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queue = deque() solution in Clear category for Letter Queue by Ilis
def letter_queue(commands):
from collections import deque
queue = deque()
for command in commands:
if command.startswith("POP") and queue:
queue.popleft()
if command.startswith("PUSH"):
queue.append(command[5])
return "".join(queue)
if __name__ == '__main__':
# These "asserts" using only for self-checking and not necessary for auto-testing
assert letter_queue(["PUSH A", "POP", "POP", "PUSH Z", "PUSH D", "PUSH O", "POP", "PUSH T"]) == "DOT", "dot example"
assert letter_queue(["POP", "POP"]) == "", "Pop, Pop, empty"
assert letter_queue(["PUSH H", "PUSH I"]) == "HI", "Hi!"
assert letter_queue([]) == "", "Nothing"
May 23, 2019
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