use only part of the data premutation

Question

import itertools

alphabet = {
    "A": 1,
    "B": 2,
    "C": 3,
    "D": 4,
    "E": 5,
    "F": 6,
    "G": 7,
    "H": 8,
    "I": 9,
    "J": 10,
    "K": 11,
    "L": 12,
    "M": 13,
    "N": 14,
    "O": 15,
    "P": 16,
    "Q": 17,
    "R": 18,
    "S": 19,
    "T": 20,
    "U": 21,
    "V": 22,
    "W": 23,
    "X": 24,
    "Y": 25,
    "Z": 26
}


def gen_combination_values(n):
    comb_values = {}
    for i in range(n + 1):
        for product in itertools.product(alphabet.keys(), repeat=i):
            prod = list(product)
            prod.sort()
            value = 0
            comb = ""
            for char in prod:
                value += alphabet[char]
                comb += char
            try:
                comb_values[value].add(comb)
            except KeyError:
                comb_values[value] = set()
                comb_values[value].add(comb)
    print(comb_values)
    return comb_values

I have this script and I would like to use only a part of the permutation how to do it?

I want the next part of the script to use only all results up to 10

{0: {''}, 1: {'A'}, 2: {'B', 'AA'}, 3: {'C', 'AB', 'BA'}, 4: {'BB' , 'AC', 'D', 'CA'}, 5: {'AD', 'BC', 'E', 'CB', 'DA'}, 6: {'F', 'CC', ' AE ',' DB ',' BD ',' EA '}, 7: {' CD ',' AF ',' G ',' EB ',' FA ',' BE ',' DC '}, 8: {'AG', 'CE', 'EC', 'H', 'BF', 'FB', 'DD', 'GA'}, 9: {'AH', 'DE', 'HA', ' BG ',' CF ',' ED ',' I ',' GB ',' FC '}, 10: {' EE ',' HB ',' DF ',' FD ',' IA ',' AI ' , 'J', 'BH', 'CG', 'GC'},

and the rest not to use

11: {'FE', 'BI', 'CH', 'AJ', 'JA', 'DG', 'GD', 'IB', 'HC', 'EF'}, 12: {'EG' , 'CI', 'IC', 'BJ', 'FF', 'DH', 'HD', 'JB', 'GE'}, 13: {'EH', 'HE', 'DI', ' CJ ',' FG ',' JC ',' ID ',' GF '}, 14: {' DJ ',' EI ',' IE ',' HF ',' JD ',' GG ',' FH ' }, 15: {'EJ', 'IF', 'GH', 'JE', 'FI', 'HG'}, 16: {'IG', 'JF', 'FJ', 'GI', ' HH '}, 17: {' JG ',' GJ ',' HI ',' IH '}, 18: {' JH ',' II ',' HJ '}, 19: {' IJ ',' JI ' }, 20: {'JJ'}}

how to achieve this? Basically here's the whole code I don't know what to do with all the attempts failed

I'm looking for only the first ten premutations to be used from the code

Answer 1

I suggest a re-write of your gen_combination_values() function. There are less cumbersome ways to build your dictionary (which I show in this code). You then need to construct a new dictionary to return which is based on your limit (which defaults to 10).

import itertools

ALPHABET = {k:i for i, k in enumerate('ABCDEFGHIJ', 1)}

def gen_combination_values(n, limit=10):
    comb_values = {}
    for i in range(n + 1):
        for product in itertools.product(ALPHABET, repeat=i):
            value = sum(ALPHABET[c] for c in product)
            comb = ''.join(c for c in product)
            comb_values.setdefault(value, set()).add(comb)
    return {k:v for k, v in comb_values.items() if k <= limit}

print(gen_combination_values(2))

Output:

{0: {''}, 1: {'A'}, 2: {'B', 'AA'}, 3: {'C', 'BA', 'AB'}, 4: {'D', 'AC', 'BB', 'CA'}, 5: {'DA', 'E', 'AD', 'BC', 'CB'}, 6: {'CC', 'AE', 'EA', 'BD', 'DB', 'F'}, 7: {'AF', 'FA', 'CD', 'BE', 'G', 'EB', 'DC'}, 8: {'AG', 'GA', 'CE', 'EC', 'FB', 'DD', 'H', 'BF'}, 9: {'CF', 'FC', 'AH', 'BG', 'ED', 'DE', 'GB', 'HA', 'I'}, 10: {'DF', 'EE', 'BH', 'IA', 'CG', 'AI', 'HB', 'GC', 'J', 'FD'}}