save project

binary_search.py

@@ -12,4 +12,6 @@ while low<= high:
     elif guess_num < bingo_num:
         low = mid+1
     elif guess_num > bingo_num:
-        high = mid-1    
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+        high = mid-1
+        
+            
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di2.py/di2.py

+import random
+
+alist = []
+for i in range(1,101):
+    alist.append(i)
+num = random.choice(alist)
+
+def binary_search(alist,num):
+    low = 0
+    high = len(alist)-1
+    while low <= high:
+        mid = (low + high) //2
+        guess = alist[mid]
+        if guess == num:
+            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)
+print("它在列表里的索引是：",result)                    
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