wrong version of matplotlib?

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TypeError Traceback (most recent call last)
Cell In[27], line 1
----> 1 import cmocean

File ~/opt/anaconda3/lib/python3.9/site-packages/cmocean/__init__.py:11
8 from __future__ import absolute_import
10 # from cmocean import *
---> 11 from . import cm, tools, data
13 __all__ = ['cm',
14 'tools',
15 'plots',
16 'data']
18 __authors__ = ['Kristen Thyng ']

File ~/opt/anaconda3/lib/python3.9/site-packages/cmocean/cm.py:34
30 cmap_d = dict()
33 # a comparable version object
---> 34 MPL_VERSION = Version(version("matplotlib"))
36 def _register_cmap(cmap, *, name):
37 # wrap matplotlib.cm API, use non-deprecated API when available
38 if MPL_VERSION >= Version("3.5"):

File ~/opt/anaconda3/lib/python3.9/site-packages/packaging/version.py:196, in Version.__init__(self, version)
185 """Initialize a Version object.
186
187 :param version:
(...)
192 exception will be raised.
193 """
195 # Validate the version and parse it into pieces
--> 196 match = self._regex.search(version)
197 if not match:
198 raise InvalidVersion(f"Invalid version: '{version}'")

TypeError: expected string or bytes-like object

Reproduce the import failure in the Python 3.9 Anaconda environment shown, then inspect cmocean/cm.py around the MPL_VERSION assignment and the matplotlib version lookup. Done means importing cmocean no longer raises the reported TypeError with the relevant matplotlib installation.

Written by the indexing model from the issue text.