save project

my_search.py

@@ -7,3 +7,19 @@ 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 True:
+        c=(l+h)//2
+        if alist[c-1]<num:
+            l=c+1
+        else:
+            h=c-1
+        if alist[c]==num:
+            
+            return c
+        elif h<l:
+            return None
+print(num)
+g=binary_search(alist,num)
+print(g)
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