save project

binary_search1.py/binary_search1.py/binary_search1.py

+import random
+alist=[]
+for i in range(1,random.randint(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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