tools: drop Python 2.7/3.4-3.9 remnants; fix download_cef copyright year

- installer/cefpython3.__init__.py: load only Python 3.10-3.14 modules
  (removed the 2.7/3.4-3.9 dispatch branches; updated example paths)
- installer/cefpython3.setup.py: drop unsupported Python classifiers
- download_cef.py: copyright year 2017 -> 2026 (new file)

Addresses review feedback on PR cztomczak#691 (cztomczak/cefpython).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: linesight

tools/download_cef.py

@@ -1,4 +1,4 @@
-# Copyright (c) 2017 CEF Python, see the Authors file.
+# Copyright (c) 2026 CEF Python, see the Authors file.
 # All rights reserved. Licensed under BSD 3-clause license.
 # Project website: https://github.com/cztomczak/cefpython
 

tools/installer/cefpython3.__init__.py

@@ -17,10 +17,10 @@
 
 # If package was installed using PIP or setup.py then package
 # dir is here:
-#   /usr/local/lib/python2.7/dist-packages/cefpython3/
+#   /usr/local/lib/python3.10/dist-packages/cefpython3/
 
 # If this is a debian package then package_dir returns:
-#   /usr/lib/pymodules/python2.7/cefpython3
+#   /usr/lib/pymodules/python3.10/cefpython3
 # The above path consists of symbolic links to the real directory:
 #   /usr/share/pyshared/cefpython3
 
@@ -49,28 +49,7 @@
     ctypes.CDLL(libcef, ctypes.RTLD_GLOBAL)
 
 # Load the cefpython module for given Python version
-if sys.version_info[:2] == (2, 7):
-    # noinspection PyUnresolvedReferences
-    from . import cefpython_py27 as cefpython
-elif sys.version_info[:2] == (3, 4):
-    # noinspection PyUnresolvedReferences
-    from . import cefpython_py34 as cefpython
-elif sys.version_info[:2] == (3, 5):
-    # noinspection PyUnresolvedReferences
-    from . import cefpython_py35 as cefpython
-elif sys.version_info[:2] == (3, 6):
-    # noinspection PyUnresolvedReferences
-    from . import cefpython_py36 as cefpython
-elif sys.version_info[:2] == (3, 7):
-    # noinspection PyUnresolvedReferences
-    from . import cefpython_py37 as cefpython
-elif sys.version_info[:2] == (3, 8):
-    # noinspection PyUnresolvedReferences
-    from . import cefpython_py38 as cefpython
-elif sys.version_info[:2] == (3, 9):
-    # noinspection PyUnresolvedReferences
-    from . import cefpython_py39 as cefpython
-elif sys.version_info[:2] == (3, 10):
+if sys.version_info[:2] == (3, 10):
     # noinspection PyUnresolvedReferences
     from . import cefpython_py310 as cefpython
 elif sys.version_info[:2] == (3, 11):

tools/installer/cefpython3.setup.py

@@ -143,13 +143,6 @@ def main():
             "Operating System :: MacOS :: MacOS X",
             "Operating System :: Microsoft :: Windows",
             "Operating System :: POSIX :: Linux",
-            "Programming Language :: Python :: 2.7",
-            "Programming Language :: Python :: 3.4",
-            "Programming Language :: Python :: 3.5",
-            "Programming Language :: Python :: 3.6",
-            "Programming Language :: Python :: 3.7",
-            "Programming Language :: Python :: 3.8",
-            "Programming Language :: Python :: 3.9",
             "Programming Language :: Python :: 3.10",
             "Programming Language :: Python :: 3.11",
             "Programming Language :: Python :: 3.12",