Remove Python 2.7 implementations and dependencies

This is a big preparation step before releasing v3.0.0.

README.rst

@@ -99,33 +99,31 @@ Installation
 
     $ pip install pyclean
 
+or
+
+.. code:: console
+
+    $ python -m pip install pyclean
+
 Usage
 =====
 
 .. code:: console
 
     $ pyclean --help
 
-If you want to explicitly operate the Debian-specific implementation:
+or
 
 .. code:: console
 
-    $ py2clean --help
-    $ py3clean --help
-    $ pypyclean --help
+    $ python -m pyclean --help
 
 Clean up all bytecode in the current directory tree, and explain verbosely:
 
 .. code:: console
 
     $ pyclean -v .
 
-Clean up all bytecode for a Debian package: (may require root permissions)
-
-.. code:: console
-
-    $ pyclean -p python3-keyring --legacy
-
 Clean up debris
 ---------------
 
@@ -162,8 +160,8 @@ reason, the ``--erase`` option has a few artificial constraints:
 - The above entails that you're responsible for the deletion order, i.e.
   removal of a directory will only work if you asked to delete all files
   inside first.
-- You're prompted interactively to confirm deletion, unless you add the
-  ``--yes`` option, in addition.
+- You're prompted interactively to confirm deletion, unless you specify
+  the ``--yes`` option, in addition.
 
 .. code:: console
 
@@ -201,14 +199,3 @@ Development
 If you want to help out please see our `contribution guide`_.
 
 .. _contribution guide: https://github.com/bittner/pyclean/blob/main/CONTRIBUTING.md
-
-Roadmap (for v3.0.0)
---------------------
-
-#. Replace original Debian scripts (current ``--legacy``) by a single,
-   pure Python, Python 3-only code base that serves all target platforms.
-#. Reduce the package dependencies to an absolute minimum for maximum
-   portability.
-#. Add additional CLI options to delete debris from builds, testing and
-   packaging (build/, .cache/, dist/, .pytest_cache/, .tox/ and
-   free-form targets).

pyclean/__init__.py

@@ -2,4 +2,4 @@
 Pure Python cross-platform pyclean. Clean up your Python bytecode.
 """
 
-__version__ = '2.7.6'
+__version__ = '3.0.0rc1'

pyclean/cli.py

@@ -12,7 +12,7 @@
 
 def parse_arguments():
     """
-    Parse and handle CLI arguments
+    Parse and handle CLI arguments.
     """
     debris_default_topics = ['cache', 'coverage', 'package', 'pytest', 'ruff']
     debris_optional_topics = ['jupyter', 'mypy', 'tox']
@@ -35,23 +35,9 @@ def parse_arguments():
         parser.register('action', 'extend', compat.ExtendAction)
 
     parser.add_argument('--version', action='version', version=__version__)
-    parser.add_argument(
-        '-V',
-        metavar='VERSION',
-        dest='version',
-        help='specify Python version to clean',
-    )
-    parser.add_argument(
-        '-p',
-        '--package',
-        metavar='PACKAGE',
-        action='append',
-        default=[],
-        help='Debian package to byte-compile (may be specified multiple times)',
-    )
     parser.add_argument(
         'directory',
-        nargs='*',
+        nargs='+',
         help='directory tree to traverse for byte-code',
     )
     parser.add_argument(
@@ -89,11 +75,6 @@ def parse_arguments():
         help='delete files or folders matching a globbing pattern (may be specified'
         ' multiple times); this will be interactive unless --yes is used.',
     )
-    parser.add_argument(
-        '--legacy',
-        action='store_true',
-        help='use legacy Debian implementation (autodetect)',
-    )
     parser.add_argument(
         '-n',
         '--dry-run',
@@ -123,10 +104,6 @@ def parse_arguments():
     if args.yes and not args.erase:
         parser.error('Specifying --yes only makes sense with --erase.')
 
-    if not (args.package or args.directory):
-        msg = 'A directory (or files) or a list of packages must be specified.'
-        parser.error(msg)
-
     if 'debris' in args:
         if 'all' in args.debris:
             args.debris = debris_default_topics + debris_optional_topics
@@ -152,39 +129,13 @@ def init_logging(args):
     logging.basicConfig(level=log_level, format=log_format)
 
 
-def main(override=None):
+def main():
     """
-    Entry point for all scripts
+    Entry point for CLI application.
     """
     args = parse_arguments()
-    if override or args.legacy:
-        impl = compat.get_implementation(override=override)
-        pyclean_main = impl.main
-    else:
-        pyclean_main = modern.pyclean
 
     try:
-        pyclean_main(args)
+        modern.pyclean(args)
     except Exception as err:
         raise SystemExit(err)
-
-
-def py2clean():
-    """
-    Forces the use of the implementation for Python 2
-    """
-    main('CPython2')
-
-
-def py3clean():
-    """
-    Forces the use of the implementation for Python 3
-    """
-    main('CPython3')
-
-
-def pypyclean():
-    """
-    Forces the use of the implementation for PyPy (2+3)
-    """
-    main('PyPy2')

pyclean/compat.py

@@ -1,31 +1,7 @@
 """
 Cross-Python version compatibility.
 """
-import platform
-import sys
 from argparse import _AppendAction as AppendAction
-from importlib import import_module
-
-
-def get_implementation(override=None):
-    """
-    Detect the active Python version and return a reference to the
-    module serving the version-specific pyclean implementation.
-    """
-    implementation = dict(
-        CPython2='pyclean.py2clean',
-        CPython3='pyclean.py3clean',
-        PyPy2='pyclean.pypyclean',
-        PyPy3='pyclean.pypyclean',
-    )
-
-    detected_version = '%s%s' % (
-        platform.python_implementation(),
-        sys.version_info.major,
-    )
-
-    module_name = implementation[override if override else detected_version]
-    return import_module(module_name)
 
 
 class ExtendAction(AppendAction):

pyclean/modern.py

@@ -2,13 +2,7 @@
 Modern, cross-platform, pure-Python pyclean implementation.
 """
 import logging
-
-try:
-    from pathlib import Path
-except ImportError:  # Python 2.7, PyPy2
-    from warnings import warn
-
-    warn('Python 3 required for modern implementation. Python 2 is obsolete.')
+from pathlib import Path
 
 BYTECODE_FILES = ['.pyc', '.pyo']
 BYTECODE_DIRS = ['__pycache__']