python定义一个类实例作为ftp回调方法

"""
皮蛋编程(https://www.pidancode.com)
创建日期：2022/4/3
功能描述：
"""


class Writer:
    def __init__(self, file):
        self.f = open(file, "w")

    def __call__(self, data):
        self.f.write(data)
        self.f.write('\n')
        print(data)


FILENAME = "AutoIndent.py"
writer = Writer(FILENAME)
import ftplib

ftp = ftplib.FTP('127.0.0.1', 'book', 'bookpw')
ftp.retrlines("RETR %s" % FILENAME, writer)