feat(numericalInput): fix typos and pylint error

Author: jesusbalderramawgu

cms/djangoapps/contentstore/api/views/utils.py

@@ -8,6 +8,7 @@
 from opaque_keys.edx.keys import CourseKey
 from rest_framework import status
 from rest_framework.generics import GenericAPIView
+
 from common.djangoapps.student.auth import has_course_author_access
 from openedx.core.djangoapps.util.forms import to_bool
 from openedx.core.lib.api.view_utils import DeveloperErrorViewMixin, view_auth_classes

xmodule/capa/inputtypes.py

@@ -1308,7 +1308,7 @@ def preview_formcalc(self, get):
         result["preview"] = numeric_result["preview"]
         if numeric_result["error"]:
             result["error"] = numeric_result["error"]
-        # if formula is invalid retrn formula
+        # if formula is invalid return formula
         if not numeric_result["is_valid"]:
             result["formula"] = formula
 

xmodule/capa_block.py

@@ -2407,7 +2407,7 @@ def preview_numeric_input(cls, formula):
             result["error"] = "Sorry, couldn't parse formula"
             result['is_valid'] = False
             return result
-        except Exception:
+        except (ValueError, TypeError):
             log.warning("Error while previewing formula", exc_info=True)
             result['error'] = "Error while rendering preview"
             result['is_valid'] = False