Importing ABC directly from collections module was removed in Python 3.9

[Stefan Fleischmann]

I believe the package is currently broken in Ubuntu 22.04 due to the python3 version (3.10). To make the package compatible with Python >=3.9 one needs a patch like this:

 https://github.com/lesscpy/lesscpy/pull/105/commits/0bbcf058e9ca6715c73f8e438529a837476978c3

The upstream bug report: https://github.com/lesscpy/lesscpy/issues/104

How to reproduce:
Download simple css file, e.g.
 $ wget https://gist.githubusercontent.com/eirikbakke/1059266/raw/d81dba46c76169c2b253de0baed790677883c221/gistfile1.css
Then run the module on the file:
 $ python3 -m lesscpy -x gistfile1.css

expected output (works for example with Ubuntu 20.04):
 body{margin:25px;background-color:#f0f0f0;font-family:arial,sans-serif;font-size:14px;}
h1{font-size:35px;font-weight:normal;margin-top:5px;}
.someclass{color:red;}
#someid{color:green;}

Actual output/error:
$ python3 -m lesscpy -x gistfile1.css
Traceback (most recent call last):
  File "/usr/lib/python3.10/runpy.py", line 196, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/usr/lib/python3.10/runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "/usr/lib/python3/dist-packages/lesscpy/__main__.py", line 4, in <module>
    run()
  File "/usr/lib/python3/dist-packages/lesscpy/scripts/compiler.py", line 176, in run
    p.parse(filename=args.target, debuglevel=args.debug)
  File "/usr/lib/python3/dist-packages/lesscpy/lessc/parser.py", line 153, in parse
    self.result = self.parser.parse(
  File "/usr/lib/python3/dist-packages/ply/yacc.py", line 333, in parse
    return self.parseopt_notrack(input, lexer, debug, tracking, tokenfunc)
  File "/usr/lib/python3/dist-packages/ply/yacc.py", line 1120, in parseopt_notrack
    p.callable(pslice)
  File "/usr/lib/python3/dist-packages/lesscpy/lessc/parser.py", line 298, in p_block_open
    p[1].parse(self.scope)
  File "/usr/lib/python3/dist-packages/lesscpy/plib/identifier.py", line 55, in parse
    for n in utility.flatten(self.tokens):
  File "/usr/lib/python3/dist-packages/lesscpy/lessc/utility.py", line 28, in flatten
    if isinstance(elm, collections.Iterable) and not isinstance(elm, string_types):
AttributeError: module 'collections' has no attribute 'Iterable'