Python 创建新文件时避免覆盖已有的同名文件的解决方法

import os

def check_filename_available(filename):
  n=[0]
  def check_ (file_name):
    file_name_new=file_name
    if os.path.isfile(file_name):
      file_name_new=file_name[:file_name.rfind(\'.\')]+\'_\'+str(n[0])+file_name[file_name.rfind(\'.\'):]
      n[0]+=1
    if os.path.isfile(file_name_new):
      file_name_new=check_ (file_name)
    return file_name_new
  return_name=check_ (filename)
  return return_name
with open(check_filename_available(\'t.txt\'),\'w\') as f:
  f.write(\'Checking func!\')