Added binary search in searching techniques

Python/Searching_Techniques/Binary_Search/binary_search.py

@@ -0,0 +1,34 @@
+# Binary Search in python
+
+def binary(arr,low,high,key):
+    # It will run the loop while startIndex is less than or equal to endIndex
+    while(low<=high):
+        mid=(low+high)//2
+
+        if(arr[mid]==key):
+            print(arr[mid],"<- Found!!", "at index",mid)
+            # If value of element is equal to the array at middleIndex then return that index
+            break  
+
+        elif(key not in arr):
+            print("Not found")
+            break
+
+        # If the value of key is less than value of the array at middleIndex then decrease high by mid-1   
+        elif(arr[mid]>key): 
+            high=mid-1
+
+        else:
+            # Else store the value of low as mid+1
+            low=mid+1
+
+
+# Driver for the above code           
+arr=[2,3,4,10,40]
+x=10
+# Calling binary search funtion
+binary(arr,0,len(arr)-1,x) 
+
+# Output
+# 10 <- Found!! at index 3
+