Declarative argparse definition
Project description
A wrapper around the standard argparse module that allows you to describe argument parsers declaratively.
By default, the argparse module suggests creating parsers imperative, which is not convenient from the point of view of type checking and access to attributes, of course, IDE autocompletion and type hints not applicable in this case.
This module allows you to declare command-line parsers with classes.
import logging
import argclass
class AddressPortGroup(argclass.Group):
address: str = argclass.Argument(default="127.0.0.1")
port: int
class Parser(argclass.Parser):
log_level: int = argclass.LogLevel
http = AddressPortGroup(title="HTTP options", defaults=dict(port=8080))
rpc = AddressPortGroup(title="RPC options", defaults=dict(port=9090))
parser = Parser(
config_files=[".example.ini", "~/.example.ini", "/etc/example.ini"],
auto_env_var_prefix="EXAMPLE_"
)
parser.parse_args()
logging.basicConfig(level=parser.log_level)
logging.info('Listening http://%s:%d', parser.http.address, parser.http.port)
logging.info(f'Listening rpc://%s:%d', parser.rpc.address, parser.rpc.port)
assert parser.http.address == '127.0.0.1'
assert parser.rpc.address == '127.0.0.1'
assert parser.http.port == 8080
assert parser.rpc.port == 9090Run this script:
$ python example.py
INFO:root:Listening http://127.0.0.1:8080
INFO:root:Listening rpc://127.0.0.1:9090Example of --help output:
$ python example.py --help
usage: example.py [-h] [--log-level {debug,info,warning,error,critical}]
[--http-address HTTP_ADDRESS] [--http-port HTTP_PORT]
[--rpc-address RPC_ADDRESS] [--rpc-port RPC_PORT]
optional arguments:
-h, --help show this help message and exit
--log-level {debug,info,warning,error,critical}
(default: info)
HTTP options:
--http-address HTTP_ADDRESS
(default: 127.0.0.1)
--http-port HTTP_PORT
(default: 8080)
RPC options:
--rpc-address RPC_ADDRESS
(default: 127.0.0.1)
--rpc-port RPC_PORT (default: 9090)Release history Release notifications | RSS feed
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