argparse-print-defaults.md

Printing default values with argparse

Normal mode

• code (visu.py): ```Python parser = argparse.ArgumentParser(description=”View the live in your web browser”)

parser.add_argument(‘–config’,
help=’config.ini file of the run’,
required=False,
default=’../config.ini’)
parser.add_argument(‘–port’,
help=’specify port to run server’,
required=False,
default=5000,
type=int)
parser.add_argument(‘-r’, ‘–reload’,
help=’Description’,
action=’store_true’)
args = parser.parse_args()

- Using the script:
```Shell
$ python visu.py --help

usage: visualisator.py [-h] [--config CONFIG] [--port PORT] [-r]

View the live in your web browser

optional arguments:
  -h, --help       show this help message and exit
  --config CONFIG  config.ini file of the run
  --port PORT      specify port to run server
  -r, --reload     Description

Using ArgumentDefaultsHelpFormatter

• Change the first line of visu.py to:

  parser = argparse.ArgumentParser(description="View the live in your web browser",       
                                 formatter_class=argparse.ArgumentDefaultsHelpFormatter)
  

• Using the script: ```Shell $ python visu.py –help

usage: visualisator.py [-h] [–config CONFIG] [–port PORT] [-r]

View the live in your web browser

optional arguments: -h, –help show this help message and exit –config CONFIG config.ini file of the run (default: ../config.ini) –port PORT specify port to run server (default: 5000) -r, –reload Description (default: False) ```