Problems with scp script in Python

[Joaquin Alzola]

>I have an SCP script that auto completes just fine from the terminal window in Pi.  When I use either subprocess or os to try and have it run under Python it does not do the file >transfer from Pi to my Ubuntu machine.  What am I doing wrong?  Here is the script:

>from subprocess import call
>cmd='scp -i id_rsa sample.txt jack at 192.168.1.103 /home/jack/pi_data'
>call (cmd.split ())

Do it manually first and check that it is working.
Then if you will not expect any output:

os.system(''scp -i id_rsa sample.txt jack at 192.168.1.103:/home/jack/pi_data')

I put a colon as well when I copy to a specific directory.
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