argparse

My argparse has only 3 flags (store_true) on the top level, everything else is handled through subparsers. When I run myprog.py --help , the output shows a list of all subcommands like normal, {sub1, sub2, sub3, sub4, ...} . So, the default is working great... I usually can't remember the exact subcommand name I need, and all of its options. So I end up doing 2 help lookups: myprog.py --help myprog.py sub1 --help I do this so often, I decided to cram this into one step. I would rather have my toplevel help output a huge summary, and then I scroll through the list manually. I find it is much

My script defines one main parser and multiple subparsers. I want to apply the -p argument to some subparsers. So far the code looks like this: parser = argparse.ArgumentParser(prog="myProg") subparsers = parser.add_subparsers(title="actions") parser.add_argument("-v", "--verbose", action="store_true", dest="VERBOSE", help="run in verbose mode") parser_create = subparsers.add_parser ("create", help = "create the orbix environment") parser_create.add_argument ("-p", type = int, required = True, help = "set db parameter") # Update parser_update = subparsers.add_parser ("update", help = "update

This might be a simple one. Assume I have a program that uses argparse to process command line arguments/options. The following will print the 'help' message: ./myprogram -h or: ./myprogram --help But, if I run the script without any arguments whatsoever, it doesn't do anything. What I want it to do is to display the usage message when it is called with no arguments. How is that done? This answer comes from Steven Bethard on Google groups . I'm reposting it here to make it easier for people without a Google account to access. You can override the default behavior of the error method: import

『讲解开源项目系列』启动——让对开源项目感兴趣的人不再畏惧、让开源项目的发起者不再孤单。跟着我们的文章，你会发现编程的乐趣、使用和发现参与开源项目如此简单。欢迎联系我们给我们投稿，让更多人爱上开源、贡献开源～ 前言 你是否好奇过在命令行中敲入一段命令后，它是如何被解析执行的？是否考虑过由自己实现一个命令行工具，帮你执行和处理任务？是否了解过陪伴在你身边的 Python 有着丰富的库，来帮你轻松打造命令行工具？ 别着急，本文作为 Python 命令行之旅的第一篇将带你逐步揭开命令行解析的面纱，介绍如何使用 Python 内置的 argparse 标准库解析命令行，并在后续的系列文章中介绍各具特色的第三方命令行库，讲讲它们的异同，进而全面地体验这次探索的旅程。 本系列文章默认使用 Python 3 作为解释器进行讲解。 若你仍在使用 Python 2，请注意两者之间语法和库的使用差异哦~ 介绍 argparse 作为 Python 内置的标准库，提供了较为简单的方式来编写命令行接口。当你在程序中定义需要哪些参数， argparse 便会从 sys.argv 中获取命令行输入进行解析，对正确或非法输入做出响应，也可以自动生成帮助信息和使用说明。 快速开始 设置解析器 第一步要做的就是设置解析器，后续对命令行的解析就依赖于这个解析器，它能够将命令行字符串转换为 Python 对象。

Optparse, the old version just ignores all unrecognised arguments and carries on. In most situations, this isn't ideal and was changed in argparse. But there are a few situations where you want to ignore any unrecognised arguments and parse the ones you've specified. For example: parser = argparse.ArgumentParser() parser.add_argument('--foo', dest="foo") parser.parse_args() $python myscript.py --foo 1 --bar 2 error: unrecognized arguments: --bar Is there anyway to overwrite this? Replace args = parser.parse_args() with args, unknown = parser.parse_known_args() For example, import argparse