I would like to give some feedback about syntax error, that should not appear in line (if "POP" in i:)
def letter_queue(commands):
r = []
for i in commands:
if "PUSH" in i:
r.append(i.replace("PUSH ","")
if "POP" in i:
if len(r)>0:
r.pop(0)
return "".join(r)
From: http://www.checkio.org/mission/letter-queue/solve/
HTTP_USER_AGENT:
Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36
Created at: Oct. 30, 2015, 2:11 a.m.; Updated at: Oct. 30, 2015, 5:06 p.m.