Bind dictionary data into named tuples and dataclasses automatically for typed attribute access throughout the rest of your codebase.
from bindr import bind from typing import Dict, List, NamedTuple from yaml import safe_load class Config(NamedTuple): class SMSServiceConfig(NamedTuple): host: str port: int username: str password: str class S3Config(NamedTuple): default_bucket: str default_region: str max_item_size: int support_emails: List[str] api_key: str timeout_ms: int pi: float sms_providers: List[SMSServiceConfig] s3_settings: S3Config accounts: Dict[str, str] config = bind(Config, safe_load("config.yaml")) config.s3_settings.max_item_size # <-- int
pip install bindr
Why does this exist?
Bindr is not meant to serve as a replacement for 12Factor methodology. There are certain niche cases where you might want to read in a structured file (such as JSON or YAML) and bind it directly to a typed object outside of application configuration (as demonstrated in the example above). In fact, application configuration created as a dictionary (perhaps from environment variables) is still a valid use case for a bound object.
Bindr exists as an alternative to the automatic binding syntax offered by PyYAML. The default object deserialization syntax in PyYAML is a leaky abstraction. Declarative data formats such as YAML should not be concerned with the details of how objects are deserialized in your application code.
Objects generated via Bindr will give you typed objects that can be passed around and verified by MyPy and hinted in PyCharm, which is a distinct advantage over accessing multiple levels deep of nested dictionaries.
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