Finding the difference between consecutive numbers in a list (Python)

Question

Given a list of numbers, I am trying to write a code that finds the difference between consecutive elements. For instance, A = [1, 10, 100, 50, 40] so the outp

Answer 1

You can do a list comprehension:

>>> A = [1, 10, 100, 50, 40]
>>> l=[A[0]]+A
>>> [abs(l[i-1]-l[i]) for i in range(1,len(l))]
[0, 9, 90, 50, 10]