Populate dict from bzipped log file

bzip.py

def populate(file, result):
    '''
    Read bzipped syslog and match re below, append to dict referred to
    by result.
    
    Requires re and bz2
    '''
    
    f = BZ2File(file, 'r')
    re_aide = re.compile('^\w+ \d+ \d\d:\d\d:\d\d ([\w\-\.]+) aide: (.*)$')
    while 1:
        lines = f.readlines(8192)

        if not lines:
            break

        for line in lines:
            m = re_aide.match(line)
            if m:
                s, d = m.group(1), m.group(2)
                if s not in result or not isinstance(result[s], list):
                    result[m.group(1)] = []
                result[s].append(d)