Import fails due to missing `decorator` package in clean install

[tmthyln]

Installing hypernetx in a clean virtual environment fails due to a missing package: decorator.

Step to reproduce (after initializing a new empty virtual environment):

pip install hypernetx

giving an error like this:

>>> import hypernetx as hnx
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/tmp/hnx-version/venv/lib/python3.8/site-packages/hypernetx/__init__.py", line 7, in <module>
    from hypernetx.classes import *
  File "/tmp/hnx-version/venv/lib/python3.8/site-packages/hypernetx/classes/__init__.py", line 2, in <module>
    from .hypergraph import Hypergraph
  File "/tmp/hnx-version/venv/lib/python3.8/site-packages/hypernetx/classes/hypergraph.py", line 13, in <module>
    from hypernetx.classes.staticentity import StaticEntity, StaticEntitySet
  File "/tmp/hnx-version/venv/lib/python3.8/site-packages/hypernetx/classes/staticentity.py", line 10, in <module>
    from hypernetx.utils import (
  File "/tmp/hnx-version/venv/lib/python3.8/site-packages/hypernetx/utils/__init__.py", line 8, in <module>
    from .decorators import not_implemented_for
  File "/tmp/hnx-version/venv/lib/python3.8/site-packages/hypernetx/utils/decorators.py", line 4, in <module>
    from decorator import decorator
ModuleNotFoundError: No module named 'decorator'

Of course, installing the decorator package manually fixes the issue and hypernetx imports fine. I think the decorator package should just be added to the install_requires entry in setup.cfg and setup.py since this package is required to even load the package at all.

Tested using Python versions 3.8 and 3.9, using hypernetx 1.2.2 (on Ubuntu).

[bonicim]

@tmthyln Thank you for bringing this to our attention. I also encountered this issue and will address it in the next release.

[bonicim]

Addressed in #91

[bonicim]

v1.2.5 has been uploaded to hypernetx's PyPi account. Closing this issue.