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binary_search.py

 # 使用二分查找法，找出9和20在列表里面的索引
+num=5
 num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
 low=0
-high=len(num_list)
-mid=(low+high)//2
-if 
\ No newline at end of file
+high=len(num_list)-1
+while low<=high:
+    mid=(low+high)//2
+    guess=num_list[mid]
+    if guess==num:
+        print("找到了,索引为",mid)
+        break
+    elif guess<num:
+        low=mid+1
+    elif guess>num:
+        high=mid-1