python - For 循环更新字典值但不影响输出

Question

我试图迭代文件中的句子，选择“最佳”句子(这是具有最多稀有双音素(声音)数量的句子)，并在选择句子后，更改 的字典值句子中的每个双音素都为 0，这样就不会再次选择双音素(因为我想确保每个可能的双音素都已被选择)。

我已经为此编写了代码，但不明白为什么它不影响输出，因为当我检查在 for 循环开始时选取的字典键之一的值时，它已设置为0.我的代码是:

diphone_frequencies = {...}
diphone_frequencies_original = copy.deepcopy(diphone_frequencies)

line_score = {}
best_utts = []

for i in range(650):
    # Open the file and put all its lines in a list. Once.
    with open('recipe_diphone_utts.txt') as file:

        # Read the file lines one by one.
        for line in file:
            line = line.rstrip('\r\n')
            if line in best_utts:
                continue # Skip previously picked sentences.
            score = 0.0
            # Add a score to the line depending on its content.
            for word in line.split():
                score += float(diphone_frequencies[word])
            line_score[line] = score/len(line.split())

        # Sort each lines based on their score and get the best.
        best_sentence = max(line_score.keys(), key=(lambda k: line_score[k]))
        best_utts.append(best_sentence)
        print(best_sentence)

        # Each unique word of this iteration's best sentence has its score set to 0.
        for item in set(best_sentence.split()):
            diphone_frequencies[item] = 0

        if all(value == 0 for value in diphone_frequencies.values()):
            diphone_frequencies = diphone_frequencies_original

编辑:这个问题已经解决了，但是我现在不能接受我自己的答案；问题是打开文档后出现 for 循环；当我放置时代码有效

for i in range(600):

之前

with open('recipe_diphone_utts.txt') as file:

编辑2:

面临的主要问题已经解决，我已经更改了代码，但是行:

if line in best_utts:
    continue

应该确保在重置字典值后不会再次选择同一行的多个实例，但是它会导致同一个句子一遍又一遍地被选为最佳句子，所以我需要其他方法来防止同一句话被多次选择。

Answer 1

由于外部循环，目前 best_utts == [best_sentence] * 600 ，与所有其他句子(行)相比，best_sentence 是得分最高的句子)的文件。

要获得 600 个最佳句子，我会这样做:

diphone_frequencies = {...}
diphone_frequencies_original = copy.deepcopy(diphone_frequencies)

line_score = {}
best_utts = []

# Open the file and put all its lines in a list. Once. 
with open('recipe_diphone_utts.txt') as file:
    all_lines = file.readlines()

for i in range(600):
    print(diphone_frequencies['f_@@r'])

    # Read the file lines one by one.
    for line in all_lines:
        line = line.rstrip()
        if line in best_utts:
            line_score[line] = 0
            continue # Skip previously picked sentences.
        score = 0.0
        # Add a score to the line depending on its content.
        for word in line.split():
            score += float(diphone_frequencies[word])
        line_score[line] = score/len(line.split())

    # Sort each lines based on their score and get the best.
    best_sentence = max(line_score.keys(), key=(lambda k: line_score[k]))
    best_utts.append(best_sentence)

    # Each unique word of this iteration's best sentence has its score set to 0.
    for item in set(best_sentence.split()):
        diphone_frequencies[item] = 0

    if all(value == 0 for value in diphone_frequencies.values()):
        diphone_frequencies = diphone_frequencies_original

print(best_utts)

最后也不需要 file.close() 因为您使用的是 with open ... as file 而不是 file = open(. ..)。