Subtract a value from every number in a list in Python?

Question

I have a list

 a = [49, 51, 53, 56]

How do I subtract 13 from each integer value in the list?

Answer 1

To clarify an already posted solution due to questions in the comments

import numpy

array = numpy.array([49, 51, 53, 56])
array = array - 13

will output:

array([36, 38, 40, 43])