利用python列表的操作，利用選單的形式實現棧和佇列

棧：

stack=[]
def push():
    stack.append(input('enter: ').strip())
def pop():
    if len(stack)==0:
        print('connot pop from an empty stack')
    else :
        print('Remove[',stack.pop(),']')
def viewstack():
    print(stack)
CMDS={'u':push,'o':pop,'v':viewstack}
def
 
 showmenu():
    pr="""
p(U)sh
p(O)p
(V)iew
(Q)uit
Enter chioce: """
    while True:
        while True:
            try:
                choice=input(pr).strip()[0].lower()
            except(EOFError,KeyboardInterrupt,IndexError):
                choice='q'
            print('\nYour choice [%s]' % choice)

            if
 
 choice not in 'uvoq':
                print('Invalid option!')
            else :
                break
        if choice=='q':
            break
        CMDS[choice]();
if __name__=='__main__':
    showmenu()

佇列：

#queue of python
#author:gaolee
queue=[]
def push():
    queue.append(input('Enter :'
 
).strip())
def pop():
    if len(queue)==0:
        print('Cannot pop from an empty queue')
    else:
        print('Remove [ ',queue.pop(0),' ]')
def viewQ():
    print(queue)
menu={'e':push,'d':pop,'v':viewQ}
def showmenu():
    pr="""
(E)nqueue
(D)equeue
(V)iewQ
(Q)uit
Enter chioce: """
    while True:
        while True:
            try:
                choice=input(pr).strip()[0].lower()
            except(EOFError,KeyboardInterrupt,IndexError):
                choice='q'
            print('\nYour choice [%s]' % choice)

            if choice not in 'edvq':
                print('Invalid option!')
            else :
                break
        if choice=='q':
            break
        menu[choice]();
if __name__=='__main__':
    showmenu()