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effect-examples
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Examples for using Effect
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README.md
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effect-examples
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# Effect Examples This repository contains examples of using Effect. They demonstrate basic use of Effect to isolate side-effects from code, but also to provide alternative implementations of those side-effecting actions without requiring changes to core application logic. This package isn't meant to be installed, but rather just copied to your local dev environment and tinkered with. To install dependencies use ``pip install -r requirements.txt``. ## ehttp The [`ehttp`](ehttp) directory contains a very simple `HTTPRequest` intent and performers using common HTTP client libraries: [requests](http://warehouse.python.org/project/requests/) and [treq](https://warehouse.python.org/project/treq/). treq is a Twisted-based library, showing that Effect can be used (with the additional [txeffect](https://github.com/python-effect/txeffect) package) to write generic code that can use either Twisted-based asynchronous IO or normal blocking IO. Other asynchronous frameworks (such as Python 3's ``asyncio``) could also be used in this way. ## readline_intent The [`readline_intent.py`](readline_intent.py) file has a simple `ReadLine` intent that uses `raw_input` (or `input` in Py3) to prompt the user for input. ## github The `github` directory contains a simple application that lets the user input a GitHub username and prints out a list of all repositories that that user has access to. It depends on the `ehttp` and `readline_intent` modules. Note that if you run this example too rapidly, GitHub might temporarily block your IP from making anonymous API requests for some short period of time. There are two entrypoints into the example: [`github.sync_main`](github/sync_main.py) and [`github.twisted_main`](github/twisted_main.py). `sync_main` does typical blocking IO, and `twisted_main` uses asynchronous IO. Note that the vast majority of the code doesn't need to care about this difference; the only part that cares about it is the `*_main.py` files. All of the logic in [`core.py`](github/core.py) is generic. To run them: python -m github.sync_main or python -m github.twisted_main Note that the twisted example does not run on Python 3, but all other examples do. The github example app has unit tests in [`test_core.py`](github/test_core.py). They can be discovered and run simply by running ``py.test`` in the top-level directory.
