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=20
+low=0
+high=len(num_list)-1
+while True:
+    mid=(low+high)//2
+    guess=num_list[mid]
+
+    if num==guess:
+        print("找到了,是",mid)
+        exit()
+    elif guess>num:
+        high = mid-1
+    else:
+        low = mid+1
+print("没有这个数")
+
+
+
+    
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