Use posixpath.sep instead of os.sep to have consistent across OS rendering

Author: yarikoptic

tools/examplecode/example.py

@@ -7,7 +7,7 @@
 
 """
 
-import os
+import posixpath
 
 
 class DirectoryTree:
@@ -69,7 +69,9 @@ def _add_dictionary(
 
         # We are dealing with a directory
         else:
-            self._tree.append(f"{prefix}{connector} {entry.rstrip(os.sep)}{os.sep}")
+            self._tree.append(
+                f"{prefix}{connector} {entry.rstrip(posixpath.sep)}{posixpath.sep}"
+            )
             prefix += (
                 self.PIPE_PREFIX if index != entries_count - 1 else self.SPACE_PREFIX
             )