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
 # 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]
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
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+
+def erfen(n,list):
+    num_list=list    
+    num=n
+    low=0
+    high=len(num_list)-1
+
+    while low <=high:
+        mid = (low+high)//2
+        guess = num_list[mid]
+        if guess == num:
+            print('查到了，它的索引值为：',mid)
+            return
+        elif guess < num:
+            low=mid+1
+        else:
+            high=mid-1
+    print('你查的数字不在')
+erfen(80,num_list)
+
+        
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