import os
def alter(file,old_str,new_str):

    with open(file, "r", encoding="utf-8") as f1,open("%s.bak" % file, "w", encoding="utf-8") as f2:
        for lin in f1:
            if old_str in lin:
                lin = lin.replace(old_str, new_str)
            f2.write(lin)
    os.remove(file)
    os.rename("%s.bak" % file, file)



dest = "/home/ubt/PROCESS_DATA/0423_MIX/shuanghuitaishikaochang48g-weilongdamianjinxiangla65g" #文档的路径
for root, dirs, files in os.walk(dest):
    for file in files:
        if file.endswith('.xml'):
            print(file)
            alter('/home/ubt/PROCESS_DATA/0423_MIX/shuanghuitaishikaochang48g-weilongdamianjinxiangla65g/{}'.format(file), "weilongdamianjinxiangla65gw",
                  "weilongdamianjinxiangla65g")