fix: migrated (PR 4146): Set _post as a property so it's initialized when needed

doc/changelog.d/4147.miscellaneous.md

@@ -0,0 +1 @@
+Fix: migrated (PR 4146): Set _post as a property so it's initialized when needed

src/ansys/mapdl/core/mapdl_core.py

@@ -375,7 +375,7 @@ def __init__(
         if log_apdl:
             self.open_apdl_log(log_apdl, mode="w")
 
-        self._post = PostProcessing(self)
+        self._post_object = None
 
         # Wrapping listing functions for "to_array" methods
         self._wrap_listing_functions()
@@ -392,6 +392,15 @@ def __init__(
     def _after_run(self, _command: str) -> None:
         pass
 
+    @property
+    def _post(self):
+        """
+        Initializes _post_object and allows _post to be None at __init__
+        """
+        if self._post_object is None:
+            self._post_object = PostProcessing(self)
+        return self._post_object
+
     @property
     def allow_ignore(self):
         """Invalid commands will be ignored rather than exceptions