计算具有特定值的元素在不同列中的出现次数

def count_occurrences(dataset, value):
    occurrences = {}  # 用于存储特定值的出现次数的字典

    # 遍历每一列
    for col_index in range(len(dataset[0])):
        count = 0  # 特定值的出现次数

        # 遍历每一行
        for row in dataset:
            if row[col_index] == value:
                count += 1

        occurrences[col_index] = count

    return occurrences

# 示例数据集
dataset = [
    [1, 2, 3, 4],
    [1, 2, 3, 4],
    [1, 2, 3, 5],
    [1, 2, 4, 4],
]

# 统计值为 4 在每一列中的出现次数
occurrences = count_occurrences(dataset, 4)

# 打印结果
for col_index, count in occurrences.items():
    print(f"在第 {col_index+1} 列中，值为 4 的出现次数为 {count} 次。")