Challenge - #57 - Collections.deque()
# Enter your code here. Read input from STDIN. Print output to STDOUT from collections import deque d = deque() for i in range ( int ( input ())): inp = input () if inp == "pop" : d.pop() elif inp == "popleft" : d.popleft() else : command , value = inp.split() value = int (value) if command == "append" : d.append(value) else : ...