批量更新log文件名

原文件名为“web.log","web.log.1","web.log.2"，运行后文件名改为“web.log.1","web.log.2","web.log.3"

采用递归的方式，依次增加文件编号

import os
import shutil
def rotate_log_file(path):
    if not os.path.exists(path):
        raise IOError("log not exist")
    else:
        file_path,old_name=os.path.split(path)
        new_name=make_version(old_name)
        new_path=os.path.join(file_path,new_name)
        if os.path.exists(new_path):
            rotate_log_file(new_path)
        shutil.move(path,new_path)
def make_version(old_name):
    result = list(old_name.split("."))
    if result[-1]=="log":
        return old_name+"."+"1"
    else:
        return old_name[:len(result[-1])*(-1)] + str(int(result[-1])+1)
if __name__=="__main__":
    path=r"C:\Users\Administrator\Desktop\python\test\web.log"
    rotate_log_file(path)