听起来命令行界面就是您要询问的那部分。将用户输入映射到命令的一种好方法是使用字典，并且在python中，您可以通过在函数名称后加上（）来运行对函数的引用。这是一个简单的例子，向您展示我的意思
def firstThing(): # this Could be your 'cd' task
print 'ran first task'
def secondThing(): # another task you would want to run
print 'ran second task'
def showCommands(): # a task to show available commands
print functionDict.keys()
# a dictionary mapping commands to functions (you Could do the same with classes)
functionDict = {'f1': firstThing, 'f2': secondThing, 'help': showCommands}
# the actual function that gets the input
def main():
cont = True
while(cont):
selection = raw_input('enter your selection ')
if selection == 'q': # quick and dirty way to give the user a way out
cont = False
elif selection in functionDict.keys():
functionDict[selection]()
else:
print 'my friend, you do not kNow me. enter help to see VALID commands'
if __name__ == '__main__':
main()
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