import os

directory = "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.")

    return

def 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")

    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

    #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."

    return

hint = '''funtion :

        1    create new file

        2    delete null file

        3    delete by size

        q    quit\n

please 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...")