Handle ValueError in PythonValidator. Python2 raises ValueError if the input contains an invalid escape sequence.

Author: jonathanslenders

ptpython/validator.py

@@ -42,3 +42,7 @@ def validate(self, document):
         except TypeError as e:
             # e.g. "compile() expected string without null bytes"
             raise ValidationError(0, str(e))
+        except ValueError as e:
+            # In Python 2, compiling "\x9" (an invalid escape sequence) raises
+            # ValueError instead of SyntaxError.
+            raise ValidationError(0, 'Syntax Error: %s' % e)