save project

my_search.py

@@ -6,4 +6,20 @@ for i in range(1, 101):
 num = random.choice(alist)
 # 请完善二分查找函数binary_search(),查找出num在列表alist里面的索引位置
 
-def binary_search(alist,num):
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+def binary_search(alist,num):
+    low=0
+    heig=len(alist)-1
+    while low <=heig:
+        c=(low+num)//2
+        d=alist[c]
+        if d==num:
+            return c
+        if d>num:
+            heig -=1
+        elif d<num:
+            low +=1
+    return None
+
+result=binary_search(alist,num)
+print("随机数是",num)
+print("随机数的索引是：",result)
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