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Explique o código:
def loot_prob(mapping, none_value=None, random_fn=None, _full_ret=False):
    if not random_fn:
        import random
        random_fn = random.random
    pcts = list(mapping.values())
    total_pct = sum(pcts)
    none_pct = 0.0
    if total_pct > 1.0:
        max_pct = sum(pcts)
        for k, v in mapping.items():
            mapping[k] = v/total_pct
    elif total_pct < 1.0:
        none_pct = 1.0 - total_pct
    last_pct = 0.0
    drop_line = {}
    for k, v in sorted(mapping.items(), key = lambda x: x[1]):
        drop_line[k] = (last_pct, last_pct+v)
        last_pct = last_pct+v
    if none_pct:
        drop_line[none_value] = (last_pct, 1.0)
    _do_return = lambda *args: args if _full_ret else args[0]
    rnd = random_fn()
    for k, (a, b) in drop_line.items():
        if a <= rnd < b:
            return _do_return(k, a, b, rnd)
    return _do_return(none_value, a, b, rnd)
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