human
Solve the following python programming problem given the following code:
def parse_names_files(zfile, N_names, end_year) : 
    def parse_state(string) : 
        data = defaultdict ((lambda : defaultdict (int))) 
        for line in string.strip ().split ('\r
') : 
            (state, gender, year, name, count) = line.split (',') 
            if ((gender.lower () == 'm') and (int (year) <= end_year)) : 
                data [name.lower ()] [int (year)] += int (count) 
return data 
def get_years(dct) : 
        sum = (lambda lst : reduce (operator.or_, lst)) 
        return sorted (sum ((set (dd.keys ()) for d in dct.values () for dd in d.values ()))) 
def get_top_names(dct, N_names) : 
        counts = defaultdict (int) 
        for statedict in dct.values () : 
            for (name, yeardict) in statedict.iteritems () : 
                counts [name] += sum (yeardict.values ()) 
return sorted (counts.keys (), key = counts.__getitem__, reverse = True) [: N_names] 
def get_data_array(dct, years, states, names) : 
        counts = np.zeros ((len (years), len (states), len (names))) 
        for (year_idx, year) in enumerate (years) : 
            for (state_idx, state) in enumerate (states) : 
                for (name_idx, name) in enumerate (names) : 
                    counts [(year_idx, state_idx, name_idx)] = dct [state] [name] [year] 
return counts 
keys = [key for key in zfile.namelist () if key.endswith ('.TXT')] 
    dct = { key [: 2] : parse_state (zfile.read (key)) for key in keys } 
    years = get_years (dct) 
    states = sorted (dct.keys ()) 
    names = get_top_names (dct, N_names) 
    data = get_data_array (dct, years, states, names) 
    return (end_year, years, states, names) 

    
    

    Fix the buggy line: return (end_year, years, states, names)
assistant
#Here is Python program to fix the buggy line: return (end_year, years, states, names)
.

return (data, years, states, names)