https://github.com/wyfo/contextclass

Easy typed interface for ContextVar
https://github.com/wyfo/contextclass

Last synced: 7 months ago
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Easy typed interface for ContextVar

• Host: GitHub
• URL: https://github.com/wyfo/contextclass
• Owner: wyfo
• License: mit
• Created: 2019-10-19T16:19:55.000Z (almost 6 years ago)
• Default Branch: master
• Last Pushed: 2020-01-09T17:26:22.000Z (over 5 years ago)
• Last Synced: 2025-01-11T16:13:27.695Z (9 months ago)
• Language: Python
• Size: 9.77 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# contextclasses - Context classes

Context classes provide a typed interface over a [context variable](https://docs.python.org/3/library/contextvars.html#contextvars.ContextVar) dictionary.

It can be used for example to reproduce Flask (thread-local) ["global" context](https://flask.palletsprojects.com/en/1.1.x/appcontext/) in an async web framework.

# Example

```python

import asyncio

from contextclasses import contextclass

async def test_use_case():

    @contextclass

    class Ctx:

        n: int

    async def use_ctx(n: int):

        Ctx.n = n

        await asyncio.sleep(0) # switch context

        return Ctx.n

    values = [*range(5)]

    result = await asyncio.gather(*(use_ctx(n) for n in values))

    assert result == values

```

For more examples, please look at the [tests](tests)