utils: remove deprecation warning

> pysipp/utils.py:2: DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses
>    import imp  # XXX py2.7

Author: linuxmaniac

pysipp/utils.py

@@ -1,8 +1,9 @@
-import imp  # XXX py2.7
+import importlib
 import inspect
 import logging
 import os
 import tempfile
+import types
 
 LOG_FORMAT = (
     "%(asctime)s %(threadName)s [%(levelname)s] %(name)s "
@@ -12,6 +13,19 @@
 DATE_FORMAT = "%b %d %H:%M:%S"
 
 
+def load_source(name: str, path: str) -> types.ModuleType:
+    """
+    Replacement for deprecated imp.load_source()
+    Thanks to:
+    https://github.com/epfl-scitas/spack for pointing out the
+    important missing "spec.loader.exec_module(module)" line.
+    """
+    spec = importlib.util.spec_from_file_location(name, path)
+    module = importlib.util.module_from_spec(spec)
+    spec.loader.exec_module(module)
+    return module
+
+
 def get_logger():
     """Get the project logger instance"""
     return logging.getLogger("pysipp")
@@ -32,7 +46,7 @@ def load_mod(path, name=None):
     """Load a source file as a module"""
     name = name or os.path.splitext(os.path.basename(path))[0]
     # load module sources
-    return imp.load_source(name, path)
+    return load_source(name, path)
 
 
 def iter_data_descrs(cls):

tests/test_utils.py

@@ -0,0 +1,15 @@
+import os.path
+
+import pytest
+
+from pysipp import utils
+
+
+def test_load_mod(scendir):
+    confpy = os.path.join(scendir, "default_with_confpy", "pysipp_conf.py")
+    assert utils.load_mod(confpy)
+
+
+def test_load_mod_ko():
+    with pytest.raises(FileNotFoundError):
+        utils.load_mod("not_here.py")