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]
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+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+num = 9
+low = 0
+high = len(num_list)-1
+mid = (low+high)//2
+if num_list[mid]==num:
+    print("找到了，它在列表里的索引为："+mid)
+elif num_list[mid]<num:
+    low = mid+1
+else:
+    high = mid-1
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