argparse-env - argparse with environment

Use this package when you want to be able to set arguments wither at the command line or through environment variables.

from argparse_env import EnvArgumentParser

parser = EnvArgumentParser(env_prefix="MYAPP")
parser.add_argument
>>> from argparse_env import EnvArgumentParser
>>> parser = EnvArgumentParser(env_prefix='MYAPP')
>>> parser.add_argument("--hello", type=str, default="Alex" help="Say hello to.")
>>> parser.parse_args(["--hello", "Jane"])
Namespace(hello='Jane')
>>> parser.parse_args([])
Namespace(hello=Alex)
>>> import os
>>> os.environ["MYAPP_HELLO"] = "Jim"
>>> parser.parse_args([])
Namespace(hello='Jim')
>>> parser.parse_args(["--hello", "Jane"])
Namespace(hello='Jane')

argparse Feature Support

There are some extras added to the class to support argparse features from environment variables.

nargs

Provide arguments with nargs != 1 using a comma-separated list in an environment variable.

MYAPP_NARGS_MANY=arg1,arg2,arg3

store true/false

Use true, 1, or on for True or false, 0, or off for False.

MYAPP_STORE_FALSE=false
MYAPP_STORE_FALSE=off
MYAPP_STORE_TRUE=true
MYAPP_STORE_TRUE=1