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+# meteor-ejson
+
+[![Build Status](https://travis-ci.org/lyschoening/meteor-ejson-python.svg?branch=master)](https://travis-ci.org/lyschoening/meteor-ejson-python)
+[![PyPI version](https://badge.fury.io/py/meteor-ejson.svg)](http://badge.fury.io/py/meteor-ejson)
+
+A Python implementation of Extended JSON (EJSON) as used in Meteor and DDP.
+
+
+## Installation
+
+    pip install meteor-ejson
+
+Supports Python 2.7, Python 3.x, and PyPy
+
+The `meteor-ejson` Python package is open source under the MIT license.
+
+
+## Usage
+
+
+This implementation piggybacks on the native `json` package by providing a `EJSONEncoder` and a `EJSONDecoder` class. Use either the `ejson.dumps(o)` and `ejson.loads(s)` shortcuts or the built-ins.
+
+	>>> import ejson
+	>>> import datetime
+	>>> ejson.dumps({"createdAt": datetime.date(2010, 10, 10)})
+	'{"createdAt": {"$date": 1286668800000}}'
+	>>>
+	>>> ejson.loads('{"createdAt": {"$date": 1286668800000}}')
+	{'createdAt': datetime.datetime(2010, 10, 10)}
+
+Use with built-in JSON functions:
+
+    import json
+    import ejson
+
+    print(json.loads('{"$binary": "SGVsbG8gd29ybGQh"}', cls=ejson.EJSONDecoder))
+
+### EJSON <-> Python types
+
+| EJSON type    | Python type     |
+| ------------- | --------------- |
+| $date         | `datetime.datetime` (and `datetime.date` when encoding) |
+| $binary       | `str` (Python 2.x; decoding only), `bytes` (Python 3.x) |
+| $type/$value  | *user-specified* |
+
+### Advanced Usage
+
+The EJSON format allows for user-specified types:
+
+	{"$type": TYPENAME, "$value": VALUE}
+
+These can be handled with the `custom_type_hooks` keyword. The encoder expects these hooks as a list of 3-tuples in the format `(cls, type_name, encoder_callback)` and the decoder expects a dict or a list of 2-tuples in the format `(type_name, decoder_callback)`. For example:
+	
+	>>> v = ejson.dumps(set(['a', 'b', 'c']), custom_type_hooks=[(set, 'set', list)])
+	>>> v
+	'{"$value": ["a", "c", "b"], "$type": "set"}'
+	>>> ejson.loads(v, custom_type_hooks=[('set', set)])
+	{'a', 'c', 'b'}
+	
+If the decoder encounters a user-specified type it cannot handle, it raises an `ejson.UnknownTypeError(ValueError)`.
+
+
+## See also
+
+- [Meteor](https://www.meteor.com)
+- [EJSON - Meteor Documentation](http://docs.meteor.com/#/full/ejson)
+- [meteor-ejson NPM package](https://www.npmjs.com/package/meteor-ejson)
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