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
 num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+num = 20
+low=0
+high=len(num_list)-1
+while True:
+    mid=(low+high)//2
+    guess=num_list[mid]
+    if num == guess:
+        print("找到了,索引为"+str(mid))
+        break
+    elif num < guess:
+        high = mid-1
+    else:
+        low = mid+1
+    if high<low:
+        print("没找到")
+        break
+    
+    
\ No newline at end of file