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First solution in Uncategorized category for Letter Queue by arkadiusz.nadolski
def letter_queue(commands):
queue = []
result = ""
for i in commands:
if 'PUSH' in i:
queue += i[-1]
elif (i[1] == "O") and (len(queue)>0):
queue.pop(0)
return result.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"
Jan. 25, 2016
