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XWL.py

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+print(" 题目1")
+s = "Hello"
+for c in s:
+    print(f"'{c}' 的ASCII码: {ord(c)}")
+print(f"ASCII码65对应的字符: {chr(65)}")
+import math
+print("题目3 ")
+A = [3, 4]
+B = [1, 2]
+A_plus_B = [A[0] + B[0], A[1] + B[1]]
+print("A + B =", A_plus_B)
+two_times_A = [2 * A[0], 2 * A[1]]
+print("2 × A =", two_times_A)
+A_norm = math.sqrt(A[0] ** 2 + A[1] ** 2)
+print("A 的模 =", A_norm)
+print(" 题目4 ")
+A = [1, 2, 3]
+B = [4, 5, 6]
+dot_product = sum(a * b for a, b in zip(A, B))
+print("A·B =", dot_product)
+def vector_norm(v):
+    return math.sqrt(sum(x ** 2 for x in v))
+norm_A = vector_norm(A)
+norm_B = vector_norm(B)
+cos_sim = dot_product / (norm_A * norm_B)
+print("余弦相似度 =", cos_sim)
+A_new = [1, 0]
+B_new = [0, 1]
+dot_product_new = sum(a * b for a, b in zip(A_new, B_new))
+norm_A_new = vector_norm(A_new)
+norm_B_new = vector_norm(B_new)
+cos_sim_new = dot_product_new / (norm_A_new * norm_B_new)
+print("A=[1,0], B=[0,1] 的余弦相似度 =", cos_sim_new)
+print("原因：两个向量正交,点积为0,因此余弦相似度为0")