auto save

qwertyuiop.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
+    else:
+        high=mid-1
+    return None
+result=binary_search(alist,nom)
+print("老师给的数是:",num)
+print("它在列表里的索引是:",result)
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