add python script binary-search in data-structures

data-structures/binarySerach.py

@@ -0,0 +1,25 @@
+def binSearch(a, x, low, high):
+   #Return True if target is found in indicated portion of a Python list.
+   #The search only considers the portion from data[low] to data[high] inclusive.
+
+ if low > high:
+     return False # interval is empty; no match
+ else:
+     mid = (low + high) // 2
+     if x == a[mid]: # found a match
+        return True
+     elif x < a[mid]:
+        # recur on the portion left of the middle
+        return binSearch(a, x, low, mid - 1)
+     else:
+        # recur on the portion right of the middle
+        return binSearch(a, x, mid + 1, high)
+a = [5, 10, 15, 20, 25, 30, 40]
+x = 20
+low = 0
+high = 6
+result = binSearch(a, x, low, high)
+if result:
+    print("The value ", x, " Found")
+else:
+    print("The value ", x, " Not found")