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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def older_message(m, lastm):
    '''return true if m is older than lastm by timestamp'''
    atts = {'time_boot_ms' : 1.0e-3,
            'time_unix_usec' : 1.0e-6,
            'time_usec' : 1.0e-6}
    for a in atts.keys():
        if hasattr(m, a):
            mul = atts[a]
            t1 = m.getattr(a) * mul
            t2 = lastm.getattr(a) * mul
            if t2 >= t1 and t2 - t1 < 60:
                return True
    return False