Python有很多执行字符串格式化的方法。最简单的方法之一就是将字符串的各个部分简单地串联在一起：
#!/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()
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