Install

Serialization with JSON

pip install -U TreeStructConfig

Serialization with TOML

pip install -U TreeStructConfig[toml]

Usage

Define class and create object

from tree_struct_config import (
    IntLeaf,
    StringLeaf,
    BooleanLeaf,
    ListLeaf,

    BranchNode,

    RootNode,
    SerializationFormat,
    SerializationDecodeError,
)


class Config(RootNode):
    version = StringLeaf('0.1.0')

    class Auth(BranchNode):
        username = StringLeaf('rex')
        password = StringLeaf('password')

    class Wireless(BranchNode):
        class AP(BranchNode):
            enabled = BooleanLeaf(True)
            channel = IntLeaf(1)
            password = StringLeaf('password')
            mac_acl_list = ListLeaf([
                '00:00:00:00:00:00',
            ])


config = Config()

Access config value

>>> config.Auth.username
rex
>>> username = config.Auth.username
>>> username
rex

Update config value

>>> config.Auth.username = 'new_user'
>>> config.Auth.username
new_user
>>> config.Wireless.AP.password = 'new_password'
>>> config.Wireless.AP.password
new_password

Dump config to JSON string

>>> config.dumps()
{
  "Auth": {
    "password": "password",
    "username": "rex"
  },
  "Wireless": {
    "AP": {
      "channel": 1,
      "enabled": true,
      "mac_acl_list": [
        "00:00:00:00:00:00"
      ],
      "password": "new_password"
    }
  },
  "version": "0.1.0"
}

Load config from JSON string

>>> json_str = """
...     {
...       "Auth": {
...         "username": "new_user"
...       },
...       "Wireless": {
...         "AP": {
...           "channel": 1,
...           "enabled": true,
...           "password": "new_password",
...         }
...       }
...     }
... """
...
>>> config.Auth.username
rex
>>> config.loads(json_str)
>>> config.Auth.username
new_user

Dump config to JSON file

>>> with open('config.json', 'w') as f:
...     config.dump(f)

Load config from JSON file

>>> with open('config.json') as f:
...     config.load(f)

Dump to TOML and load from TOML string and file

>>> config.dumps(serialization_format=SerializationFormat.TOML)
>>> config.loads(s, serialization_format=SerializationFormat.TOML)

>>> with open('config.toml', 'w') as f:
...     config.dump(f, serialization_format=SerializationFormat.TOML)
>>> with open('config.toml') as f:
...     config.load(f, serialization_format=SerializationFormat.TOML)

config.toml

version = "0.1.0"

[Auth]
password = "password"
username = "rex"

[Wireless.AP]
channel = 1
enabled = true
mac_acl_list = [ "00:00:00:00:00:00",]
password = "password"

Override dump() and load() function

class AdvancedConfig(Config):
    """override dump/load function"""
    _filename = None

    def dump(self, fp=None, serialization_format=None):
        with open(self._filename, 'w') as fp:
            super().dump(fp, serialization_format)

        return

    def load(self, fp=None, serialization_format=None):
        with open(self._filename) as fp:
            try:
                super().load(fp, serialization_format)

            except SerializationDecodeError:
                pass


advanced_config = AdvancedConfig()
advanced_config._filename = 'config.json'
advanced_config.dump()
advanced_config.load()

Demo

Demo source code: https://github.com/rexzhang/tree-struct-config/blob/master/demo.py

Output

----------
password
new_password
----------
{
  "Auth": {
    "password": "password",
    "username": "rex"
  },
  "Wireless": {
    "AP": {
      "channel": 1,
      "enabled": true,
      "mac_acl_list": [
        "00:00:00:00:00:00"
      ],
      "password": "new_password"
    }
  },
  "version": "0.1.0"
}
----------
xxxxxxxx

Changelog

Alternative

• https://gitlab.com/alelec/structured_config