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]
-low=0
-bingo_num=20
-high=len(num_list)-1
-mid=(low+high)//2
-guess_num = num_list[mid]
-if guess_num==bingo_num:
-    print("找到了，它在列表索引是:",mid)
+import random
+alist=[]
+for i in range(1,101):
+    alist.append(i)
+num=random.choice(alist)
+def binary_search(alist,num):
+
+    low=0
     
     
-elif guess_num<bingo_num:
-      low=mid+1
-elif guess_num > bingo_num:
-    high = mid-1
-    
+    high=len(alist)-1
+    while low<=high:
+        mid=(low+high)//2
+        guess= alist[mid]
+        if guess == num:
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+            return mid
+        elif guess < num:
+            low=mid + 1
+        else:
+            high = mid-1
+    return None
+
+result = binary_search(alist,num)
+print("老师给的数是:",num)          
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