About
lists are not efficient when implementing a queue (FIFO logic). While appends and pops from the end of list are fast, doing inserts or pops from the beginning of a list is slow (because all of the other elements have to be shifted by one).
To implement a queue , use
collections.dequewhich was designed to have fast appends and pops from both ends.
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Example
from collections import deque
queue = deque(["Eric", "John", "Michael"])
queue.append("Terry") # Terry arrives
queue.append("Graham") # Graham arrives
queue.popleft() # The first to arrive now leaves
'Eric'
queue.popleft() # The second to arrive now leaves
'John'
queue # Remaining queue in order of arrival
deque(['Michael', 'Terry', 'Graham'])