human
Solve the following python programming problem given the following code:
def _diff_to_hdf(self, difflines, tabwidth) : 
    '
        Translate a diff file into something suitable for inclusion in HDF.
        The result is [(filename, revname_old, revname_new, changes)],
        where changes has the same format as the result of
        `trac.versioncontrol.diff.hdf_diff`.

        If the diff cannot be parsed, this method returns None.
        ' 
    def _markup_intraline_change(fromlines, tolines) : 
        from trac.versioncontrol.diff import get_change_extent 
        for i in xrange (len (fromlines)) : 
            (fr, to) = (fromlines [i], tolines [i]) 
            (start, end) = get_change_extent (fr, to) 
            if ((start != 0) or (end != 0)) : 
                last = (end + len (fr)) 
                fromlines [i] = ((((fr [: start] + '\x00') + fr [start : last]) + '\x01') + fr [last :]) 
                last = (end + len (to)) 
                tolines [i] = ((((to [: start] + '\x00') + to [start : last]) + '\x01') + to [last :]) 
import re 
    space_re = re.compile (' (+)|^ ') 
    def htmlify(match) : 
        (div, mod) = divmod (len (match.group (0)), 2) 
        return ((div * '&nbsp.
') + (mod * '&nbsp;')) 
comments = [] 
    changes = [] 
    lines = iter (difflines) 
    try : 
        line = lines.next () 
        while True : 
            oldpath = oldrev = newpath = newrev = '' 
            oldinfo = newinfo = [] 
            binary = False 
            if (not line.startswith ('--- ')) : 
                if ((not line.startswith ('Index: ')) and (line != ('=' * 67))) : 
                    comments.append (line) 
if (line == 'GIT binary patch') : 
                    binary = True 
                    diffcmd_line = comments [0] 
                    (oldpath, newpath) = diffcmd_line.split () [(- 2) :] 
                    if any ((c.startswith ('new file') for c in comments)) : 
                        oldpath = '/dev/null' 
if any ((c.startswith ('deleted file') for c in comments)) : 
                        newpath = '/dev/null' 
oldinfo = ['',...

    
    

    Fix the buggy line: common = ('(a) %s vs. (b) %s' % (c, newpath))
assistant
#Here is Python code to fix the buggy line: common = ('(a) %s vs.

common = ('(a) %s vs. (b) %s' % (oldpath, newpath))