eyconf 0.0.3

Easy yaml based configuration for Python

EYConf

Easy Yaml based Configuration for Python

Features

• Generate: Automatically convert a schema to a yaml configuration file, including comments!
• Validate: Validate a given configuration file against your schema and raise human readable errors!
• Extend: Introduce custom logic by extending the EYConf class!
• Reload: Reload your configuration on the fly without restarting your application!

Installation

You can install EYConf from PyPI using pip.

pip install eyconf

Quickstart

First of define a configuration schema using dataclasses.

from dataclasses import dataclass
from typing import Optional

@dataclass
class Transport:
    """Email transport configuration"""
    host: str = 'imap.example.com'
    port: int = 993
    username: str = 'user'
    password: str = 'password'
    use_ssl: bool = False

@dataclass
class Other:
    """Other configuration options"""
    bar: Optional[int]

@dataclass
class ConfigSchema:
    """My configuration schema

    Docstrings are used as comments in the generated yaml file!
    """
    transport: Transport
    other: Other

We can now create a configuration using the EYConf class directly, if you need more control it is also possible to extend the class.

# Using create_config_class helper function
from eyconf import EYConf

config = EYConf(ConfigSchema,'config.yaml')

This created the config.yaml file in your current working directory with the following content. Notice that the docstrings are used as comments in the generated yaml file.

# My configuration schema
# Docstrings are used as comments in the generated yaml file!

transport:
  # Email transport configuration

  host: imap.example.com
  port: 993
  username: user
  password: password
  use_ssl: false

other:
  # Other configuration options

  bar: null

You can access your configuration directly as attributes of the config object.

assert type(config.transport) == Transport
assert config.transport.host == "imap.example.com"

If you want to change the configuration, you can do so by editing the config.yaml file directly and reloading the configuration.

...
transport:
  host: changed.example.com

config.refresh()
assert config.transport.host == "changed.example.com"