save project

my_search.py

 import random
 import random
 
 
-alist = []
+abab = []
 for i in range(1, 101):
 for i in range(1, 101):
-    alist.append(i)
-num = random.choice(alist)
-# 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
+    abab.append(i)
+num = random.choice(abab)
 
 
-def binary_search(alist,num):
+def binary_search(abab,num):
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+    low=0
+    high=len(abab)-1
+    while high>low:
+        mid=(low+high)//2
+        if num==abab[mid]:
+            return mid
+        elif abab[mid]>num:
+            high=abab[mid]-1
+        else:
+            low=abab[mid]+1
+    return None
+reslut=binary_search(abab,num)
+print(num,reslut)
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