seq = []
def seq_enter():
val = raw_input("enter val:")
seq.append(val)
def seq_out():
if (len(seq) > 0):
return seq.pop(0)
else:
return None
def seq_show():
print seq
while(True):
cmd = raw_input("entr cmd:")
if(cmd == 'p'):
seq_enter()
elif(cmd == 'o'):
val = seq_out()
if(val != None):
print ("out val:%s" % val)
else:
print "seq is None"
elif(cmd == 's'):
val = seq_show()
else:
pass
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