Python中argparse模块的使用

argparse是python用于解析命令行参数的标准模块，用法如下：

import argparse

def test(a, b):
print int(a)+int(b)

parser=argparse.ArgumentParser() # 创建解析器
parser.add_argument("-x","--x",dest="a") # 增加命令行参数
parser.add_argument("-y","--y",dest="b")
args=parser.parse_args()

test(a=args.a, b=args.b)

命令行下进行测试：



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更多参数介绍如下：

class argparse.ArgumentParser([description][, epilog][, prog][, usage][, add_help][, argument_default][, parents][, prefix_chars][, conflict_handler][, formatter_class])

    * description - Text to display before the argument help.

    * epilog - Text to display after the argument help.

    * add_help - Add a -h/–help option to the parser. (default: True)

    * argument_default - Set the global default value for arguments. (default: None)

    * parents - A list of ArgumentParser objects whose arguments should also be included.

    * prefix_chars - The set of characters that prefix optional arguments. (default: ‘-‘)

    * fromfile_prefix_chars - The set of characters that prefix files from which additional arguments should be read. (default: None)

    * formatter_class - A class for customizing the help output.

    * conflict_handler - Usually unnecessary, defines strategy for resolving conflicting optionals.

    * prog - The name of the program (default: sys.argv[0])

    * usage - The string describing the program usage (default: generated)

ArgumentParser.add_argument(name or flags...[, action][, nargs][, const][, default][, type][, choices][, required][, help][, metavar][, dest])

    * name or flags - Either a name or a list of option strings, e.g. foo or -f, --foo.

    * action - The basic type of action to be taken when this argument is encountered at the command line.

    * nargs - The number of command-line arguments that should be consumed.

    * const - A constant value required by some action and nargs selections.

    * default - The value produced if the argument is absent from the command line.

    * type - The type to which the command-line argument should be converted.

    * choices - A container of the allowable values for the argument.

    * required - Whether or not the command-line option may be omitted (optionals only).

    * help - A brief description of what the argument does.

    * metavar - A name for the argument in usage messages.

    * dest - The name of the attribute to be added to the object returned by parse_args().