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260421 43.py

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+s="Hello"
+for char in s:
+    print(f"{char}的ASCII码是{ord(char)}")
+
+A=[3,4]
+B=[1,2]
+add_result=[A[i]+B[i]for i in range(len(A))]
+print("题目3-1 A+B结果:",add_result)
+mult_result=[2* x for x in A]
+print("题目3-2 2*A结果：",mult_result)
+import math
+a_length=math.sqrt(sum(x**2 for x in A))
+print("题目3-3 A的长度：",a_length)
+
+A1=[1,2,3]
+B1=[4,5,6]
+dot_product=sum(A1[i]*B1[i]for i in range(len(A1)))
+print("\n题目4-1 点积结果：",dot_product)
+a_len=math.sqrt(sum(x**2 for x in A1))
+b_len=math.sqrt(sum(x**2 for x in B1))
+cos_sim=dot_product/(a_len*b_len)
+print("题目4-2 余弦相似度:",cos_sim)
+A2=[1,0]
+B2=[0,1]
+dot2=sum(A2[i]*B2[i]for i in range(len(A2)))
+a2_len=math.sqrt(sum(x**2 for x in A2))
+b2_len=math.sqrt(sum(x**2 for x in B2))
+cos_sim2=dot2/(a2_len*b2_len)
+print("题目4-3 余弦相似度：",cos_sim2,",原因：两个向量正交（夹角90度)")