save project

binary_search.py

 # 使用二分查找法，找出9和20在列表里面的索引
 # 使用二分查找法，找出9和20在列表里面的索引
-num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+num_9=9
\ No newline at end of file
+num_20=20
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+while low<=high:
+    mif=(low+high)//2
+    guess_num=num_list[mid]
+    if guess_num==num_20:
+        print(mid)
+        break
+    elif guess_num<num_20:
+        low=mid+1
+    elif guess_num>num_20:
+        high=mid-1
+    else:
+        print("这个数不在这个列表")
\ No newline at end of file