Improve tox environment name parsing

Closes #38, #50.

Author: mgedmin

CHANGES.rst

@@ -4,7 +4,10 @@ Changelog
 0.24.1 (unreleased)
 -------------------
 
-- Nothing changed yet.
+- Improve tox environment name parsing: accept dotted names (e.g. py3.14),
+  more specific pypy versions (pypy311).  `GH #38
+  <https://github.com/mgedmin/check-python-versions/issues/38>`_ and `GH #50
+  <https://github.com/mgedmin/check-python-versions/issues/50>`_.
 
 
 0.24.0 (2025-11-13)

src/check_python_versions/sources/tox.py

@@ -101,14 +101,18 @@ def tox_env_to_py_version(env: str) -> Version | None:
 
     If the environment name has dashes, only the first part is considered,
     e.g. py34-django20 becomes '3.4', and jython-docs becomes 'jython'.
+    (This is probably incorrect, I think tox itself allows the Python
+    factor to be in any position, e.g. orange-py3.11.)
     """
     if '-' in env:
         # e.g. py34-coverage, pypy-subunit
         env = env.partition('-')[0]
-    if env.startswith('pypy'):
-        return Version.from_string('PyPy' + env[4:])
-    elif env.startswith('py') and len(env) >= 4 and env[2:].isdigit():
-        return Version.from_string(f'{env[2]}.{env[3:]}')
+    if env.startswith('pypy3'):
+        return Version.from_string('PyPy3')
+    if env == 'pypy' or env.startswith('pypy2'):
+        return Version.from_string('PyPy')
+    elif m := re.match(r'^py([2-3])[.]?([0-9]+)t?$', env):
+        return Version.from_string(f'{m[1]}.{m[2]}')
     else:
         return None
 

tests/sources/test_tox.py

@@ -91,9 +91,16 @@ def test_brace_expand(s, expected):
 @pytest.mark.parametrize('s, expected', [
     ('py36', '3.6'),
     ('py37-lint', '3.7'),
-    ('py310', '3.10'),  # future-proofness!
+    ('py3.9', '3.9'),
+    ('py310', '3.10'),
+    ('py3.10', '3.10'),
+    ('py314t', '3.14'),
+    ('py3.14t', '3.14'),
     ('pypy', 'PyPy'),
+    ('pypy2', 'PyPy'),
     ('pypy3', 'PyPy3'),
+    ('pypy311', 'PyPy3'),
+    ('pypy3.11', 'PyPy3'),
     ('pylint', None),
     ('flake8', None),
 ])