argparse

I am trying to learn how to use python's argparse module. Currently my python script is: parser = argparse.ArgumentParser(description='My first argparse attempt', add_help=True) parser.add_argument("-q", action ="store", dest='argument', help="First argument") output = parser.parse_args() And it gives the output as : usage: test.py [-h] [-q ARGUMENT] My first argparse attempt optional arguments: -h, --help show this help message and exit -q ARGUMENT First argument Now, lets suppose I want my -h or --help argument to print a usage example also. Like, Usage: python test.py -q "First Argument for

I am reading through argparse module. I got stuck as what to metavar and action means >>> parser.add_argument('integers', metavar='N', type=int, nargs='+', ... help='an integer for the accumulator') >>> parser.add_argument('--sum', dest='accumulate', action='store_const', ... const=sum, default=max, ... help='sum the integers (default: find the max)') I might have missed but from what I read, I could not find definitions for metavar and action (action="store_const", etc) . what do they actually mean? metavar is used in help messages in a place of an expected argument. See FOO is a default

转： http://vra.github.io/2017/12/02/argparse-usage/ argparse 是python自带的命令行参数解析包，可以用来方便地读取命令行参数，当你的代码需要频繁地修改参数的时候，使用这个工具可以将参数和代码分离开来，让你的代码更简洁，适用范围更广。 argparse使用比较简单，常用的功能可能较快地实现出来，下面我分几个步骤， 以Python3为例 ，逐渐递增地讲述argparse的用法。 下面是使用argparser从命令行获取用户名，然后打印’Hello ‘+ 用户名，假设python文件名为 print_name.py : # file-name:print_name.pyimport argparsedef get_parser(): parser = argparse.ArgumentParser(description="Demo of argparse") parser.add_argument('--name', default='Great') return parserif __name__ == '__main__': parser = get_parser() args = parser.parse_args() name = args.name print('Hello {}'.format(name))

作用就是用来为脚本添加命令行参数，例如下面的代码： # coding:utf-8 from __future__ import absolute_import import argparse import os import logging from src . tfrecord import main def parse_args (): parser = argparse . ArgumentParser () parser . add_argument ( '-t' , '--tensorflow-data-dir' , default = 'pic/' ) parser . add_argument ( '--train-shards' , default = 2 , type = int ) parser . add_argument ( '--validation-shards' , default = 2 , type = int ) parser . add_argument ( '--num-threads' , default = 2 , type = int ) parser . add_argument ( '--dataset-name' , default = 'satellite' , type = str ) return parser .

I'm trying to use argparse to parse the command line arguments for a program I'm working on. Essentially, I need to support multiple positional arguments spread within the optional arguments, but cannot get argparse to work in this situation. In the actual program, I'm using a custom action (I need to store a snapshot of the namespace each time a positional argument is found), but the problem I'm having can be replicated with the append action: >>> import argparse >>> parser = argparse.ArgumentParser() >>> parser.add_argument('-a', action='store_true') >>> parser.add_argument('-b', action=

argparse 是一个命令行参数解析模块。 argparse argparse使用比较简单，常用的功能可能较快地实现出来。 【Reference】 1、argparse简要用法总结： http://vra.github.io/2017/12/02/argparse-usage/

argparse 1基本函数 2例子程序演示 3常用参数解释 4argparse模块整理的缘起 1基本函数 argparse是Python中用于命令行中进行参数解析的一个模块，可以自动生成help和usage信息；当从终端输入的参数无效时，模块会输出提示信息。 Argparse常用的三个函数： parser=Argparse.ArgumentParser() ArgumentParser()用于创建一个ArgumentParser对象parser，parser保存了所有必要信息，用于将“从命令行中读入的参数”解析为对应的python数据类型。 parser.add_argument() 用于给parser添加需要读取数据的信息，这些信息告诉parser解析读入参数的方法 args = parser.parse_args() 用于解析parser保存的参数，返回一个命名空间 在实际python脚本中parse_args()一般不使用参数，它的参数由sys.argv确定。 2例子程序演示 将下列代码存成.py文件，在终端中运行。 import argparse parser=argparse.ArgumentParser(description="process some integer.") parser.add_argument('integers',metavar='N'

I am creating a python script where I want to have an argument that manipulates how many search results you get as output. I've currently named the argument --head . This is the functionality I'd like it to have: When --head is not passed at the command line I'd like it to default to one value. In this case, a rather big one, like 80 When --head is passed without any value, I'd like it to default to another value. In this case, something limited, like 10 When --head is passed with a value, I'd like it to store the value it was passed. Here is some code describing the problem: >>> import