save project

my_search.py

-import random
-
-alist = []
-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
-
-def binary_search(alist,num):
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+p=20
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+def g(alist,num):
+    low = 0                        
+    high = len(alist)-1
+    while low <= high:
+        mid = (high+low)//2
+        gusse=alist[mid]
+        if gusse==num:
+            return mid
+            break
+        elif gusse<num:
+            low=mid+1
+        else:
+            high=mid-1
+    return None
+print(g(num_list,p))
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