import paramiko
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect('x.x.x.x', username='user', password='password')
stdin, stdout, stderr = ssh.exec_command('pwd')
print stdout.read()
stdin, stdout, stderr = ssh.exec_command('sudo -i ')
stdin.write('passwordn')
stdin, stdout, stderr = ssh.exec_command('pwd')
print stdout.read()