makkus/dag-cbor

Python implementation of the DAG-CBOR codec for IPLD.

dag-cbor: A Python implementation of the DAG-CBOR codec

This is a fully compliant Python implementation of the DAG-CBOR codec, a subset of the Concise Binary Object Representation (CBOR) supporting the IPLD Data Model and enforcing a unique (strict) encoded representation of items.

Contents

• Install
• Usage
  • Encoding and decoding
  • Random DAG-CBOR data
• API
• Contributing
• License

Install

You can install the latest release from PyPI as follows:

$ pip install --upgrade dag-cbor

Usage

We suggest you import DAG-CBOR as follows:

>>> import dag_cbor

Below are some basic usage examples, to get you started: for detailed documentation, see https://dag-cbor.readthedocs.io/

Encoding and decoding

>>> dag_cbor.encode({'a': 12, 'b': 'hello!'})
b'\xa2aa\x0cabfhello!'
>>> dag_cbor.decode(b'\xa2aa\x0cabfhello!')
{'a': 12, 'b': 'hello!'}

Random DAG-CBOR data

>>> import pprint # pretty-printing
>>> custom_opts = dict(min_codepoint=0x41, max_codepoint=0x5a, include_cid=False)
>>> with dag_cbor.random.options(**custom_opts):
...     for d in dag_cbor.random.rand_dict(3):
...             pprint.pp(d)
...
{'BIQPMZ': b'\x85\x1f\x07/\xcc\x00\xfc\xaa',
 'EJEYDTZI': {},
 'PLSG': {'G': 'JFG',
          'HZE': -61.278,
          'JWDRKRGZ': b'-',
          'OCCKQPDJ': True,
          'SJOCTZMK': False},
 'PRDLN': 39.129,
 'TUGRP': None,
 'WZTEJDXC': -69.933}
{'GHAXI': 39.12,
 'PVUWZLC': 4.523,
 'TDPSU': 'TVCADUGT',
 'ZHGVSNSI': [-57, 9, -78.312]}
{'': 11, 'B': True, 'FWD': {}, 'GXZBVAR': 'BTDWMGI', 'TDICHC': 87}

API

For the full API documentation, see https://dag-cbor.readthedocs.io/

Contributing

Please see CONTRIBUTING.md.

License

MIT © Hashberg Ltd.