Add an option to drop Python 2 support.

config/README.rst

@@ -116,6 +116,11 @@ The following arguments are supported.
 --with-pypy
   Enable PyPy support. (Only needed one time as it is stored in .meta.cfg.)
 
+--without-legacy-python
+  The package does not support Python versions which reached their end-of-life.
+  (Currently this means dropping support for Python 2.7 and 3.5.) This as well
+  drops support for PyPy2. (Only needed one time as it is stored in .meta.cfg.)
+
 --with-docs
   Enable building the documentation using Sphinx. (Only needed one time as it
   is stored in .meta.cfg.)
@@ -124,6 +129,7 @@ The following arguments are supported.
   Enable running the documentation as doctest using Sphinx. (Only needed one
   time as it is stored in .meta.cfg.)
 
+
 Options
 +++++++
 
@@ -142,7 +148,10 @@ updated. Example:
     with-pypy = False
     with-docs = True
     with-sphinx-doctests = False
+    with-legacy-python = True
     additional-manifest-rules =
+    additional-flake8-config =
+      ignore = D203
 
 
 Meta Options
@@ -162,6 +171,9 @@ fail-under
 with-pypy
   Does the package support PyPy: True/False
 
+with-legacy-python
+  Run the tests even on Python 2.7, PyPy2 and Python 3.5: True/False
+
 with-docs
   Build the documentation via Sphinx: True/False
 
@@ -171,6 +183,11 @@ with-sphinx-doctests
 additional-manifest-rules
   Additional rules to be added at the end of the MANIFEST.in file.
 
+additional-flake8-config
+  Additional configuration options be added at the end of the flake8
+  configuration section in ``setup.cfg``.
+
+
 Hints
 -----
 

config/buildout-recipe/tox.ini.j2

@@ -1,14 +1,18 @@
 [tox]
 envlist =
     lint,
+{% if with_legacy_python %}
     py27,
     py35,
+{% endif %}
     py36,
     py37,
     py38,
     py39,
-{% if with_pypy %}
+{% if with_pypy and with_legacy_python %}
     pypy,
+{% endif %}
+{% if with_pypy %}
     pypy3,
 {% endif %}
 {% if with_docs %}

config/config-package.py

@@ -37,7 +37,7 @@ def copy_with_meta(template_name, destination, config_type, **kw):
     with open(destination, 'w') as f_:
         f_.write(META_HINT.format(config_type=config_type))
         template = jinja_env.get_template(template_name)
-        f_.write(template.render(**kw))
+        f_.write(template.render(config_type=config_type, **kw))
 
 
 parser = argparse.ArgumentParser(
@@ -55,6 +55,14 @@ def copy_with_meta(template_name, destination, config_type, **kw):
     action='store_true',
     default=False,
     help='Activate PyPy support if not already configured in .meta.cfg.')
+parser.add_argument(
+    '--without-legacy-python',
+    dest='with_legacy_python',
+    action='store_false',
+    default=None,
+    help='Disable support for Python versions which reached their end-of-life.'
+    ' (aka 2.7 and 3.5) if not already configured in .meta.cfg.'
+    ' Also disables support for PyPy2.')
 parser.add_argument(
     '--with-docs',
     dest='with_docs',
@@ -118,14 +126,23 @@ def copy_with_meta(template_name, destination, config_type, **kw):
     'git', 'log', '-n1', '--format=format:%H', capture_output=True).stdout
 with_pypy = meta_opts.getboolean('with-pypy', False) or args.with_pypy
 meta_opts['with-pypy'] = str(with_pypy)
+if args.with_legacy_python is None:
+    with_legacy_python = meta_opts.getboolean('with-legacy-python', True)
+else:
+    with_legacy_python = args.with_legacy_python
+meta_opts['with-legacy-python'] = str(with_legacy_python)
 with_docs = meta_opts.getboolean('with-docs', False) or args.with_docs
 meta_opts['with-docs'] = str(with_docs)
 with_sphinx_doctests = meta_opts.getboolean(
     'with-sphinx-doctests', False) or args.with_sphinx_doctests
 meta_opts['with-sphinx-doctests'] = str(with_sphinx_doctests)
 
 # Copy template files
-copy_with_meta('setup.cfg', path / 'setup.cfg', config_type)
+additional_flake8_config = meta_opts.get(
+    'additional-flake8-config', '').strip()
+copy_with_meta('setup.cfg.j2', path / 'setup.cfg', config_type,
+               additional_flake8_config=additional_flake8_config,
+               with_docs=with_docs, with_sphinx_doctests=with_sphinx_doctests)
 copy_with_meta('editorconfig', path / '.editorconfig', config_type)
 copy_with_meta('gitignore', path / '.gitignore', config_type)
 workflows = path / '.github' / 'workflows'
@@ -146,10 +163,12 @@ def copy_with_meta(template_name, destination, config_type, **kw):
 copy_with_meta(
     'tox.ini.j2', path / 'tox.ini', config_type,
     fail_under=fail_under, with_pypy=with_pypy,
+    with_legacy_python=with_legacy_python,
     with_docs=with_docs, with_sphinx_doctests=with_sphinx_doctests)
 copy_with_meta(
     'tests.yml.j2', workflows / 'tests.yml', config_type,
-    with_pypy=with_pypy, with_docs=with_docs)
+    with_pypy=with_pypy, with_legacy_python=with_legacy_python,
+    with_docs=with_docs)
 
 
 # Modify MANIFEST.in with meta options

config/buildout-recipe/setup.cfg → config/default/setup.cfg.j2

@@ -3,12 +3,21 @@ universal = 1
 
 [flake8]
 doctests = 1
+{% if config_type == 'buildout-recipe' %}
 # provided to doctests by buildoutSetUp()
 builtins = write, system, cat, join
+{% endif %}
+{% if additional_flake8_config %}
+%(additional_flake8_config)s
+{% endif %}
 
 [check-manifest]
 ignore =
     .editorconfig
     .meta.cfg
+{% if with_docs %}
     docs/_build/html/_sources/*
+{% endif %}
+{% if with_sphinx_doctests %}
     docs/_build/doctest/*
+{% endif %}

config/default/tests.yml.j2

@@ -14,14 +14,18 @@ jobs:
         config:
         # [Python version, tox env]
         - ["3.8",   "lint"]
+{% if with_legacy_python %}
         - ["2.7",   "py27"]
         - ["3.5",   "py35"]
+{% endif %}
         - ["3.6",   "py36"]
         - ["3.7",   "py37"]
         - ["3.8",   "py38"]
         - ["3.9",   "py39"]
-{% if with_pypy %}
+{% if with_pypy and with_legacy_python %}
         - ["pypy2", "pypy"]
+{% endif %}
+{% if with_pypy %}
         - ["pypy3", "pypy3"]
 {% endif %}
 {% if with_docs %}

config/pure-python/packages.txt

@@ -17,3 +17,4 @@ grokcore.component
 zc.relationship
 bobo
 megrok.strictrequire
+importchecker

config/pure-python/tox.ini.j2

@@ -1,14 +1,18 @@
 [tox]
 envlist =
     lint,
+{% if with_legacy_python %}
     py27,
     py35,
+{% endif %}
     py36,
     py37,
     py38,
     py39,
-{% if with_pypy %}
+{% if with_pypy and with_legacy_python %}
     pypy,
+{% endif %}
+{% if with_pypy %}
     pypy3,
 {% endif %}
 {% if with_docs %}