python 批量修改文件名称

# 批量修改当前文件下所有文件名

import os

path = "d:/test"

files = os.listdir(path)
# print(os.listdir(path))  ['123.txt', '456.txt', '789.txt']


order = 1
for file in files:
    old = path + os.sep + file  # d:/test/1.txt
    new = path + os.sep + "a" + str(order) + ".txt"    # d:/test/a1.txt
    os.rename(old, new)
    order += 1