Some small changes

Author: rocky

mathicsscript/format.py

@@ -27,7 +27,7 @@ def format_output(obj, expr, format=None):
         leaves = expr.get_leaves()
         if len(leaves) == 1:
             expr = leaves[0]
-    elif expr_type == "System`Graphics":
+    elif expr_type in ("System`Graphics", "System`Plot"):
         result = "-System Graphics-"
         # result = Expression("StandardForm", expr).format(obj, "System`MathMLForm")
         # ml_str = result.leaves[0].leaves[0]
@@ -41,7 +41,7 @@ def format_output(obj, expr, format=None):
     elif format == "tex":
         result = Expression("StandardForm", expr).format(obj, "System`TeXForm")
     elif format == "unformatted":
-        if str(expr) == "-Graph-":
+        if str(expr) == "-Graph-" and hasattr(expr, "G"):
             return format_graph(expr.G)
         else:
             result = expr.format(obj, "System`OutputForm")

mathicsscript/termshell.py

@@ -276,7 +276,7 @@ def complete_symbol_name(self, text, state):
                 )
             return self._complete_symbol_name(text, state)
 
-        except Exception as e:
+        except Exception:
             # any exception thrown inside the completer gets silently
             # thrown away otherwise
             print("Unhandled error in readline completion")
@@ -319,7 +319,7 @@ def get_completion_candidates(self, text):
             suffix = text
         try:
             matches = self.definitions.get_matching_names(suffix + "*")
-        except Exception as e:
+        except Exception:
             return []
         if "`" not in text:
             matches = [strip_context(m) for m in matches]