feat: methods without a return now return self

Author: ScottBoyce

ResultContainer/__init__.py

@@ -443,14 +443,15 @@ def unwrap(self) -> list[str]:
 
     def append(self, msg, add_traceback: bool = True, *, _levels=-2):
         """
-        Append an error message to the instance. If
+        Append an error message to the instance and return it.
 
         Args:
             msg  (Any, optional): Error message to append.
             add_traceback (bool): Optional, add traceback info.
         """
         if len(self.msg) < self.max_messages:
             self._process_error_messages(msg, add_traceback, _levels=_levels)
+        return self
 
     def set_max_messages(self, max_messages: int):
         """Set the maximum number of error messages that are kept."""
@@ -460,6 +461,7 @@ def set_max_messages(self, max_messages: int):
             self.max_messages = max_messages
 
         self._check_max_messages()
+        return self
 
     def copy(self):
         """Return a copy of the ResultErr instance."""
@@ -1247,6 +1249,7 @@ def add_Err_msg(self, error_msg, add_traceback: bool = True, *, _levels=-3):
             self._val = ResultErr()
         if error_msg != "":
             self._val.append(error_msg, add_traceback, _levels=_levels)
+        return self
 
     def update_result(self, value, create_new=False, deepcopy=False):
         if create_new: