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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
 # 使用二分查找法，找出9和20在列表里面的索引
+num = 20
+
 num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
 num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
 
 
+low = 0
+high = len(num_list)-1
+
 mid = (low + high)//2
 mid = (low + high)//2
-gusse = num_list(mid)
-if gusse == num:
-    print("找到了")
-elif gusse < num:
+guess = num_list[mid]
+if guess == num:
+    print("找到了",mid)
+elif guess < num:
     low = mid + 1
     low = mid + 1
 else:
 else:
     high = mid - 1
     high = mid - 1
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