用python模拟CLI Shell [英] Simulating CLI Shell with python

问题描述

我被要求用Python模拟CLI。

I was asked to simulate CLI with Python.

这就是我所做的

def somefunction(a,b):
    //codes here
//consider some other functions too

print "--- StackOverFlow Shell ---"
while True:
    user_input = raw_input("#> ")
    splitit = user_input.split(" ")
    if splitit[0] == "add":
        firstNum = splitit[1]
        sNum = splitit[2]
        result = somefunction(firstNum, sNum)
        print result
    //consider some other elif blocks with "sub", "div", etc
    else:
        print "Invalid Command"

我也会检查列表，这里是 splitit，我将只允许3个参数，第一个是操作，第二个和第三个是要执行某些功能的参数，如果参数大于3，为此我放了一个检查。

I do also check the length of the list, here "splitit" I will allow only 3 argumets, first will be the operation, and second and third are the arguments with which some functions are to be performed, in case the argument is more than 3, for that i do put a check.

尽管我设法以某种方式使它起作用，但是有没有更好的方法来实现相同的目的？

Though Somehow I manage to make it work, but is there a better way to achieve the same?

推荐答案

使用python CMD 模块：

Use python CMD Module:

请检查以下页面上提供的一些示例

Check few examples given on the below pages

http://docs.python.org/library/cmd.html ＃支持面向行的命令解释器

http://docs.python.org/library/cmd.html # Support for line-oriented command interpreters

http://www.doughellmann.com/PyMOTW/cmd -＃创建面向行的​​命令处理器

http://www.doughellmann.com/PyMOTW/cmd - # Create line-oriented command processors

提示设置为每次要求用户输入新命令时要打印的字符串。

prompt can be set to a string to be printed each time the user is asked for a new command.

简介是程序开始时显示的欢迎消息。

intro is the "welcome" message printed at the start of the program.

例如：

import cmd

class HelloWorld(cmd.Cmd):
    """Simple command processor example."""

    prompt = 'prompt: '
    intro = "Simple command processor example."

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