import pexpect

class sshSession:
    def __init__(self, username, password, hostname, verbose=0, shell_promote='\$'):
        self.username = username
        self.password = password
        self.hostname = hostname
        self.child = None
        self.verbose = verbose
        self.shell_promote = shell_promote
        
    def connect(self):
        self.child = pexpect.spawn('ssh %s@%s' % (self.username,self.hostname))
        index = self.child.expect(['assword:','authenticity'])
        if index == 1:
            self.child.sendline('yes')
            self.child.expect('assword')
        self.child.sendline(self.password)
        index = self.child.expect(['please try again.',self.shell_promote])
        if index == 0:
            print 'wrong password'
            return
        elif index == 1:
            if self.verbose:
                print 'I am in'
    
    def exec_command(self,command):
        if not self.child:
            print 'please first connect'
            return
        self.child.sendline(command)
        self.child.readline()
        self.child.expect(self.username)
        result = self.child.before
        self.child.expect(self.shell_promote)
        return result
    def close(self):
        self.child.sendline('exit')
        self.child.expect(pexpect.EOF)
        if self.verbose:
            print 'quit'

foo = sshSession('username','password','someserverwithsshopen')
foo.connect()
print foo.exec_command('echo hello')
foo.close()