tomly 0.1.4

A wrapper around rtoml providing tomli-compatible behavior with enhanced convenience methods for intuitive value access.

tomly

tomly is a lightweight wrapper around rtoml, designed to provide tomli/tomllib compatible behavior while offering enhanced convenience methods for intuitive data access.

Key Features

• 🎯 Dot Notation: Access and modify nested dictionary keys as object attributes (e.g., config.db.port).
• 🌍 Environment Interpolation: Automatically expand ${VAR_NAME:default} patterns within strings during loading.
• 🌳 Nested Path Operations: Safely get, set, or delete deep values using dot-separated strings or iterables.
• 🔒 Immutability (Freeze): Protect your configuration from accidental runtime changes.
• 🥞 Flattening: Convert nested structures into a single-level dictionary for environment variables or logging.
• ⚡ High Performance: Built on top of rtoml (Rust-powered) for rapid parsing and serialization.

Installation

pip install tomly

Quick Start

1. Basic Loading & Attribute Access

import tomly as toml
from tomly import DataDict

toml_data = """
[server]
host = "127.0.0.1"
port = 8080
"""

# Parse and wrap into DataDict
config = DataDict(toml.loads(toml_data))

# Access via dot notation
print(config.server.host)  # "127.0.0.1"
config.server.port = 9000   # Set values like an object

2. Environment Variable Interpolation

import os
from tomly import DataDict

os.environ["APP_ENV"] = "production"

# DataDict can resolve ${VAR_NAME} or ${VAR_NAME:default}
data = {"env": "${APP_ENV:dev}", "debug": "${DEBUG:false}"}
config = DataDict(data, interpolate_env=True)

print(config.env) # "production"
print(config.debug) # "false" (using default value)

3. Deep Path Manipulation

from tomly import DataDict

config = DataDict()

# Set values at deep paths (auto-creates intermediate dicts)
config.set_nested("app.services.auth.timeout", 30)

# Safe retrieval without KeyErrors
timeout = config.get_nested("app.services.auth.timeout", default=60)

# Delete a nested structure
config.delete_nested("app.services.auth")

4. Read-only Configuration

from tomly import DataDict

config = DataDict({"api": {"version": "v1"}})
config.freeze()

# This will raise a TypeError
config.api.version = "v2"