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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
+high=len(num_list)-1
+
+while True:
+    mid=(low+high)//2
+    if num_list[mid]==9 or (low==high and num_list[mid]==9):
+        print('找到了')
+        break
+    elif high<low:
+        print('没有这个数')
+        break
+        
+    elif num_list[mid]<9:
+        low=mid+1
+    else:
+        high=mid-1
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