def formula(individu, period, parameters): has_birth = individu.get_holder('date_naissance').get_known_periods() if not has_birth: has_age_en_mois = bool(individu.get_holder('age_en_mois').get_known_periods()) if has_age_en_mois: return individu('age_en_mois', period) // 12 # If age is known at the same day of another year, compute the new age from it. holder = individu.get_holder('age') start = period.start known_periods = holder.get_known_periods() if known_periods: for last_period in sorted(known_periods, reverse = True): last_start = last_period.start if last_start.day == start.day: last_array = holder.get_array(last_period) return ( last_array + int( start.year - last_start.year + (start.month - last_start.month) / 12 ) ) date_naissance = individu('date_naissance', period) epsilon = timedelta64(1) return (datetime64(period.start) - date_naissance + epsilon).astype('timedelta64[Y]')