从Argparse中的parse.add_argument提取值-python [英] Extract values from parse.add_argument in Argparse - python
问题描述
我正在使用Argparse作为命令行实用程序执行的手段.我定义了各种参数(下面显示了其中的几个).我需要存储参数名称,帮助,并在各自的列中输入数据库.
I am using Argparse as a means to command line utility execution. I have various arguments defined ( couple of them shown below ). I have a requirement to store argument name, help, type in the database in their respective columns.
我不确定如何从每个parse.add_argument中提取这三个并将其保存在某个数组/列表中.如果您可以共享任何输入,那将很有帮助.
I am not sure how to extract these three from each parse.add_argument and save it in some array/list. If you can share any inputs, that would be helpful.
parser.add_argument("num",help="The fibnocacci number to calculate:", type=int) # how to take the strings on the command line and turn them into objects
parser.add_argument("-f","--file",help="Output to the text file",action="store_true")
推荐答案
其他人认为您需要解析命令行的结果,即args
命名空间中的值.但是我怀疑您想要由add_argument
方法定义的Action
对象
Others think you want the results of parsing the commandlline, the values from the args
namespace. But I suspect you want the Action
object defined by the add_argument
method
在交互式shell中,我可以将解析器定义为:
In an interactive shell I can define a parser as:
In [207]: parser=argparse.ArgumentParser()
In [208]: arg1= parser.add_argument("num",help="The fibnocacci number to calculate:", type=int)
In [209]: arg2=parser.add_argument("-f","--file",help="Output to the text file",action="store_true")
In [210]: arg1
Out[210]: _StoreAction(option_strings=[], dest='num', nargs=None, const=None, default=None, type=<type 'int'>, choices=None, help='The fibnocacci number to calculate:', metavar=None)
In [211]: arg2
Out[211]: _StoreTrueAction(option_strings=['-f', '--file'], dest='file', nargs=0, const=True, default=False, type=None, choices=None, help='Output to the text file', metavar=None)
In [212]: parser._actions
Out[212]:
[_HelpAction(option_strings=['-h', '--help'], dest='help', nargs=0, const=None, default='==SUPPRESS==', type=None, choices=None, help='show this help message and exit', metavar=None),
_StoreAction(option_strings=[], dest='num', nargs=None, const=None, default=None, type=<type 'int'>, choices=None, help='The fibnocacci number to calculate:', metavar=None),
_StoreTrueAction(option_strings=['-f', '--file'], dest='file', nargs=0, const=True, default=False, type=None, choices=None, help='Output to the text file', metavar=None)]
add_argument
创建一个Action
子类(基于action
参数).您可以将其保存在自己的变量中,也可以在解析器的_actions
列表中找到它.
add_argument
creates an Action
subclass (based on action
parameter). You can save this in your own variable, or find it in the _actions
list of the parser.
打印此内容将显示其某些属性,但是您可以检查甚至更改更多的属性.
Printing this shows some of its attributes, but you can examine, and even change more of them.
In [213]: arg1.help
Out[213]: 'The fibnocacci number to calculate:'
In [214]: arg1.type
Out[214]: int
In [215]: arg1.dest
Out[215]: 'num'
In [217]: vars(arg1)
Out[217]:
{'choices': None,
'const': None,
'container': <argparse._ArgumentGroup at 0x8f0cd4c>,
'default': None,
'dest': 'num',
'help': 'The fibnocacci number to calculate:',
'metavar': None,
'nargs': None,
'option_strings': [],
'required': True,
'type': int}
许多人需要检查argparse.py
文件中的类定义以了解这些属性.
You many need to examine the class definitions in the argparse.py
file to understand these attributes.
这篇关于从Argparse中的parse.add_argument提取值-python的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!