum=3
xmaximum=3
ymaximum=3
Adjustborder(path,xminimum,yminimum,xmaximum,ymaximum)