Python代码如下：

import osdirectory = "E:\\学习日志\\"os.chdir(directory) # 改变当前工作目录cwd = os.getcwd() # 查看当前工作目录print("--------------current working directory : " + cwd + "----------")def deleteBySize(minSize):    """删除小于minSize的文件（单位：K）"""    files = os.listdir(os.getcwd()) # 列出目录中文件    for file in files:    ##    print file + " : " + str(os.path.getsize(file))        if os.path.getsize(file) < minSize * 1000:            os.remove(file)            print(file + " deleted.")    returndef deleteNullFile():    '''删除所有大小为0的文件'''    files = os.listdir(os.getcwd()) # 列出目录中文件    for file in files:        if os.path.getsize(file) == 0: #得到文件大小，如果是目录返回0            os.remove(file)            print(file + " deleted")    returndef create():    '''根据本地时间创建新文件，如果已存在则不创建'''    import time    #将指定的struct_time(默认为当前时间)，根据指定的格式化字符串输出    t = time.strftime('%Y-%m-%d',time.localtime())     suffix = ".docx"    newFile =os.getcwd() + "\\" + t + suffix     if not os.path.exists(newFile):        f = open(newFile,'w')        f.close()        print newFile + " created."    else:        print newFile + " already exist."    returnhint = '''funtion :         1    create new file        2    delete null file        3    delete by size        q    quit\nplease input number: '''while True:    option = raw_input(hint)    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...")

 

主要涉及到的就是一些文件操作函数和时间函数。