使用python备份文件

想写个定时备份文件的功能，这个功能需要实现：
1.搜索指定的目录里是否存在当天的文件
2.如果存在压缩并加密文件
3.通过ftp上传到备份服务器
4.在备份服务器上定时将文件拷贝到移动硬盘并定时清理文件

1.搜索指定目录

import glob
import os
import shutil

class FileHelper:
    def __init__(self, searchdir, searchstr):
        self.dir = searchdir
        self.searchstr = searchstr

    def get_sourcefile(self):
        sourcepath = ("{searchdir}\*{searchstr}*".format(searchdir=self.dir, searchstr=self.searchstr))
        return glob.glob(sourcepath)

    @staticmethod
    def get_destfile(sourcefile, destdir):
        tail = os.path.split(sourcefile)[1]
        return os.path.join(destdir, tail[:tail.rfind('.')] + '.zip')

    @staticmethod
    def get_shortfilename(sourcefile, destdir):
        tail = os.path.split(sourcefile)[1]
        return os.path.join(destdir, tail)

    @staticmethod
    def copyfile(sourcefilename, destfilename):
        shutil.copyfile(sourcefilename, destfilename)

    @staticmethod
    def deletefile(filename):
        os.remove(filename)

2.压缩文件
本来想通过Python自带的zipfile类来实现的，如下代码所示。

import zipfile

class Zip(object):

    def __init__(self, sourcefilename, destfilename, password):
        self.sourcefilename = sourcefilename
        self.destfilename = destfilename
        self.password = password

    def zip(self):
        azip = zipfile.ZipFile(self.destfilename, 'w')
        azip.setpassword(self.password.encode('utf-8'))
        azip.write(self.sourcefilename)

结果生成的压缩文件，不用密码都可以打开，查了Python的文档才知道
zipFile.setpassword(pwd)

Set pwd as default password to extract encrypted files.
这个密码是用来解压文件时候用的，至于压缩文件的时候怎么设置密码，就不知道了。。。
所以退而求其次，用7zip的命令行方式了

import os

class Zip(object):

    def __init__(self, sourcepath, destpath, password):
        self.sourcepath = sourcepath
        self.destpath = destpath
        self.password = password

    def zipfile(self):
        pipe = os.popen("7z a -tzip {destpath} -p{password} {sourcepath}".format(destpath=self.destpath,
                                                                                 password=self.password,
                                                                                 sourcepath=self.sourcepath))
        pipe.read()
        pipe.close()

3.上传FTP

import ftplib

class FileUpaloder:

    def __init__(self, host, username, password, localfile, remotefile):
        self.host = host
        self.username = username
        self.password = password
        self.localfile = localfile
        self.remotefile = remotefile

    def upload(self):
        f = ftplib.FTP(self.host)
        f.login(self.username, self.password)
        bufsize = 1024
        fp = open(self.localfile, 'rb')
        f.storbinary('STOR ' + self.remotefile, fp, bufsize)
        fp.close()
        f.quit()

4.备份并定时清理文件

from filehelper import *
import datetime

sourcepath = "C:\\source"
destpath = "C:\\source\\backup"
searchstr = "aa"

FileHelper = FileHelper(sourcepath, searchstr)
sourcefilelist = FileHelper.get_sourcefile()

# 备份文件
for filename in sourcefilelist:
    destfilename = FileHelper.get_destfile(filename, destpath)
    datestr = datetime.date.today().strftime("%Y_%m_%d")
    if filename in datestr:
        FileHelper.copyfile(filename, destfilename)

# 删除文件
for filename in sourcefilelist:
    datestr = filename[13:23]
    filedate = datetime.datetime.strptime(datestr, "%Y_%m_%d")
    checkDate = datetime.date.today() - datetime.timedelta(days=10)
    if filedate <= checkDate:
        FileHelper.deletefile(filename)