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]
+low=0
+le=len(num_list)-1
+while True:
+    if num_list[(low+le)//2]==3:
+        print((low+le)//2)
+        break
+    elif num_list[(low+le)//2]<3:
+        low=(low+le)//2+1
+    else :
+        le=(low+le)//2-1
+