python创建和删除文件

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#!/usr/bin/python #-*-coding:utf-8-*-       #指定编码格式，python默认unicode编码   import os directory = "./dir" os.chdir(directory)  #切换到directory目录 cwd = os.getcwd()  #获取当前目录即dir目录下 print("------------------------current working directory------------------")   def deleteBySize(minSize):     """删除小于minSize的文件（单位：K）"""     files = os.listdir(os.getcwd())  #列出目录下的文件     for file in files:         if os.path.getsize(file) < minSize * 1000:             os.remove(file)    #删除文件             print(file + " deleted")     return   def deleteNullFile():     '''删除所有大小为0的文件'''     files = os.listdir(os.getcwd())     for file in files:         if os.path.getsize(file)  == 0:   #获取文件大小             os.remove(file)             print(file + " deleted.")     return   def create():     '''根据本地时间创建新文件，如果已存在则不创建'''     import time     t = time.strftime('%Y-%m-%d',time.localtime())  #将指定格式的当前时间以字符串输出     suffix = ".docx"     newfile= t+suffix     if not os.path.exists(newfile):         f = open(newfile,'w')         print newfile         f.close()         print newfile + " created."     else:         print newfile + " already existed."     return hint = '''funtion:             1   create new file             2   delete null file             3   delete by size please input number:''' while True:     option = raw_input(hint)  #获取IO输入的值     if cmp(option,'1') == 0:         create()     elif cmp(option,'2') == 0:         deleteNullFile()     elif cmp(option,'3') == 0:         minSize = raw_input("minSize(K):")         deleteBySize(minSize)     elif cmp(option,'q') == 0:         print "quit !"         break     else:         print ("disabled input ,please try again....")