Made pass-through option to set encoding.

montepy/input_parser/input_file.py

@@ -57,16 +57,26 @@ def lineno(self):
         """
         pass
 
-    def open(self, mode):
+    def open(self, mode, encoding="ascii"):
         """
         Opens the underlying file, and returns self.
 
         This should only ever be completed from within a ``with`` statement.
         For this reason, a ``close`` functional is intentionally
         not provided.
 
+
+        .. Note::
+            For different encoding schemes see the available list
+            `here <https://docs.python.org/3.9/library/codecs.html#standard-encodings>`_.
+
+            CP1252 is commonly referred to as "extended-ASCII".
+            You may have success with this encoding for working with special characters.
+
         :param mode: the mode to open the file in
         :type mode: str
+        :param encoding: The encoding scheme to use.
+        :type encoding: str
         :returns: self
         """
         self._fh = open(self.path, mode, encoding="ascii")

montepy/input_parser/input_reader.py

@@ -3,17 +3,26 @@
 from montepy.constants import DEFAULT_VERSION
 
 
-def read_input(input_file, mcnp_version=DEFAULT_VERSION):
+def read_input(input_file, mcnp_version=DEFAULT_VERSION, encoding="ascii"):
     """
     Reads the specified MCNP Input file.
 
     The MCNP version must be a three component tuple e.g., (6, 2, 0) and (5, 1, 60).
 
+    .. Note::
+        For different encoding schemes see the available list
+        `here <https://docs.python.org/3.9/library/codecs.html#standard-encodings>`_.
+
+        CP1252 is commonly referred to as "extended-ASCII".
+        You may have success with this encoding for working with special characters.
+
     :param input_file: the path to the input file to read.
     :type input_file: str
     :param mcnp_version: The version of MCNP that the input is intended for.
     :type mcnp_version: tuple
     :returns: The MCNP_Problem instance representing this file.
+    :param encoding: The encoding scheme to use.
+    :type encoding: str
     :rtype: MCNP_Problem
     :raises UnsupportedFeature: If an input format is used that MontePy does not support.
     :raises MalformedInputError: If an input has a broken syntax.