The use of universal_newlines in subprocess

[Joel Andres Granados]

Hi list:

I have been working with the universal_newlines option that can be 
specified while using the subprocess module.   I'm calling an app that 
uses sys.stdout.write('\r'+' '*80) to manage its stdout.  The situation 
that I encountered was that when I wanted to log this output into a file 
it looked rather freaky, so I needed to change the way the output was 
logged.  I found the answer in the universal_newlines option (it 
basically changed all the \r for \n, which is a good idea in my case).  
When I read the documentation for the universal_newline it stated that 
"Also, the newlines attribute of the file objects stdout, stdin and 
stderr are not updated by the communicate() method.".  So I did not use 
the communicate method thinking that it could not be used for my 
purpose.  After some hours of trying to make it work without the 
communicate method I decide to use it and to my surprise it worked.  So 
my question is what does " are not updated by the communicate() method " 
mean in the documentation.

Thanx in advance.


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