Create TarFile using python

[itzel]

I have a problem. I'm new in python and I need a script that group a
list of files using Tar file utility and then, compress that block
using a compress utility (gzip i think). I already found some
information and i try to apply it,  but my scripy doesn't work. The
first problem is when I had tried to open the file that i want to
group, a IO error appear:

f = open(log, "r")
IOError: [Errno 13] Permission denied: 'C:\\path"

I previusly asigned to "log" the path of the archive that i want to
group....

could sombody helpme???.