How to get 'od' run?

[fl]

Hi,

I am learning python. I see a previous post has such code:





   >>> data = '"binääridataa"\n'.encode('utf-8') 
   >>> f = open('roska.txt', 'wb') 
   >>> f.write(data) 
   17 
   >>> f.close() 

The .encode methods produced a bytestring, which Python likes to display 
as ASCII characters where it can and in hexadecimal where it cannot: 

   >>> data 
   b'"bin\xc3\xa4\xc3\xa4ridataa"\n' 

An "octal dump" in characters (where ASCII, otherwise apparently octal) 
and the corresponding hexadecimal shows that it is, indeed, these bytes 
that ended up in the file: 

$ od -t cx1 roska.txt 


When I run the above line with python 2.7, it does not recognize 'od'.

Is it from a package? Or some internal function?

Thanks,