argparse

Argparse入门介绍

由 一世执手 提交于 2020-02-01 10:07:02
argparse 模块是 Python 标准库中推荐的命令行解析模块。 下面链接所示为argparse的官方doc教程 链接: https://docs.python.org/zh-cn/3/howto/argparse.html#id1 文档是python3版本,如果使用python2允许则会出现相应的错误. (linux下直接输入python 默认的是Python2,输入python3才能执行python3) --------------------------------------------------------------- 针对该文档,如果用python2可能出现的问题记录: 1. 原文: 我在用python2时实际执行时的结果: 2. 原文: 我在用python2时实际执行时的结果: 来源： CSDN 作者： 小飞侠985 链接： https://blog.csdn.net/a806689294/article/details/104113649

Python 基础（二十一）：argparse 模块

由 ぃ、小莉子 提交于 2020-01-31 10:40:19
目录 1. 简介 2. 使用 1. 简介 argparse 模块主要用于处理 Python 命令行参数和选项，程序定义好所需参数后，该模块会通过 sys.argv 解析出那些参数；除此之外，argparse 模块还会自动生成帮助和使用手册，并在用户给程序传入无效参数时报出错误信息。使用 argparse 模块，我们可以轻松的编写出用户友好的命令行接口。 2. 使用 我们先来看一个简单示例： import argparse # 创建解析对象 parser = argparse . ArgumentParser ( ) # 解析 parser . parse_args ( ) 文件名为 test.py ，在控制输入命令： python test.py --help ，执行结果： usage : test . py [ - h ] optional arguments : - h , - - help show this help message and exit 通过上面的执行结果，我们可以看出 Python 的可选参数包括： --help 和其简写 -h ，Python 使用 - 来指定短参数，使用 -- 来指定长参数 ，我们执行一下 python test.py -h ，执行结果： usage : test . py [ - h ] optional arguments : - h

python argparse — customizing error messages

由 北城以北 提交于 2020-01-31 04:59:08
问题 I want to generate custom error messages for particular usage errors in my command-line program that uses the argparse library. I know I can override the general presentation of the error by subclassing argparse.ArgumentParser : class HelpParser(argparse.ArgumentParser): def error(self, message): sys.stderr.write('error: %s\n' % message) sys.exit(2) parser = HelpParser(... ...) args = parser.parse_args() But when my error method is called, message has already been formatted by the library.

Is it possible to use argparse to capture an arbitrary set of optional arguments?

由 情到浓时终转凉″ 提交于 2020-01-25 06:54:12
问题 Is it possible to use argparse to capture an arbitrary set of optional arguments? For example both the following should be accepted as inputs: python script.py required_arg1 --var1 value1 --var2 value2 --var3 value3 python script.py required_arg1 --varA valueA --var2 value2 --varB valueB a priori I don't know what optional arguments would be specified receive but would handle them accordingly. 回答1: This is kind of a hackish way, but it works very well: Check, which arguments are not added and

Is it possible to use argparse to capture an arbitrary set of optional arguments?

由 独自空忆成欢 提交于 2020-01-25 06:54:08
问题 Is it possible to use argparse to capture an arbitrary set of optional arguments? For example both the following should be accepted as inputs: python script.py required_arg1 --var1 value1 --var2 value2 --var3 value3 python script.py required_arg1 --varA valueA --var2 value2 --varB valueB a priori I don't know what optional arguments would be specified receive but would handle them accordingly. 回答1: This is kind of a hackish way, but it works very well: Check, which arguments are not added and

Python argparse check if flag is present while also allowing an argument

由 大城市里の小女人 提交于 2020-01-24 19:56:46
问题 How do I check if the flag --load is present? #!/usr/bin/env python3 import argparse import os parser = argparse.ArgumentParser(description='Process some integers.') parser.add_argument('-l', '--load', nargs='?', metavar='path', help='Load all JSON files recursively in path') args = parser.parse_args() print(args) Calling the script with --load outputs the following: Namespace(load=None) I can't omit nargs='?' and use action='store_true' as I'd like to allow an argument to be passed, for

Is there any way to get argparse.ArgumentParser.parse_args() not to exit on argument errors?

由 孤者浪人 提交于 2020-01-23 11:16:49
问题 For example: import argparse parser = arparse.ArgumentParser() # parser.add_argument(...) ... args = parser.parse_args(args_list) The problem is, parser.parse_args automatically exits if there is an error in args_list . Is there a setting that gets it to raise a friendlier exception instead? I do not want to have to catch a SystemExit and extract the needed error message from it if there is any way around it. 回答1: You could use args, unknown = parser.parse_known_args(args_list) Then, any

python学习之argparse模块

由 人走茶凉 提交于 2020-01-23 05:16:18
argparse 模块可以编写用户友好的命令行界面。 class argparse.ArgumentParser( prog=None, usage=None, description=None, epilog=None, parents=[], formatter_class=argparse.HelpFormatter, prefix_chars='-', fromfile_prefix_chars=None, argument_default=None, conflict_handler='error', add_help=True, allow_abbrev=True) 创建一个新的ArgumentParser对象。 所有参数应作为关键字参数传递。 每个参数在下面有其自己的更详细的描述,但简言之,它们是： prog - 程序的名称(默认值：sys.argv [0])usage - 描述程序使用的字符串(默认值：从添加到解析器的参数生成)description - 在参数帮助之前显示的文本(默认值：无)epilog - 参数帮助后显示的文本(默认值：无)parents - 也应包含其参数的ArgumentParser对象的列表formatter_class - 用于自定义帮助输出的类prefix_chars - 可选参数前缀的字符集(默认值：' - ')fromfile

Parameter dependencies in Python - can't make it work

由 六眼飞鱼酱① 提交于 2020-01-23 02:45:10
问题 I am trying to add a parameter dependency to my script. The idea is that --clone argument will require non-empty --gituser . After perusing this example, I tried the following In [93]: class CloneAction(argparse.Action): ...: def __call__(self, parser, namespace, _): ...: if not namespace.git_user and namespace.clone: ...: parser.error('"--clone" requires legal git user') ...: In [94]: parser = argparse.ArgumentParser() In [95]: parser.add_argument('-g', '--gituser', dest='git_user', type=str

Require either of two arguments using argparse

由 十年热恋 提交于 2020-01-22 04:09:49
问题 Given: import argparse pa = argparse.ArgumentParser() pa.add_argument('--foo') pa.add_argument('--bar') print pa.parse_args('--foo 1'.split()) how do I make at least one of "foo, bar" mandatory: --foo x , --bar y and --foo x --bar y are fine make at most one of "foo, bar" mandatory: --foo x or --bar y are fine, --foo x --bar y is not 回答1: I think you are searching for something like mutual exclusion (at least for the second part of your question). This way, only foo or bar will be accepted,
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