连接到sftp服务器的python代码

我发现这段代码可以通过用户名、密码和主机连接到远程sftp服务器，但我还需要包括端口号，任何人都可以让em知道如何在这段代码和这段代码中包括端口号吗 'parmiko.util.log_to_文件（log_文件名）'log_文件名的硬代码应该是什么？？ 我在unix环境中运行此代码

import os
import paramiko
server, username, password = ('host', 'username', 'password')   
ssh = paramiko.SSHClient()  
parmiko.util.log_to_file(log_filename)    
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())

' #In case the server's key is unknown,'
#we will be adding it automatically to the list of known hosts 
ssh.load_host_keys(os.path.expanduser(os.path.join("~", ".ssh", "known_hosts")))   

#Loads the user's local known host file  
ssh.connect(server, username=username, password=password) 
ssh_stdin, ssh_stdout, ssh_stderr = ssh.exec_command('ls /tmp') 

print "output", ssh_stdout.read() #Reading output of the executed co'mmand 
error = ssh_stderr.read()  

#Reading the error stream of the executed command
print "err", error, len(error) 

#Transfering files to and from the remote machine' 
sftp = ssh.open_sftp()   
'sftp.get(remote_path, local_path)'
sftp.put(local_path, remote_path) 
sftp.close()
ssh.close()

---

ssh.connect（）方法有一个

port=

命名参数。见

例如：

ssh.connect(server, port=portnumber, username=username, password=password)

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比我早一秒到达：P+1