Serve some customers

arrivals is a list of names in arrival order. Write remaining(arrivals, n) that serves the first n customers from a deque and returns a list of who is still waiting. If n is more than the number of customers, nobody is left. Leave arrivals itself unchanged.

remaining(["Ada", "Grace", "Linus"], 2)  ->  ["Linus"]
remaining(["Ada"], 5)                    ->  []

from collections import deque

def remaining(arrivals, n):
    ...