save project

my_search.py

@@ -3,7 +3,22 @@ import random
 alist = []
 alist = []
 for i in range(1, 101):
 for i in range(1, 101):
     alist.append(i)
     alist.append(i)
-num = random.choice(alist)
+b=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
 # 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):
+def binary_search(alist,b):
\ No newline at end of file
+    low=0
+    high=len(alist)-1
+    while True:
+        mid=(low+high)//2
+        g=alist[mid]
+        if g==b:
+            return mid
+        elif g<b:
+            low =mid+1
+        elif g>b:
+            high=mid-1
+    return None
+print('數是：',b)
+result= binary_search(alist,b)
+print('位置是：',result)