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Documentation: Add README and example config.
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======
Introduction
------------
oxrlib provides a Python library and CLI tool to query the `Open Exchange Rates API <https://openexchangerates.org/>`_. It emphasizes support for rich data types throughout, and supports caching API results to the filesystem.
It currently only supports OXR's "historical" API.
Getting started with the CLI tool
---------------------------------
oxrlib includes an `oxrquery` tool to access the OXR API directly from the command line. By default, it reads your OXR credentials and other common configuration from `~/.config/oxrlib.ini`. Copy `oxrlib_example.ini` from the source to `~/.config/oxrlib.ini`, then edit that file following the instructions in the comments.
Run `oxrquery --help` for instructions to use the tool.
Getting started with the library
--------------------------------
Here's an example of using the Python library, complete with caching results:
from oxrlib import cache, loaders, rate
filename_format = '{date}_{base}_rates.json'
cache_writer = cache.CacheWriter(DIR_PATH, historical=filename_format)
loader = loaders.LoaderChain()
loader.add_loader(loaders.FileCache(DIR_PATH, historical=filename_format))
loader.add_loader(loaders.OXRAPIRequest(APP_ID_STRING))
with loader.historical(DATE, BASE_CODE_STRING) as json_response:
hist_rate = rate.Rate.from_json_file(json_response)
if loader.should_cache():
cache_writer.save_rate(hist_rate)
# Rates are available from the hist_rates.rates dict.
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