Python Paramiko-Run命令

Question

我试着运行这个脚本：

hostname = '192.168.3.4'
port = 22
username = 'username'
password = 'mypassword'
y = "2012"
m = "02"
d = "27"

if __name__ == "__main__":
   s = paramiko.SSHClient()
   s.load_system_host_keys()
   s.connect(hostname, port, username, password)
   command = 'ls /home/user/images/cappi/03000/y/m/d'
   s.close

问题是： 如何将变量y、m、d放入变量command？

Answer 1

Python有很多方法来执行字符串格式化。最简单的方法之一是将字符串的各个部分连接在一起：

#!/usr/bin/env python
hostname = '192.168.3.4'    
port = 22
username = 'username'
password = 'mypassword'
y = "2012"
m = "02"
d = "27"

def do_it():
    s = paramiko.SSHClient()
    s.load_system_host_keys()
    s.connect(hostname, port, username, password)
    command = 'ls /home/user/images/cappi/03000/' + y + '/' + m + '/' + d
    (stdin, stdout, stderr) = s.exec_command(command)
    for line in stdout.readlines():
        print line
    s.close()

if __name__ == "main":
    do_it()

Answer 2

command = 'ls /home/user/images/cappi/03000/%s/%s/%s' %(y,m,d)

Answer 3

使用new format specifications，可以按名称访问参数：

'ls /home/user/images/cappi/03000/{year}/{month}/{day}'.format(year=y, month=m, day=d)