save project

11.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
+        elif guess > num:
+            high = mid-1
+    return None
+result = binary_search(alist,num)
+print("给的数",num)
+print("在列表里的索引是",result)
+        
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