Installation With Python >=3.9 Fails ('HTMLParser' object has no attribute 'unescape')

[b0ssi]

Rez version

2.69.6

Platform and Operating System

• Python-3.9
• Arch Linux

Contextual Information

I'm attempting to install rez.

Simplest possible steps to reproduce.

Using an environment with Python >=3.9 installed, attempt a manual install:

$ tar -xazvf 2.69.6.tar.gz
$ cd rez-2.69.6
$ python ./install.py

Expected Result

Successful installation

Actual Result

Installation fails with the following:

ERROR: Complete output from command python setup.py egg_info:
ERROR: Traceback (most recent call last):
    File "<string>", line 1, in <module>
    File "/opt/rez/lib/python3.9/site-packages/setuptools/__init__.py", line 20, in <module>
        from setuptools.dist import Distribution, Feature
    File "/opt/rez/lib/python3.9/site-packages/setuptools/dist.py", line 34, in <module>
        from setuptools.depends import Require
    File "/opt/rez/lib/python3.9/site-packages/setuptools/depends.py", line 7, in <module>
        from .py33compat import Bytecode
    File "/opt/rez/lib/python3.9/site-packages/setuptools/py33compat.py", line 55, in <module>
        unescape = getattr(html, 'unescape', html_parser.HTMLParser().unescape)
AttributeError: 'HTMLParser' object has no attribute 'unescape'
----------------------------------------
ERROR: Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-req-build-w0ivy6a5/
WARNING: You are using pip version 19.1.1, however version 20.3.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
[...]

The reason seems to be rez being bundled with setuptools-41.0.1-py2.py3-none-any (and pip-19.1.1), which is now incompatible with Python-3.9 (and above), as HTMLParser.unescape got removed in Python-3.9.

[nerdvegas]

I highly suspect that the best fix for this will be #982

[b0ssi]

That sounds like it should fix the issue, if it's instead using the local venv environment that corresponds with the Python installation that gets picked up.

[b0ssi]

This has been working for a while now since, thanks 👍