有没有办法在用户登录后立即更改pyftpdlib的工作目录

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

class MyFTPHandler(FTPHandler):
    def on_login(self, username):
        # 在用户登录后执行的操作
        self.cwd('/new/directory/path')  # 设置新的工作目录

def main():
    authorizer = DummyAuthorizer()
    authorizer.add_user('username', 'password', '/home/user', perm='elradfmwMT')
    
    handler = MyFTPHandler
    handler.authorizer = authorizer
    
    server = FTPServer(('0.0.0.0', 21), handler)
    server.serve_forever()