Restore Python 3.7 compatibility by not using functools.cached_property.

[mauritsvanrees]

Note that Python 3.7 is end of life, and this add-on is not tested on it. But this was an easy fix.

[ksuess]

Let's update setup.py with a python_requires=">=3.8" according the classifiers and that Python 3.7 has reached its end of life.

[mauritsvanrees]

Let's update setup.py with a python_requires=">=3.8" according the classifiers and that Python 3.7 has reached its end of life.

The problem I see with such a change, is that this makes it impossible to install this package on Python 3.7, even though it would actually work, after this PR anyway.

In core Plone I am inclined to use the classifiers for the versions that we recommend, and to keep python_requires more lenient. For example, in Products.CMFPlone on branch 5.2.x, the setup.py has classifiers only for Python 2.7 and 3.8, but python_requires still accepts Python 3.6 and 3.7.

But if you still prefer, I am happy to change it here.

In fact, I would be happy to drop Plone 5.2 support.

[ksuess]

Let's update setup.py with a python_requires=">=3.8" according the classifiers and that Python 3.7 has reached its end of life.

The problem I see with such a change, is that this makes it impossible to install this package on Python 3.7, even though it would actually work, after this PR anyway.

In core Plone I am inclined to use the classifiers for the versions that we recommend, and to keep python_requires more lenient. For example, in Products.CMFPlone on branch 5.2.x, the setup.py has classifiers only for Python 2.7 and 3.8, but python_requires still accepts Python 3.6 and 3.7.

But if you still prefer, I am happy to change it here.

Ah, OK, now I am aware that it in fact makes sense to use the classifiers for recommendations. But keep the range of required versions wider. Thanks for the hint. I retract my change request.

[ksuess]

In fact, I would be happy to drop Plone 5.2 support.

+1 from me.

[mauritsvanrees]

I have released 2.1.1 with this fix.
We can see about dropping 5.2 support later.