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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_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+a = 9
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+b = 0
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+c = (a+b)//2
+d = num_list[c]
+while True:
+    if d == 20:
+        print("找到了")
+        break
+    elif d <20:
+        b = b+1
+    else:
+        a = a-1
+    d = num_list[(a+b)//2]
+    
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