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First solution in Uncategorized category for Letter Queue by adrian.wawrzak
from collections import deque
def letter_queue(commands):
queue = deque([])
for command in commands:
if command == 'POP' and queue:
queue.popleft()
c = command.split()
if c[0] == "PUSH":
queue.append(c[1])
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"
Nov. 16, 2015
