python核心编程学习（一）
以下是核心编程中一个stack的例子：
'''Created on 2012-3-6@author: Administrator'''#!/usr/bin/env pythonstack=[]def pushit(): stack.append(raw_input('Enter new String').strip()) def popit(): if len(stack)==0: print 'has empty!' else: print 'remove [', stack.pop() ,']' def viewstack(): print stack CMDs = {'u':pushit,'o':popit,'v':viewstack}def showmenu(): pr=""" p(U)sh p(O)p (V)iew (Q)uit Enter choice : """ while True: while True: try: choice = raw_input(pr).strip()[0].lower() except (EOFError,KeyboardInterrupt,IndexError): choice = 'q' print '\nYou picked:[%s]' % choice if choice not in 'uovq': print 'Invalid option,try again' else: break if choice =='q': break CMDs[choice]() if __name__=='__main__': showmenu() 请切记python编程中空格的重要性哦！
