Python 操作FTP

import sys, os, ftplib, socket


CONST_HOST = "FTP服务器地址"
CONST_USERNAME = "FTP用户名"
CONST_PWD = "FTP密码"


CONST_BUFFER_SIZE = 8192


class FtpHelper(object):
    ftp = None

    def __init__(self):
        self.ftp = self.connect()

    def connect(self):
        try:
            ftp = ftplib.FTP(CONST_HOST)
            ftp.login(CONST_USERNAME, CONST_PWD)
            return ftp
        except socket.error, socket.gaierror:
            print("FTP is unavailable,please check the host,username and password!")
            sys.exit(0)

    def disconnect(self):
        self.ftp.quit()

    def upload(self, ftppath, filepath):
        f = open(filepath, "rb")
        self.ftp.cwd(ftppath)
        file_name = os.path.split(filepath)[-1]
        try:
            self.ftp.storbinary('STOR %s'%file_name, f, CONST_BUFFER_SIZE)
        except ftplib.error_perm:
            return False
        return True

    def download(self, ftppath, filename):
        f = open(filename, "wb").write
        self.ftp.cwd(ftppath)
        try:
            self.ftp.retrbinary("RETR %s"%filename, f, CONST_BUFFER_SIZE)
        except ftplib.error_perm:
            return False
        return True

    def list(self):
        self.ftp.dir()

    def find(self, ftppath, filename):
        self.ftp.cwd(ftppath)
        ftp_f_list = self.ftp.nlst()
        if filename in ftp_f_list:
            return True
        else:
            return False

if __name__ == "__main__":
    fh = FtpHelper()
    fh.list()