Replace imp.load_source() (#204)

hdfs/config.py

@@ -15,21 +15,27 @@
 from logging.handlers import TimedRotatingFileHandler
 from six.moves.configparser import ParsingError, RawConfigParser
 from tempfile import gettempdir
+import importlib.util
+import importlib.machinery
 import logging as lg
 import os
 import os.path as osp
 import sys
 
-try:
-  # Python 3.12 and above
-  from importlib import load_source
-except ImportError:
-  # Below Python 3.12
-  from imp import load_source
-
 _logger = lg.getLogger(__name__)
 
 
+def _load_source(modname, filename):
+  """Imitate the old imp.load_source() function, removed in Python 3.12"""
+  # Based on sample code in https://docs.python.org/3.12/whatsnew/3.12.html.
+  loader = importlib.machinery.SourceFileLoader(modname, filename)
+  spec = importlib.util.spec_from_file_location(modname, filename, loader=loader)
+  module = importlib.util.module_from_spec(spec)
+  sys.modules[module.__name__] = module
+  loader.exec_module(module)
+  return module
+
+
 class NullHandler(lg.Handler):
 
   """Pass-through logging handler.
@@ -177,7 +183,7 @@ def _load(suffix, loader):
 
 
     _load('modules', __import__)
-    _load('paths', lambda path: load_source(
+    _load('paths', lambda path: _load_source(
       osp.splitext(osp.basename(path))[0],
       path
     ))

test/test_examples.py

@@ -4,19 +4,13 @@
 """Test that the examples run correctly."""
 
 from hdfs import Config
+from hdfs.config import _load_source
 from six import add_metaclass
 from test.util import _IntegrationTest
 import os
 import os.path as osp
 import pytest
 
-try:
-  # Python 3.12 and above
-  from importlib import load_source
-except ImportError:
-  # Below Python 3.12
-  from imp import load_source
-
 class _ExamplesType(type):
 
   """Metaclass generating a test for each example."""
@@ -31,7 +25,7 @@ def make_test(fname):
 
       def test(self):
         try:
-          load_source(module, fpath)
+          _load_source(module, fpath)
         except ImportError:
           # Unmet dependency.
           pytest.skip()