bases: A Python library for Base-N encodings

Bases provides a customisable, parametric implementation of several common styles of Base-N encoding, covering all cases appearing in the multibase specification (except for proquints).

Contents

• Install
• Usage
  • Base encoding objects
  • Encoding
  • Decoding
  • Case/padding variations
  • Case sensitivity variations
  • Custom base encodings
• API
• Contributing
• License

Install

You can install the latest release from PyPI as follows:

$ pip install --upgrade bases

Usage

We suggest you import bases as follows:

>>> import bases

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

Base encoding objects

>>> from bases import base32
>>> base32
FixcharBaseEncoding(
    StringAlphabet('ABCDEFGHIJKLMNOPQRSTUVWXYZ234567',
                   case_sensitive=False),
    pad_char='=', padding='include')

Encoding

>>> b = bytes([70, 98, 190, 187, 66, 224, 178])
>>> base32.encode(b)
'IZRL5O2C4CZA===='

Decoding

>>> s = 'IZRL5O2C4CZA===='
>>> base32.decode(s)
b'Fb\xbe\xbbB\xe0\xb2'
>>> list(base32.decode(s))
[70, 98, 190, 187, 66, 224, 178]

Case/padding variations

>>> b = bytes([70, 98, 190, 187, 66, 224, 178])
>>> base32.encode(b)
'IZRL5O2C4CZA===='
>>> base32lower = base32.lower()
>>> base32lower
FixcharBaseEncoding(
    StringAlphabet('abcdefghijklmnopqrstuvwxyz234567',
                   case_sensitive=False),
    pad_char='=', padding='include')
>>> base32lower.encode(b)
'izrl5o2c4cza===='
>>> base32nopad = base32.nopad()
>>> base32nopad.encode(b)
'IZRL5O2C4CZA'

Case sensitivity variations

>>> s = 'IZRL5O2C4CZA===='
>>> base32lower.decode(s)
b'Fb\xbe\xbbB\xe0\xb2'
>>> base32lower_casesensitive = base32lower.with_case_sensitivity(True)
>>> base32lower_casesensitive.decode(s)
bases.encoding.errors.NonAlphabeticCharError: Invalid character 'I'
encountered for alphabet StringAlphabet('abcdefghijklmnopqrstuvwxyz234567').

Custom base encodings

>>> base4 = bases.make("0123", kind="zeropad-enc", block_nchars=4)
>>> base4
ZeropadBaseEncoding(StringAlphabet('0123'), block_nchars=4)

API

For the full API documentation, see https://bases.readthedocs.io/

Contributing

Please see CONTRIBUTING.md.

License

MIT © Hashberg Ltd.