使用optparse接受参数的最Python的方式 [英] Most pythonic way of accepting arguments using optparse

问题描述

我目前有利用sys.argv中[1]接受在命令行的字符串Python文件。然后，该字符串执行操作，然后返回修改后的字符串命令行。

I currently have a python file that utilizes sys.argv[1] to accept a string at the command line. It then performs operations on that string and then returns the modified string to the command line.

我想实现批量模式选项中，我可以提供的字符串（每行一个，FWIW）的文件，并使其返回到命令行，这样我可以重定向输出做这样的事情。

I would like to implement a batch mode option in which I can provide a file of strings (one per line, fwiw) and have it return to the command line so that I can redirect the output doing something like

$ python script.py -someflag file.txt > modified.txt 

同时仍保留现有的能力。

while still retaining the current capabilities.

我只跑2.6，所以argparse是不是一种选择。我看到无论是教程采用argparse，getopt的，或深入到过于复杂/不适用的例子。

I am only running 2.6, so argparse is not an option. The tutorials I have seen either use argparse, getopt, or delve into examples that are too complex/don't apply.

什么是检查输入，并采取适当行动的最佳方式？

What is the best way to check the input and act appropriately?

推荐答案

argparse 仍是一个选项，它只是不内置2.6。您仍然可以安装它像任何第三方包（例如，使用的easy_install argparse ）。

argparse is still an option, it's just not built into 2.6. You can still install it like any 3rd party package (for example, using easy_install argparse).

这code的一个例子是：

An example of code for this would be:

import sys
import argparse

p = argparse.ArgumentParser(description="script.py")
p.add_argument("-s", dest="string")
p.add_argument("-f", dest="infile")

args = p.parse_args()

if args.infile == None and args.string == None:
    print "Must be given either a string or a file"
    sys.exit(1)
if args.infile != None and args.string != None:
    print "Must be given either a string or a file, not both"
    sys.exit(1)
if args.infile:
    # process the input file one string at a time
if args.string:
    # process the single string

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