removing characters before writing to file

[eight02645999 at yahoo.com]

hi
i have some output that returns a lines of tuples eg

('sometext1', 1421248118, 1, 'P ')
('sometext2', 1421248338, 2, 'S ')
and so on
....

I tried this
re.sub(r" '() ",'',str(output)) but it only get rid of the ' and not
the braces. I need to write the output to a file such that

sometext1, 1421248118, 1, P
sometext2, 1421248338, 2, S

I also tried escaping , re.sub(r" '\(\) ",'',str(output)) but also did
not work
How can i get rid of the braces before writing to file? thanks