added pythonnet check with warning output

src/ansys/mechanical/core/embedding/app.py

@@ -2,6 +2,12 @@
 import atexit
 import os
 import typing
+import warnings
+
+try:
+    from pip._internal.operations import freeze
+except ImportError:  # pip < 10.0
+    from pip.operations import freeze
 
 from ansys.mechanical.core.embedding import initializer, runtime
 from ansys.mechanical.core.embedding.config import Configuration, configure
@@ -71,6 +77,20 @@ def __init__(self, db_file=None, **kwargs):
         if self._version == None:
             self._version = _get_default_version()
         initializer.initialize(self._version)
+
+        # Check if 'pythonnet' is installed... and if so, throw warning
+        pkgs = freeze.freeze()
+        for pkg in pkgs:
+            indx = pkg.index("=")
+            if pkg[:indx] == "pythonnet":
+                warnings.warn(
+                    "The pythonnet package was found in your environment "
+                    "which interferes with the ansys-pythonnet package. "
+                    "Some APIs may not work due to pythonnet being installed.",
+                    stacklevel=2,
+                )
+                break
+
         import clr
 
         clr.AddReference("Ansys.Mechanical.Embedding")