Hello World app using RxConf

Warning

It is assumed that you are using Python version >= 3.9 and either CPython or PyPy. It is assumed that Python is installed in PATH.

Prepare project

Create directory hello_world and open it.

On Unix or MacOS

python -m venv venv && source venv/bin/activate

On Windows

python -m venv venv
.\venv\Scripts\activate

Then install RxConf:

pip install rxconf

Prepare config files

test.yaml

app:
    hello_key: Hello

test.toml

[app]
world_key = "World"

Add env variable

• On Unix or MacOS: export APP_EXCLAMATION_MARK=!
• On Windows: set APP_EXCLAMATION_MARK=!

Let's manipulate them using RxConf

Create main.py in the same directory and open it in your favorite code editor / IDE.

Firstly, we want to load our configs

from rxconf import RxConf

yaml_conf = RxConf.from_file(config_path="test.yaml")
toml_conf = RxConf.from_file(config_path="test.toml")
env_conf = RxConf.from_env()

Note

RxConf has single interface for all config-types and interface for loading env-variables.

So what are yaml_conf, toml_conf and env_conf?

If you try to execute type() for them, you will see the heir of ConfigType.

This is layer that incapsulate Attributes structure model.

You can print() them or call repr() to see this structure.

Note

JFYI: we have ConfigResolver that resolves what concrete FileConfigType should be created based on extension.

Secondly, we want to access variables

hello_var = yaml_conf.app.hello_key
world_var = toml_conf.app.world_key
exclamation_mark = env_conf.app_exclamation_mark

Note

RxConf has single interface to create indistinguishable interface for all types of configs.

So what are hello_var, world_var and exclamation_mark?

If you try to execute type() for them, you will see the heir of AttributeType.

But there are very smart objects. They overrides primitive types, operands etc. and your can work with them as primitives:

hello_var + " " + world_var + exclamation_mark == "Hello World!"

If you will print the result, you will get True.

Types support & Type casting

So AttributeTypes can be converted to primitives if you want:

str(hello_var) == "Hello" — the string representation of hello_var value.

We supports all types that supports ConfigType you chose

Type	Yaml	Toml	Json	Dotenv	Ini
str	✅	✅	✅	✅	✅
int	✅	✅	✅	✅	✅
float	✅	✅	✅	✅	✅
bool	✅	✅	✅	✅	✅
None	✅	❌	❌	✅	✅
list	✅	✅	✅	❌	❌
set	✅	❌	❌	❌	❌
date	✅	✅	❌	❌	❌
datetime	✅	✅	❌	❌	❌

Note

You can iterate via AttributeType if it's value's primitive representation is iterable, hash it if it's hashable etc.

Exceptions handling

All exceptions can be raised by RxConf are inherited from rxconf.exceptions.RxConfError.

There are some of them:

• Not-existing file: rxconf.exceptions.ConfigNotFoundError.
• Unknown extension (that is not specified in any FileConfigType registered in ConfigResolver): rxconf.exceptions.InvalidExtensionError.
• Config with broken schema: rxconf.exceptions.BrokenConfigSchemaError.
• Unknown attribute (e.g. yaml_conf.some.unknown.attr): rxconf.exceptions.InvalidAttributeError.

All existing exceptions your can check in exceptions.py.

Async RxConf

RxConf is compatible with Asyncio. To use, import extension for base RxConf:

from rxconf import AsyncRxConf

Then load config:

async def main():
    conf = await AsyncRxConf.from_file_async(path="...")
    # Then use conf as same as RxConf

To test, you can run this function with asyncio:

import asyncio
asyncio.run(main())

Observers & Hot-Reload

In-develop...