Added Binary Search

Author: Marcelo Andrade

Diff for: python/binary_search.py

@@ -0,0 +1,27 @@
+def binary_search(arr, low, high, x):
+ 
+    if high >= low:
+ 
+        mid = (high + low) // 2
+ 
+        if arr[mid] == x:
+            return mid
+ 
+        elif arr[mid] > x:
+            return binary_search(arr, low, mid - 1, x)
+ 
+        else:
+            return binary_search(arr, mid + 1, high, x)
+ 
+    else:
+        return -1
+ 
+arr = [ 2, 3, 4, 10, 40 ]
+x = 10
+ 
+result = binary_search(arr, 0, len(arr)-1, x)
+ 
+if result != -1:
+    print("Element is present at index", str(result))
+else:
+    print("Element is not present in array")