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queue = []
def enQ():
queue.append(raw_input('Enter new string:').strip())
def deQ():
if len(queue) == 0:
print 'Can not pop from an empty queue'
else:
print 'Removed [',queue.pop(0),']'
def viewQ():
print queue
CMDS = {'e':enQ,'d':deQ,'v':viewQ}
def showMenu():
pr = '''
(E)nqueue
(D)equeue
(V)iewqueue
(Q)uit
Enter choice:
'''
while True:
while True:
try:
choice = raw_input(pr).strip()[0].lower()
except(EOFError,KeyboardInterrupt,IndexError):
choice = q
print '\n You Picked:[%s]' % choice
if choice not in 'devq':
print 'Invalid option, try again'
else:
break
if choice == 'q':
break
CMDS[choice]()
if __name__ == '__main__':
showMenu()
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