mdf: catch more pint parsing errors

psyneulink/core/globals/mdf.py

@@ -96,9 +96,11 @@
 import psyneulink
 import re
 import tempfile
+import tokenize
 import types
 import time
 import warnings
+from typing import Any, Union
 
 from psyneulink.core.globals.keywords import \
     MODEL_SPEC_ID_GENERIC, MODEL_SPEC_ID_PARAMETER_SOURCE, \
@@ -191,6 +193,29 @@ def default(self, o):
             return str(o)
 
 
+def _parse_pint_object(obj: Any) -> Union[pint.Unit, pint.Quantity, None]:
+    # varying and don't have a consistent way to identify otherwise
+    pint_errs = (
+        AssertionError,
+        AttributeError,
+        TypeError,
+        ValueError,
+        pint.errors.DefinitionSyntaxError,
+        tokenize.TokenError,
+    )
+    try:
+        return psyneulink._unit_registry.Unit(obj)
+    except pint_errs:
+        pass
+
+    try:
+        return psyneulink._unit_registry.Quantity(obj)
+    except pint_errs:
+        pass
+
+    return None
+
+
 def _get_variable_parameter_name(obj):
     try:
         if obj.parameters.variable.mdf_name is not None:
@@ -482,18 +507,7 @@ def _parse_parameter_value(value, component_identifiers=None, name=None, parent_
         if identifier in component_identifiers:
             value = identifier
 
-        try:
-            psyneulink._unit_registry.Unit(value)
-        except (AttributeError, TypeError, ValueError, pint.errors.DefinitionSyntaxError):
-            pass
-        else:
-            value = f"'{value}'"
-
-        try:
-            psyneulink._unit_registry.Quantity(value)
-        except (AttributeError, TypeError, ValueError, pint.errors.DefinitionSyntaxError):
-            pass
-        else:
+        if _parse_pint_object(value) is not None:
             value = f"'{value}'"
 
         evaluates = False