How can I capture the output from a shell command in Python?

What I need to do is the following: in a Python script spawn, say the ls --colors=always / Linux command, and read its output. The important part of this is that I need the output to keep all the ANSI escape sequences (colors and such) to later translate these sequences into H开发者_如何学编程TML. I heard that Python pty module can do that, but I could not find a useful example of its usage in the Internet, and this module's documentation is not quite comprehensive. I'll appreciate if someone could guide me through the way of accomplishing this task.

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import subprocess as sub

process = sub.Popen("ls --colors=always /", stdout=sub.PIPE, stderr=sub.PIPE)
output, errors = process.communicate()

Now all the data you want should be in output - including the ANSI escape sequences.