Add support for Python 3.9 and fix deprecation warning

.travis.yml

@@ -7,6 +7,7 @@ python:
   - 3.6
   - 3.7
   - 3.8
+  - 3.9
 before_install: pip install --upgrade setuptools
 install: pip install tox tox-travis coveralls
 before_script: if [[ $TRAVIS_PYTHON_VERSION == '2.7' ]]; then tox -e flake8; fi

pyhocon/config_parser.py

@@ -1,7 +1,6 @@
 import codecs
 import contextlib
 import copy
-import imp
 import itertools
 import logging
 import os
@@ -63,6 +62,27 @@ def glob(pathname, recursive=False):
 else:
     from glob import glob
 
+
+# Fix deprecated warning with 'imp' library and Python 3.4+.
+# See: https://github.com/chimpler/pyhocon/issues/248
+if sys.version_info >= (3, 4):
+    import importlib.util
+
+    def find_package_dir(name):
+        spec = importlib.util.find_spec(name)
+        # When `imp.find_module()` cannot find a package it raises ImportError.
+        # Here we should simulate it to keep the compatibility with older
+        # versions.
+        if not spec:
+            raise ImportError('No module named {!r}'.format(name))
+        return os.path.dirname(spec.origin)
+else:
+    import imp
+
+    def find_package_dir(name):
+        return imp.find_module(name)[1]
+
+
 logger = logging.getLogger(__name__)
 
 #
@@ -727,7 +747,7 @@ def resolve_package_path(cls, package_path):
         if ':' not in package_path:
             raise ValueError("Expected format is 'PACKAGE:PATH'")
         package_name, path_relative = package_path.split(':', 1)
-        package_dir = imp.find_module(package_name)[1]
+        package_dir = find_package_dir(package_name)
         path_abs = os.path.join(package_dir, path_relative)
         return path_abs
 

setup.py

@@ -46,7 +46,8 @@ def run_tests(self):
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
-        'Programming Language :: Python :: 3.8'
+        'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
     ],
     packages=[
         'pyhocon',

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = flake8, py{27,34,35,36,37,38}
+envlist = flake8, py{27,34,35,36,37,38,39}
 
 [testenv]
 passenv = TRAVIS TRAVIS_JOB_ID TRAVIS_BRANCH