Used pycodestyle instead of custom pylint check (oppia#10292)

* Used pycodestyle instead of custom pylint check

* Fixed lint checks

Author: Hudda

core/controllers/base.py

@@ -108,31 +108,26 @@ class NotLoggedInException(Exception):
 
         pass
 
-
     class InvalidInputException(Exception):
         """Error class for invalid input on the user side (error code 400)."""
 
         pass
 
-
     class UnauthorizedUserException(Exception):
         """Error class for unauthorized access."""
 
         pass
 
-
     class PageNotFoundException(Exception):
         """Error class for a page not found error (error code 404)."""
 
         pass
 
-
     class InternalErrorException(Exception):
         """Error class for an internal server side error (error code 500)."""
 
         pass
 
-
     class TemporaryMaintenanceException(Exception):
         """Error class for when the server is currently down for temporary
         maintenance (error code 503).

core/controllers/editor_test.py

@@ -144,7 +144,6 @@ def test_new_state_template(self):
         # by validating it.
         exploration.states[feconf.DEFAULT_INIT_STATE_NAME].validate(None, True)
 
-
     def test_that_default_exploration_cannot_be_published(self):
         """Test that publishing a default exploration raises an error
         due to failing strict validation.
@@ -2242,7 +2241,6 @@ def setUp(self):
             'is_valid': True
         }
 
-
     def test_resolve_issue_handler(self):
         """Test that resolving an issue deletes associated playthroughs."""
         with self.login_context(self.MODERATOR_EMAIL):

core/controllers/learner_playlist_test.py

@@ -157,7 +157,6 @@ def test_add_exploration_to_learner_playlist(self):
                     'exp_id_%s' % exp_id), {},
                 csrf_token=csrf_token)
 
-
         # Now if we try and add an activity we should get a message saying we
         # are exceeding the limit.
         response = self.post_json(

core/controllers/practice_sessions_test.py

@@ -81,15 +81,13 @@ def test_any_user_can_access_practice_sessions_page(self):
                 '/learn/staging/public-topic-name/practice/session?'
                 'selected_subtopic_ids=1,2')
 
-
     def test_no_user_can_access_unpublished_topic_practice_session_page(self):
         with self.swap(constants, 'ENABLE_NEW_STRUCTURE_PLAYERS', True):
             self.get_html_response(
                 '/learn/staging/private-topic-name/practice/session?'
                 'selected_subtopic_ids=1,2',
                 expected_status_int=404)
 
-
     def test_get_fails_when_new_structures_not_enabled(self):
         with self.swap(constants, 'ENABLE_NEW_STRUCTURE_PLAYERS', False):
             self.get_html_response(

core/controllers/review_tests.py

@@ -71,7 +71,6 @@ def get(self, story_id):
         for skill in skills:
             skill_descriptions[skill.id] = skill.description
 
-
         self.values.update({
             'skill_descriptions': skill_descriptions,
             'story_name': story.title

core/controllers/skill_mastery.py

@@ -64,7 +64,6 @@ def get(self):
         })
         self.render_json(self.values)
 
-
     @acl_decorators.can_access_learner_dashboard
     def put(self):
         """Handles PUT requests."""

core/controllers/story_viewer_test.py

@@ -298,7 +298,6 @@ def test_post_fails_when_node_does_not_exist(self):
                 ), {}, csrf_token=csrf_token, expected_status_int=404
             )
 
-
     def test_post_fails_when_story_is_not_published_in_story_mode(self):
         topic_services.unpublish_story(
             self.TOPIC_ID, self.STORY_ID, self.admin_id)

core/controllers/subtopic_viewer_test.py

@@ -157,7 +157,6 @@ def test_any_user_can_access_subtopic_viewer_page(self):
             self.get_html_response(
                 '/learn/staging/%s/revision/%s' % ('name', 'sub-url-frag-one'))
 
-
     def test_accessibility_of_subtopic_viewer_page_of_unpublished_topic(
             self):
         with self.swap(constants, 'ENABLE_NEW_STRUCTURE_PLAYERS', True):
@@ -171,7 +170,6 @@ def test_accessibility_of_subtopic_viewer_page_of_unpublished_topic(
                 % ('pvttopic', 'sub-url-frag-one'))
             self.logout()
 
-
     def test_get_fails_when_new_structures_not_enabled(self):
         with self.swap(constants, 'ENABLE_NEW_STRUCTURE_PLAYERS', False):
             self.get_html_response(

core/controllers/suggestion_test.py

@@ -1267,7 +1267,6 @@ def setUp(self):
         self.signup(self.AUTHOR_EMAIL, 'author')
         self.signup(self.REVIEWER_EMAIL, 'reviewer')
 
-
         self.owner_id = self.get_user_id_from_email(self.OWNER_EMAIL)
         self.TOPIC_ID = 'topic'
         self.STORY_ID = 'story'

core/controllers/topic_viewer_test.py

@@ -115,7 +115,6 @@ def test_any_user_can_access_topic_viewer_page(self):
         with self.swap(constants, 'ENABLE_NEW_STRUCTURE_PLAYERS', True):
             self.get_html_response('/learn/staging/%s' % 'public')
 
-
     def test_accessibility_of_unpublished_topic_viewer_page(self):
         with self.swap(constants, 'ENABLE_NEW_STRUCTURE_PLAYERS', True):
             self.get_html_response(
@@ -125,7 +124,6 @@ def test_accessibility_of_unpublished_topic_viewer_page(self):
             self.get_html_response('/learn/staging/%s' % 'private')
             self.logout()
 
-
     def test_get_fails_when_new_structures_not_enabled(self):
         with self.swap(constants, 'ENABLE_NEW_STRUCTURE_PLAYERS', False):
             self.get_html_response(

core/domain/activity_jobs_one_off.py

@@ -238,7 +238,6 @@ def map(commit_model):
         else:
             yield ('FAILURE_INCORRECT - %s' % class_name, commit_model.id)
 
-
     @staticmethod
     def reduce(key, values):
         """Implements the reduce function for this job."""

core/domain/collection_domain_test.py

@@ -558,7 +558,6 @@ def test_next_explorations_in_sequence(self):
             collection.get_next_exploration_id_in_sequence(exploration_id),
             None)
 
-
         collection.add_node('exp_id_1')
         collection.add_node('exp_id_2')
         self.assertEqual(
@@ -667,7 +666,6 @@ def test_from_yaml_with_invalid_schema_version_raises_error(self):
                 self.COLLECTION_ID, yaml_content)
 
 
-
 class SchemaMigrationMethodsUnitTests(test_utils.GenericTestBase):
     """Tests the presence of appropriate schema migration methods in the
     Collection domain object class.

core/domain/email_manager_test.py

@@ -2975,7 +2975,6 @@ def test_send_removed_translation_reviewer_email(self):
             'Best wishes,<br>'
             'The Oppia Community')
 
-
         with self.can_send_emails_ctx:
             email_manager.send_email_to_removed_contribution_reviewer(
                 self.translation_reviewer_id,
@@ -3021,7 +3020,6 @@ def test_send_removed_voiceover_reviewer_email(self):
             'Best wishes,<br>'
             'The Oppia Community')
 
-
         with self.can_send_emails_ctx:
             email_manager.send_email_to_removed_contribution_reviewer(
                 self.voiceover_reviewer_id,
@@ -3065,7 +3063,6 @@ def test_send_removed_question_reviewer_email(self):
             'Best wishes,<br>'
             'The Oppia Community')
 
-
         with self.can_send_emails_ctx:
             email_manager.send_email_to_removed_contribution_reviewer(
                 self.question_reviewer_id, constants.REVIEW_CATEGORY_QUESTION,

core/domain/exp_domain_test.py

@@ -8358,7 +8358,6 @@ def test_load_from_v41_with_text_inputs_case_sensitive_equals_rule(self):
             'eid', sample_yaml_content)
         self.assertEqual(exploration.to_yaml(), latest_sample_yaml_content)
 
-
     def test_cannot_load_from_yaml_with_no_schema_version(self):
         sample_yaml_content = (
             """author_notes: ''
@@ -9052,7 +9051,6 @@ class HTMLMigrationUnitTests(test_utils.GenericTestBase):
 title: title
 """)
 
-
     YAML_CONTENT_V27_WITHOUT_IMAGE_CAPTION = (
         """author_notes: ''
 auto_tts_enabled: true
@@ -9440,7 +9438,6 @@ class HTMLMigrationUnitTests(test_utils.GenericTestBase):
 """)
 # pylint: enable=line-too-long, single-line-pragma
 
-
     def test_load_from_v26_textangular(self):
         """Test direct loading from a v26 yaml file."""
         mock_get_filename_with_dimensions_context = self.swap(
@@ -9453,7 +9450,6 @@ def test_load_from_v26_textangular(self):
         self.assertEqual(
             exploration.to_yaml(), self.YAML_CONTENT_V44_IMAGE_DIMENSIONS)
 
-
     def test_load_from_v27_without_image_caption(self):
         """Test direct loading from a v27 yaml file."""
         mock_get_filename_with_dimensions_context = self.swap(

core/domain/exp_fetchers_test.py

@@ -658,7 +658,6 @@ def test_exploration_upgrade_v34_to_latest(self):
                 'MatchesExactlyWith': [{'x': 'x=y', 'y': 'both'}]
             })
 
-
         answer_groups_2 = [{
             'outcome': {
                 'dest': 'Introduction',
@@ -771,7 +770,6 @@ def test_exploration_upgrade_v34_to_latest(self):
                 'MatchesExactlyWith': [{'x': 'x+y'}]
             })
 
-
         answer_groups_3 = [{
             'outcome': {
                 'dest': 'Introduction',
@@ -962,7 +960,6 @@ def test_exploration_upgrade_v34_to_latest(self):
         self.save_new_exp_with_states_schema_v34(
             'exp_id_4', 'owner_id', states_dict)
 
-
         # Ensure the exploration was converted.
         exploration = exp_fetchers.get_exploration_by_id('exp_id_4')
         self.assertEqual(

core/domain/exp_jobs_one_off_test.py

@@ -957,7 +957,6 @@ def _mock_logging_function(msg, *args):
             """Mocks logging.error()."""
             observed_log_messages.append(msg % args)
 
-
         exploration = exp_domain.Exploration.create_default_exploration(
             self.VALID_EXP_ID, title='title', category='category')
         exp_services.save_new_exploration(self.albert_id, exploration)
@@ -2403,7 +2402,6 @@ def test_one_off_job_handles_unicode_in_latex_strings_correctly(self):
         self.assertEqual(
             exp_models.ExplorationMathRichTextInfoModel.get_all().count(), 1)
 
-
     def test_one_off_job_fails_with_invalid_exploration(self):
         """Test the audit job fails when there is an invalid exploration."""
         exploration = exp_domain.Exploration.create_default_exploration(

core/domain/exp_services_test.py

@@ -1050,7 +1050,6 @@ def test_cannot_get_multiple_explorations_by_version_with_invalid_handler(
                 'latest schema version.')):
             exp_fetchers.get_multiple_explorations_by_version('exp_id_1', [1])
 
-
     def test_save_multi_exploration_math_rich_text_info_model(self):
         multiple_explorations_math_rich_text_info = []
 
@@ -3668,7 +3667,6 @@ def mock_add_documents_to_index(docs, index):
             self.assertEqual(actual_docs, [updated_exp_doc])
             self.assertEqual(add_docs_counter.times_called, 3)
 
-
     def test_get_number_of_ratings(self):
         self.save_new_valid_exploration(self.EXP_0_ID, self.owner_id)
         exp = exp_fetchers.get_exploration_summary_by_id(self.EXP_0_ID)

core/domain/expression_parser_test.py

@@ -546,8 +546,6 @@ def test_validates_math_expression(self):
         self.assertTrue(expression_parser.is_valid_expression('sqrt(-1)'))
         self.assertTrue(expression_parser.is_valid_expression(
             'sqrt(-abs(-1))^2/abs(5)'))
-
-
         self.assertFalse(expression_parser.is_valid_expression('a+b/'))
         self.assertFalse(expression_parser.is_valid_expression('|x|'))
         self.assertFalse(expression_parser.is_valid_expression('||'))

core/domain/feedback_services_test.py

@@ -340,7 +340,6 @@ def test_get_thread_summaries(self):
             'exploration.' + self.EXP_ID_3 + '.' + self.THREAD_ID,
             self.user_id, None, None, 'not used here')
 
-
         thread_ids = subscription_services.get_all_threads_subscribed_to(
             self.user_id)
         thread_ids.append('exploration.' + self.EXP_ID_3 + '.' + self.THREAD_ID)
@@ -494,7 +493,6 @@ def test_only_exploration_threads_trigger_events(self):
             self.assertEqual(
                 event_handler_call_counter_exploration.times_called, 1)
 
-
         event_handler_call_counter_non_exploration = (
             test_utils.CallCounter(
                 event_services.FeedbackThreadCreatedEventHandler.record))

core/domain/fs_domain.py

@@ -199,7 +199,6 @@ def delete(self, filepath):
         except cloudstorage.NotFoundError:
             raise IOError('Image does not exist: %s' % filepath)
 
-
     def listdir(self, dir_name):
         """Lists all files in a directory.
 

core/domain/html_domain_test.py

@@ -63,7 +63,6 @@ def test_validate_when_encoded_vertical_padding_string_not_string(self):
                 '1d245', '4d345', 0)
 
 
-
 class LatexStringSvgImageDataTests(test_utils.GenericTestBase):
 
     def test_create_latex_string_svg_image_dimensions(self):

core/domain/html_validation_service_test.py

@@ -1863,7 +1863,6 @@ def test_validate_svg_filenames_when_all_filenames_are_valid(self):
                 feconf.ENTITY_TYPE_EXPLORATION, 'exp_id1',
                 html_string_with_filename_having_filename), [])
 
-
     def test_validate_svg_filenames_when_filenames_are_invalid(self):
         """Test the validate_svg_filenames_in_math_rich_text when
         filenames are present but invalid.
@@ -1896,7 +1895,6 @@ def test_validate_svg_filenames_when_filenames_are_invalid(self):
                 'ot;, "svg_filename": "img2.'
                 'svg&amp;quot;}"></oppia-noninteractive-math>')])
 
-
     def test_validate_svg_filenames_when_filenames_are_not_present(self):
         """Test the validate_svg_filenames_in_math_rich_text when
         filenames are not present.

core/domain/interaction_jobs_one_off_test.py

@@ -110,7 +110,6 @@ def test_exp_state_pairs_are_produced_only_for_desired_interactions(self):
         state1 = exploration.states['State1']
         state2 = exploration.states['State2']
 
-
         customization_args_dict1 = {
             'choices': {'value': [{
                 'html': '<p>This is value1 for DragAndDropSortInput</p>',

core/domain/param_domain.py

@@ -44,7 +44,6 @@ def __init__(self, obj_type):
         """
         self.obj_type = obj_type
 
-
     def to_dict(self):
         """Returns a dict representation of this ParamSpec.
 
@@ -56,7 +55,6 @@ def to_dict(self):
             'obj_type': self.obj_type,
         }
 
-
     @classmethod
     def from_dict(cls, param_spec_dict):
         """Creates a ParamSpec object from its dict representation.
@@ -72,7 +70,6 @@ def from_dict(cls, param_spec_dict):
         """
         return cls(param_spec_dict['obj_type'])
 
-
     def validate(self):
         """Validate the existence of the object class."""
 

core/domain/platform_parameter_domain_test.py

@@ -265,7 +265,6 @@ def _test_flavor_relation_does_not_hold(self, version, op, flavor_b):
             self._create_example_context(
                 app_version=version)))
 
-
     def test_create_from_dict_returns_correct_instance(self):
         filter_dict = {'type': 'app_version', 'conditions': [('=', '1.2.3')]}
         filter_domain = (

core/domain/prod_validation_jobs_one_off.py

@@ -2891,7 +2891,6 @@ def _validate_error(cls, item):
                 'Entity id %s: error for job is empty but '
                 'job status is %s' % (item.id, item.status_code))
 
-
     @classmethod
     def _validate_output(cls, item):
         """Validate output for entity is present only if status is

core/domain/prod_validation_jobs_one_off_test.py

@@ -8279,7 +8279,6 @@ def setUp(self):
                     'new_value': explorations[index * 2 + 1].id
                 })], 'Changes.')
 
-
         self.model_instance_0 = story_models.StoryModel.get_by_id('0')
         self.model_instance_1 = story_models.StoryModel.get_by_id('1')
         self.model_instance_2 = story_models.StoryModel.get_by_id('2')
@@ -11844,7 +11843,6 @@ def setUp(self):
                     'skill_id': '%s' % (index * 3 + 1)
                 })], 'Changes.')
 
-
         self.model_instance_0 = (
             topic_models.SubtopicPageCommitLogEntryModel.get_by_id(
                 'subtopicpage-0-1-1'))