Help with inverted dictionary

[Devan L]

import re
name = "Robert"
f = file('phonebook.txt','r')
lines = [line.rstrip("\n") for line in f.readlines()]
pat = re.compile(name, re.I)
related_lines = [line for line in lines if pat.search(line)]

And then you write the lines in related_lines to a file. I don't really
write text to files much so, um, yeah.