Use react's context API in python!

context.py

from contextlib import contextmanager
import threading

def use_context(context):
  with context.consumer() as value:
    return value

class Context(threading.local):
  def __init__(self, default = None):
    self.value = default

  @contextmanager
  def provider(self, value):
    old_value = self.value
    self.value = value
    yield
    self.value = old_value
  
  @contextmanager
  def consumer(self):
    yield self.value

create_context = Context

main.py

from context import create_context, use_context

ctx = create_context(123)

def inner_fn():
  with ctx.consumer() as value:
    print(f"inner_fn: value = {value}")

def some_fn():
  value = use_context(ctx)
  print(f"some_fn: value = {value}")
  with ctx.provider(12):
    inner_fn()
  print(f"some_fn: value = {value}")


some_fn()