[python] python paramiko ssh

i'm new on python. i wrote a script to connect to a host and execute one command

ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect(host, username=user, password=pw)

print 'running remote command'

stdin, stdout, stderr = ssh.exec_command(command)
stdin.close()

for line in stdout.read().splitlines():
    print '%s$: %s' % (host, line)
    if outfile != None:
        f_outfile.write("%s\n" %line)

for line in stderr.read().splitlines():
    print '%s$: %s' % (host, line + "\n")
    if outfile != None:
        f_outfile.write("%s\n" %line)

ssh.close()

if outfile != None:
    f_outfile.close()

print 'connection to %s closed' %host

except:
   e = sys.exc_info()[1]
   print '%s' %e

works fine when then remote command doesn't need a tty. i found an invoke_shell example Nested SSH session with Paramiko. i'm not happy with this solution, because if a server has an prompt that isn't specified in my script -> infinite loop or a specified prompt in the script is a string in the return text -> not all data will be received. is there a better solution maybe where stdout and stderr are send back like in my script?

The code of @ThePracticalOne is great for showing the usage except for one thing: Somtimes the output would be incomplete.(session.recv_ready() turns true after the if session.recv_ready(): while session.recv_stderr_ready() and session.exit_status_ready() turned true before entering next loop)

so my thinking is to retrieving the data when it is ready to exit the session.

while True:
if session.exit_status_ready():
while True:
    while True:
        print "try to recv stdout..."
        ret = session.recv(nbytes)
        if len(ret) == 0:
            break
        stdout_data.append(ret)

    while True:
        print "try to recv stderr..."
        ret = session.recv_stderr(nbytes)
        if len(ret) == 0:
            break
        stderr_data.append(ret)
    break

There is something wrong with the accepted answer, it sometimes (randomly) brings a clipped response from server. I do not know why, I did not investigate the faulty cause of the accepted answer because this code worked perfectly for me:

import paramiko

ip='server ip'
port=22
username='username'
password='password'

cmd='some useful command' 

ssh=paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect(ip,port,username,password)

stdin,stdout,stderr=ssh.exec_command(cmd)
outlines=stdout.readlines()
resp=''.join(outlines)
print(resp)

stdin,stdout,stderr=ssh.exec_command('some really useful command')
outlines=stdout.readlines()
resp=''.join(outlines)
print(resp)

###### Use paramiko to connect to LINUX platform############
import paramiko

ip='server ip'
port=22
username='username'
password='password'
ssh=paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect(ip,port,username,password)

--------Connection Established-----------------------------

######To run shell commands on remote connection###########
import paramiko

ip='server ip'
port=22
username='username'
password='password'
ssh=paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect(ip,port,username,password)


stdin,stdout,stderr=ssh.exec_command(cmd)
outlines=stdout.readlines()
resp=''.join(outlines)
print(resp) # Output