import paramiko

remote_source = '<somedir>/file.py'
remote_destination = '<anotherdir>/file.py'
local_path = './file.py'
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect('<ip>',username='<username>',password='<password>')
ftp = ssh.open_sftp()
ftp.get(remote_source,local_path) #Download.This works
ftp.put(remote_destination,local_path) #Copy to server.
ftp.close()
ssh.close()