documents=[
    "Python是编程语言",
    "Java是编程语言",
    "Python Python Python"
]
word_list=[]
for doc in documents:
    words=doc.split()
    for word in words:
        if word not in word_list:
            word_list.append(word)
vocab=sorted(word_list)
print("词变：",vocab)
bow_vectors=[]
for doc in documents:
    words=doc.split()
    vector=[words.count(word) for word in vocab]
    bow_vectors.append(vector)
for i,vec in enumerate(bow_vectors):
    print(f"Doc{i+1}的向量表示:{vec}")

#两个缺点：忽略词序与语义关系
         #词汇维度爆炸与稀疏性