Python pyftpdlib运行，但不运行'；t似乎正在监听端口，但其他ftp服务器应用程序仍在工作

我正在尝试在Windows上构建一个运行Python的ftp服务器。我使用了

pyftpdlib

的基本示例，如下所示

import os
from pyftpdlib.authorizers import DummyAuthorizer
from pyftpdlib.handlers import FTPHandler
from pyftpdlib.servers import FTPServer

def main():
    # Instantiate a dummy authorizer for managing 'virtual' users
    authorizer = DummyAuthorizer()

    # Define a new user having full r/w permissions and a read-only
    # anonymous user
    authorizer.add_user('user', '12345', "c:\\temp", perm='elradfmwM')
    authorizer.add_anonymous(os.getcwd())

    # Instantiate FTP handler class
    handler = FTPHandler
    handler.authorizer = authorizer

    # Define a customized banner (string returned when client connects)
    handler.banner = "pyftpdlib based ftpd ready."

    # Specify a masquerade address and the range of ports to use for
    # passive connections.  Decomment in case you're behind a NAT.
    #handler.masquerade_address = '151.25.42.11'
    #handler.passive_ports = range(60000, 65535)

    # Instantiate FTP server class and listen on 0.0.0.0:2121
    address = ('', 21)
    server = FTPServer(address, handler)

    # set a limit for connections
    server.max_cons = 256
    server.max_cons_per_ip = 5

    # start ftp server
    server.serve_forever()

if __name__ == '__main__':
    main()

当它运行/执行时，它似乎在等待，没有其他东西在使用端口21。请参见下面的流程输出

---

[I 2017-04-17 19:05:55]>>在以下位置启动FTP服务器：21，pid=43124可能是因为它正在侦听IPv6地址。尝试更改此选项：

address = ('', 21)

为此：

address = ('0.0.0.0', 21)

“哦，我的天哪，贝基……”对不起，我的先生引用了一段混搭的话：）。该死的，就是这样我忘了IPv6谢谢