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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]
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+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21,36,85,195,789]
+num = 85
+low = 0
+hight = len(num_list)-1
+
+while True:
+    mid = (low+hight) //2
+    if num_list[mid] == num:
+        print("找到了"+str(num)+"的索引值为"+str(mid))
+        break
+    elif num_list[mid]> num:
+        hight = mid -1 
+    elif num_list[mid]< num:
+        low = mid +1 
+
+     
+        
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