save project

my_search.py

@@ -7,3 +7,18 @@ 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):
+    l=0
+    h=len(alist)-1
+    while l<=h:
+        m=(l+h)//2
+        g=alist[m]
+        if g==bg:
+            return m
+        elif g<bg:
+            l=m+1
+        elif g>bg:
+            h=m-1
+    return num
+a=binary_search(alist,num)
+print("老师给的数是：",num)
+print("他在列表里的索引是",a)
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