PYTHON: Fix "tox" for Python 2.7 (#50)

* Fixes a problem in DEVELOPMENT support
* Problem seems to be related to macOS 12 Monterey
  SEE: pypa/virtualenv#2284
* Use special section in "tox.ini" and
  use "pip install --user ..." to fix the problem for now.
* ADDED: "py27" to "envlist" again.

python/tox.ini

@@ -22,8 +22,8 @@
 
 [tox]
 minversion   = 2.8
-envlist      = py310, py39, pypy3
-skip_missing_interpreters = True
+envlist      = py310, py27, py39, pypy3
+skip_missing_interpreters = true
 
 
 # -----------------------------------------------------------------------------
@@ -39,19 +39,12 @@ passenv =
      PYTHONPATH = {toxinidir}
 
 
-# -- SPECIAL CASE: pytest script does not seem to be installed.
+# -- SPECIAL CASE:Script(s) do not seem to be installed.
+# RELATED: https://github.com/pypa/virtualenv/issues/2284 -- macOS 12 Monterey related
 # NOTES:
-#  * Python 2.7 seems to be broken in tox (due to: pip)
-#    THEREFORE: Remove from "envlist" above for now.
-#  * I can still run tests in own virtual-environment.
-#
-# VIRTUAL-ENVIRONMENT SETUP PROCEDURE:
-#   virtualenv -p python2.7 .venv_py27
-#   source .venv_py27
-#   scripts/ensurepip_python27.sh
-#   python -mpip install -r py.requirements/basic.txt
-#   python -mpip install -r py.requirements/testing.txt
+#  * pip-install seems to need "--user" option.
 [testenv:py27]
+install_command = pip install --user -U {opts} {packages}
 changedir = {toxinidir}
 commands=
     python -mpytest {posargs:tests}
@@ -61,6 +54,13 @@ passenv =
      PYTHONPATH = {toxinidir}
 # MAYBE: allowlist_externals = curl
 
+# -- VIRTUAL-ENVIRONMENT SETUP PROCEDURE: For python 2.7
+#   virtualenv -p python2.7 .venv_py27
+#   source .venv_py27
+#   scripts/ensurepip_python27.sh
+#   python -mpip install -r py.requirements/basic.txt
+#   python -mpip install -r py.requirements/testing.txt
+
 
 [testenv:devenv]
 # basepython = python2.7