delegatum 1.0.0

Simple cascading/nested scope/namespace manager

Simple cascading/nested scope/namespace manager

Delegatum walks a list of objects that can represent key/value mappings and returns the first match found for a key.

• Supports dictionaries, argparse, configparser, mapping functions

• Most dictionary-like objects should work as well

• Python json and yaml parsers return dictionaries, and so are supported

Examples

The following example searches, in order: command line arguments, a config file, a json string, a yaml string, and the output of a function.

import delegatum
import json
import yaml # Requires external package PyYAML
j = json.loads('{"verbose": true, "output": "file.txt"}')
y = yaml.safe_load(some_yaml_string)
some_f = lambda x: x * x
delegatus = delegatum.Delegatum([cmdline, configfile, j, y, some_f])
print(delegatus['verbose'])
print(delegatus['garbage'])

Attributes

defaultobject

Default value to return if no lookup succeeds

Raises

DelegatumError

General library error; should only occur if misconfigured

DelegatumMissError

Used internally for flow control

See Also

Standard library:

• argparse

• configparser

• json

• tomllib

External modules:

• PyYAML

• https://pypi.org/project/nested-lookup/

Credits

This package was created with Cookiecutter and the audreyr/cookiecutter-pypackage project template.