feat: - vector

counter.py

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+from collections import Counter, defaultdict
+
+words = ["apple", "banana", "apple", "orange", "banana", "apple"]
+# 统计每个单词出现的次数
+
+word_counter = Counter(words)
+print(word_counter)  # Counter({'apple': 3, 'banana': 2, 'orange': 1})
+
+# 获取出现次数最多的2个单词
+max_word = word_counter.most_common(2)
+print(max_word)  # [('apple', 3), ('banana', 2)]
+
+# 合并
+merged = Counter(["a", "b", "c"]) + Counter(["a", "c"])
+print(merged)  # Counter({'a': 2, 'c': 2, 'b': 1})
+
+
+# 创建一个以list为默认值的字典
+
+list_dict = defaultdict(list)
+list_dict["fruite"].append("apple")
+list_dict["fruite"].append("banner")
+print(list_dict)
+
+
+count_dict = defaultdict(int)
+for word in ["apple", "banana", "apple", "orange", "banana", "apple"]:
+    count_dict[word] += 1
+print(count_dict)