ImportError: cannot import name 'cached_property'

When running the first snippet of code in the README saved as a .py file to get the WorkID. I get an error message that it cannot import from functools.

The resulting error message occurs regardless of if I run it from the ao3_api or AO3 directory.

Fresh Ubuntu 18.04 LTS in VirtualBox.

(project) ao3dude@ao3dude-VirtualBox:~/project$ python3 ~/project/ao3_api/snippet.py 
Traceback (most recent call last):
  File "/home/ao3dude/project/ao3_api/snippet.py", line 1, in <module>
    import AO3
  File "/home/ao3dude/project/ao3_api/AO3/__init__.py", line 2, in <module>
    from .comments import Comment
  File "/home/ao3dude/project/ao3_api/AO3/comments.py", line 5, in <module>
    from .users import User
  File "/home/ao3dude/project/ao3_api/AO3/users.py", line 2, in <module>
    from functools import cached_property
ImportError: cannot import name 'cached_property'

Here are the commands I used to setup the environment:

# Update the OS software and grab some Python packages. 
sudo apt update && sudo apt upgrade -y
sudo apt install python3-dev python3-pip python3-venv git

# Make a directory and start a Python virtual environment in it.
mkdir projectfolder 
python3 -m venv --system-site-packages projectfolder/
source projectfolder/bin/activate

# Move in to the folder, get some needed Python modules and clone the git.
cd projectfolder/
pip install --upgrade pip setuptools
git clone https://github.com/ArmindoFlores/ao3_api.git

[ArmindoFlores]

Also as a side note, I’m working on removing the use of cached_property altogether, because using it forces me to store the soup object instead of just calculating everything at load time, and that then makes a pickled Work, Series or Session object very big and much more complex than it needed to be.

[ArmindoFlores]

You can try to install this python package using pip install cached-property and replacing all instances of from functools import cached_property with from cached_property import cached_property. However, I don’t recommend this and I think you’d be better off just upgrading to python 3.8