Merge pull request darkprinx#27 from ulmasovjafarbek/patch-2

Binary Search solution

Author: darkprinx

Status/Day_17.md

@@ -125,7 +125,26 @@ print bin_search(li,12)
 #to be written
 
 ```
-
+**Solution by ulmasovjafarbek: Python 3**
+```python
+def binary_search(lst, item):
+ low = 0
+ high = len(lst) - 1
+ 
+ while low <= high:
+ mid = round((low + high) / 2)
+ 
+ if lst[mid] == item:
+ return mid
+ elif lst[mid] > item:
+ high = mid - 1
+ else:
+ low = mid + 1
+ return None
+ 
+lst = [1,3,5,7,]
+print(binary_search(lst, 9)) 
+```
 ---
 
 **Solution by AasaiAlangaram: Python 3**