python argparse:如何在出现错误时自动显示帮助? [英] python argparse: How can I display help automatically on error?

问题描述

当前，当我输入无效的选项或省略位置参数时，argparse将我踢回提示并显示我的应用程序的用法.可以，但是我宁愿自动显示完整的帮助列表(解释选项等)，而不要求用户键入

Currently when I enter invalid options or omit positional arguments, argparse kicks me back to the prompt and displays the usage for my app. This is ok, but I would rather automatically display the full help listing (that explains the options, etc) than require the user to type

./myscript.py -h

谢谢！

杰米

推荐答案

此线程具有以下代码段，似乎可以解决问题(略有修改).

This thread over at Google groups has the following code snippet which seems to do the trick (modified slightly).

class DefaultHelpParser(argparse.ArgumentParser):
    def error(self, message):
        sys.stderr.write('error: %s\n' % message)
        self.print_help()
        sys.exit(2)

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