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]
+low,high,num = 0,len(num_list),20
+while low < high:
+    mid = (low+high) // 2
+    guess = num_list[mid]
+    if guess == num:
+        print("找到了")
+        print(mid)
+        break
+    elif guess < num:
+        low = mid + 1
+    elif high <low:
+        print("找到了")
+        print(mid)
+        break
+    else:
+        high = mid-1
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