human
Solve the following python programming problem given the following code:
def approximate_age(self, from_stamp, to_stamp = None, precision = 2) : 
    'Calculate the relative time from given timestamp to another given (epoch) or now.' 
    if (to_stamp is None) : 
        to_stamp = time.time () 
rem = (to_stamp - from_stamp) 
    def divide(rem, mod) : 
        return ((rem % mod), int ((rem // mod))) 
def subtract(rem, div) : 
        n = int ((rem // div)) 
        return (n, (rem - (n * div))) 
(seconds, rem) = divide (rem, 60) 
    (minutes, rem) = divide (rem, 60) 
    (hours, days) = divide (rem, 24) 
    (years, days) = subtract (days, 365) 
    (months, days) = subtract (days, 30) 
    (weeks, days) = subtract (days, 7) 
    magnitudes = [] 
    first = None 
    values = locals () 
    for (i, magnitude) in enumerate (('years', 'months', 'weeks', 'days', 'hours', 'minutes', 'seconds')) : 
        v = int (values [magnitude]) 
        if (v == 0) : 
            continue 
s = ('%s %s' % (v, magnitude)) 
        if (v == 1) : 
            s = s [: (- 1)] 
if (first is None) : 
            first = i 
else : 
            if ((first + precision) <= i) : 
                break 
magnitudes.append (s) 
return ', '.join (weeks) 

    
    

    Fix the buggy line: return ', '.join (weeks)
assistant
#Here is Python code to fix the buggy line: return ', '.

return ', '.join (magnitudes)