save project

my_search.py

 import random
 import random
 
 
-alist = []
+numlist = []
 for i in range(1, 101):
 for i in range(1, 101):
-    alist.append(i)
-num = random.choice(alist)
+    numlist.append(i)
+num = random.choice(numlist)
 # 请完善二分查找函数binary_search(),查找出num在列表alist里面的索引位置
 # 请完善二分查找函数binary_search(),查找出num在列表alist里面的索引位置
 
 
-def binary_search(alist,num):
+def binary_search(alist,num):
\ No newline at end of file
+    low=0
+    high=len(numlist)-1
+    
+    while high>=low:
+        mid=(low+high)//2
+    
+        guess=alist[mid]
+        if guess==num:
+            return mid
+        elif guess<num:
+            low=mid+1
+            
+        else:
+            high=mid-1
+            
+    return None
+position=binary_search(numlist,num)
+print(str(num)+" "+str(position))
\ No newline at end of file