Overview

infi.dtypes.wwn provides a datatype for representing WWNs from strings in various formats.

Usage

WWN accepts an optional 0x prefix and either : or - as the group separator. Whatever the input form, the address is normalized to sixteen lowercase hex digits, so values parsed from different formats compare equal:

>>> from infi.dtypes.wwn import WWN
>>> wwn = WWN("01:02:03:04:ab:cd:ef:08")
>>> wwn
01020304abcdef08
>>> wwn == "01-02-03-04-AB-CD-EF-08"
True
>>> wwn == "0x01020304abcdef08"
True

Short addresses are left-padded to the full width:

>>> WWN("1")
0000000000000001

Instances are hashable and orderable, so they can be used as dictionary keys and sorted. Comparing against a string that cannot be parsed yields False rather than raising:

>>> wwn == "not-a-wwn"
False

Equality is supported against strings and other WWN instances only. Comparing a WWN against an integer returns False.

Installing

pip install infi.dtypes.wwn

Requires Python 3.3 or later. infi and infi.dtypes are PEP 420 implicit namespace packages, so they contain no __init__.py.

Checking out the code

git clone https://github.com/Infinidat/infi.dtypes.wwn.git
cd infi.dtypes.wwn
pip install --editable .

Running the tests

python -m unittest discover -s tests -v