#!/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,'') == 0:

        create()

    elif cmp(option,'') == 0:

        deleteNullFile()

    elif cmp(option,'') == 0:

        minSize = raw_input("minSize(K):")

        deleteBySize(minSize)

    elif cmp(option,'q') == 0:

        print "quit !"

        break

    else:

        print ("disabled input ,please try again....")