Query two arrays for the k-th largest

query_arrays.py

a = [1, 5, 10, 15]
b = [3, 6, 8,  20]

def query_arrays(a, b, k):
	i,j=0,0
	merged_array = []
	while i <= len(a)-1 and j <= len(b)-1:
		if a[i] < b[j]:
			merged_array.append(a[i])
			i += 1
		else:
			merged_array.append(b[j])
			j += 1

	print merged_array
	print merged_array[len(merged_array)-k]

query_arrays(a, b, 10)