Gen 3-6 IV/EV Calculator

from numpy import *
possible_IVs = arange(32)
possible_EVs = arange(64)
combo_matrix = add.outer(possible_IVs, possible_EVs)
stat_names = ["HP", "Attack", "Defense", "SpAtk", "SpDef", "Speed"]

def CalcIVsFromStats(stats, base_stats, level, nature):
    # HP, Atk, Def, Spa, Spd, Spe
    # Nature: tuple (up_idx, dn_idx)
    for stat_idx, stat_value in enumerate(stats):
        cur_stat = (base_stats[stat_idx] * 2 + combo_matrix) * level / 100
        if not stat_idx:
            cur_stat += level + 10
        else:
            cur_stat += 5
            if stat_idx == nature[0]:
                cur_stat *= 11
                cur_stat /= 10
            elif stat_idx == nature[1]:
                cur_stat *= 9
                cur_stat /= 10
        putative_IVs, putative_EVs = where(cur_stat == stat_value)
        print "Possible IV/EV combos for %s" % stat_names[stat_idx]
        for EV_idx, IV_val in enumerate(putative_IVs):
            cur_EV = 4 * putative_EVs[EV_idx]
            print "IV: {:>2d}, EV: {:>3d} - {:>3d}".format(
                    IV_val, cur_EV, cur_EV + 3
                    )
        print "-------------------------------------------"