contextvars-registry
contextvars_registry is an extension for the Python’s contextvars module.
In case you’re not familiar with Context Variables, they work like Thread Local Storage, but better:
Context variables are both thread-safe and async task-safe (work seamlessly across
threading,asyncio,gevent, and probably other concurrency mechanisms).Cheap snapshots: all variables are copied at once in O(1) time (and then you can
run()a function in the copied isolated context).
The Python’s contextvars is a powerful module, but its API seems too low-level.
So this contextvars_registry package provides some higher-level additions on top of the
standard API. Most notably, it allows to group ContextVar objects
in a registry class with @property-like access:
from contextvars_registry import ContextVarsRegistry
class CurrentVars(ContextVarsRegistry):
locale: str = 'en'
timezone: str = 'UTC'
current = CurrentVars()
# calls ContextVar.get() under the hood
current.timezone # => 'UTC'
# calls ContextVar.set() under the hood
current.timezone = 'GMT'
# ContextVar() methods can be reached via class members
CurrentVars.timezone.get() # => 'GMT'
That makes your code more readable (no more noisy .get() calls),
and it is naturally friendly to typing, so static code analysis features
(like type checkers and auto-completion in your IDE) work nicely.