The Argparse module in Python

Argparse is the abbreviation for argument (parameter) and parser (parser)

The Argparse module is a parameter that is passed to a. py file. Use this module if you want to run the. py file directly while passing parameters to the file.

The steps for using this module are in the following stages:

1 Introducing Modules

Import Argparse

2 Creating a Parse Object parser

Parser = Argparse. Argumentparser ()

3 adding parameters to an object

Parser.add_argument (name or flag, nargs=, action=, type=, default=, help=)

The name parameter name, a fixed parameter, and an optional parameter, such as Add_argument ('-d '), indicate that the parameter-D is optional (can be passed in using or not passed in parameters)

The number of Nargs parameters, * represents 0 to more,? Indicates only one, + represents at least one, or can be a number directly specify the number of arguments

Type parameter, which is string by default and can be specified as Int,float,file

Default setting parameter Defaults

Help information to help you set parameters, using Python arg.py--help view, arg.py as the file name,--help default is the own

For example: Parser.add_argument (' A ', nargs= '? ' Type=int, default=10, help= "A is typeof int")

4 Call the Parse_args () method to parse, and then you can use the

arg = Parser.parse_args ()

5 Using Parameters

Arg.a

6 file saved as arg.py, run file python arg.py 12

Instance:

Import Argparse

Parser = Argparse. Argumentparser ()

Parser.add_argument ("A", nargs=2, Type=int, default=10, help= "A is typeof int")

Parser.add_argument ('-B ')

if __name__ = = ' __main__ ':

args = Parser.parse_args ()

Print args.a,args.b

Run: Python arg.py 12 13

Output [12,13] None

Here the incoming 12 and 13 are passed in to a in list form, B does not have an incoming value showing none

Run: Python arg.py 13-b AB

Output [12,13] ab

Incoming optional parameter-B shows AB

Official Document Address:

Https://docs.python.org/2/howto/argparse.html#id1

Reference:

http://blog.chinaunix.net/xmlrpc.php?r=blog/article&uid=21633169&id=4387657

Http://www.2cto.com/kf/201412/363654.html

This article is from the "Vintage Camera" blog, so be sure to keep this source http://7903389.blog.51cto.com/7893389/1789889

The Argparse module in Python