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260423 43.py

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+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