python核心编程学习（二）
以下是一个queue的例子：#!/usr/bin/env pythonqueue = []def enQ():queue.append(raw_input('Enter new String').strip())def deQ():if len(queue)==0:print 'empty queue!'else:print 'removed [',queue.pop(0),']'def viewQ():print queueCMDs = {'e':enQ,'d':deQ,'v':viewQ}def showmenu():pr = """(E)nqueue(D)equeue(V)iew(Q)uitEnter choice:"""while True:while True:try:choice=raw_input(pr).strip().lower()except (EOFError,KeyboardInterrupt,IndexError):choice='q'print 'you picked:[%s]' % choiceif choice not in 'devq':print 'invalid option,try again'else:breakif choice=='q':breakCMDs()if __name__=='__main__':showmenu()
请注意：print 'removed [',queue.pop(0),']' 这句话，因为在原书中是这样的print 'removed [','queue.pop(0)',']' 所以怎么运行都不对 后来仔细检查了一下，原来是单引号的问题。<pre name="code" class="python"></pre>
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