python-future-then

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python-future-then

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Extension to Python's Future (Promise) API that allows chaining using .then() (like JavaScript Promises)

python-future-then 최신버젼 다운로드

최종 버전 다운로드 (.zip)

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## WHAT & WHY

Extending Python's `concurrent.futures.Future` (Promise) object with missing chaining API like `.then()`.

While Futures (aka Promises) [are formally specified and available](https://www.python.org/dev/peps/pep-3148/) as part of Python as of v 3.2+,
and is available as [backported module for Python versions v.2.x](https://pypi.python.org/pypi/futures),
standard implementation is lacking any formal or convenient API for the most frequent use of Promises - chaining.

[JavaScript Promises/A+ API](https://github.com/promises-aplus/promises-spec) have then-ability as part of the spec.
This project takes standard `concurrent.futures.Future` Python class and extends it with borrowed `.then()` behavior from [JavaScript Promises](https://github.com/promises-aplus/promises-spec).

## INSTALL

`pip install futures_then`

## USE

```python
In [1]: from futures_then import ThenableFuture as Future

In [2]: f1 = Future()

In [3]: f2 = f1.then(lambda v: v + ' transformed')

In [4]: f1.set_result('future')

In [5]: f2.result()
Out[5]: 'future transformed'
```

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