Correct issues highlighted by Flake8

Flake8 validates code style against PEP 8 in order to encourage the
writing of idiomatic Python. For reference, I am currently ignoring
errors about line length (E501) because I feel it makes code harder
to read.

This is the invocation I am using:

    $ flake8 --ignore E501 dspace_statistics_api

dspace_statistics_api/app.py

@@ -4,6 +4,7 @@ import falcon
 db = database_connection()
 db.set_session(readonly=True)
 
+
 class RootResource:
     def on_get(self, req, resp):
         resp.status = falcon.HTTP_200
@@ -11,6 +12,7 @@ class RootResource:
         with open('dspace_statistics_api/docs/index.html', 'r') as f:
             resp.body = f.read()
 
+
 class AllItemsResource:
     def on_get(self, req, resp):
         """Handles GET requests"""
@@ -33,19 +35,20 @@ class AllItemsResource:
 
         # iterate over results and build statistics object
         for item in cursor:
-            statistics.append({ 'id': item['id'], 'views': item['views'], 'downloads': item['downloads'] })
+            statistics.append({'id': item['id'], 'views': item['views'], 'downloads': item['downloads']})
 
         cursor.close()
 
         message = {
-                'currentPage': page,
-                'totalPages': pages,
-                'limit': limit,
-                'statistics': statistics
+            'currentPage': page,
+            'totalPages': pages,
+            'limit': limit,
+            'statistics': statistics
         }
 
         resp.media = message
 
+
 class ItemResource:
     def on_get(self, req, resp, item_id):
         """Handles GET requests"""
@@ -54,8 +57,8 @@ class ItemResource:
         cursor.execute('SELECT views, downloads FROM items WHERE id={}'.format(item_id))
         if cursor.rowcount == 0:
             raise falcon.HTTPNotFound(
-                    title='Item not found',
-                    description='The item with id "{}" was not found.'.format(item_id)
+                title='Item not found',
+                description='The item with id "{}" was not found.'.format(item_id)
             )
         else:
             results = cursor.fetchone()
@@ -70,6 +73,7 @@ class ItemResource:
 
         cursor.close()
 
+
 api = application = falcon.API()
 api.add_route('/', RootResource())
 api.add_route('/items', AllItemsResource())

dspace_statistics_api/database.py

@@ -3,7 +3,9 @@ from .config import DATABASE_USER
 from .config import DATABASE_PASS
 from .config import DATABASE_HOST
 from .config import DATABASE_PORT
-import psycopg2, psycopg2.extras
+import psycopg2
+import psycopg2.extras
+
 
 def database_connection():
     connection = psycopg2.connect("dbname={} user={} password={} host={} port={}".format(DATABASE_NAME, DATABASE_USER, DATABASE_PASS, DATABASE_HOST, DATABASE_PORT), cursor_factory=psycopg2.extras.DictCursor)

dspace_statistics_api/indexer.py

@@ -34,6 +34,7 @@ import json
 import psycopg2.extras
 from .solr import solr_connection
 
+
 def index_views():
     # get total number of distinct facets for items with a minimum of 1 view,
     # otherwise Solr returns all kinds of weird ids that are actually not in
@@ -42,16 +43,16 @@ def index_views():
     #
     # see: https://lucene.apache.org/solr/guide/6_6/the-stats-component.html
     res = solr.query('statistics', {
-        'q':'type:2',
-        'fq':'isBot:false AND statistics_type:view',
-        'facet':True,
-        'facet.field':'id',
-        'facet.mincount':1,
-        'facet.limit':1,
-        'facet.offset':0,
-        'stats':True,
-        'stats.field':'id',
-        'stats.calcdistinct':True
+        'q': 'type:2',
+        'fq': 'isBot:false AND statistics_type:view',
+        'facet': True,
+        'facet.field': 'id',
+        'facet.mincount': 1,
+        'facet.limit': 1,
+        'facet.offset': 0,
+        'stats': True,
+        'stats.field': 'id',
+        'stats.calcdistinct': True
     }, rows=0)
 
     # get total number of distinct facets (countDistinct)
@@ -71,13 +72,13 @@ def index_views():
         print('Indexing item views (page {} of {})'.format(results_current_page, results_num_pages))
 
         res = solr.query('statistics', {
-            'q':'type:2',
-            'fq':'isBot:false AND statistics_type:view',
-            'facet':True,
-            'facet.field':'id',
-            'facet.mincount':1,
-            'facet.limit':results_per_page,
-            'facet.offset':results_current_page * results_per_page
+            'q': 'type:2',
+            'fq': 'isBot:false AND statistics_type:view',
+            'facet': True,
+            'facet.field': 'id',
+            'facet.mincount': 1,
+            'facet.limit': results_per_page,
+            'facet.offset': results_current_page * results_per_page
         }, rows=0)
 
         # SolrClient's get_facets() returns a dict of dicts
@@ -98,19 +99,20 @@ def index_views():
 
     cursor.close()
 
+
 def index_downloads():
     # get the total number of distinct facets for items with at least 1 download
     res = solr.query('statistics', {
-        'q':'type:0',
-        'fq':'isBot:false AND statistics_type:view AND bundleName:ORIGINAL',
-        'facet':True,
-        'facet.field':'owningItem',
-        'facet.mincount':1,
-        'facet.limit':1,
-        'facet.offset':0,
-        'stats':True,
-        'stats.field':'owningItem',
-        'stats.calcdistinct':True
+        'q': 'type:0',
+        'fq': 'isBot:false AND statistics_type:view AND bundleName:ORIGINAL',
+        'facet': True,
+        'facet.field': 'owningItem',
+        'facet.mincount': 1,
+        'facet.limit': 1,
+        'facet.offset': 0,
+        'stats': True,
+        'stats.field': 'owningItem',
+        'stats.calcdistinct': True
     }, rows=0)
 
     # get total number of distinct facets (countDistinct)
@@ -130,13 +132,13 @@ def index_downloads():
         print('Indexing item downloads (page {} of {})'.format(results_current_page, results_num_pages))
 
         res = solr.query('statistics', {
-            'q':'type:0',
-            'fq':'isBot:false AND statistics_type:view AND bundleName:ORIGINAL',
-            'facet':True,
-            'facet.field':'owningItem',
-            'facet.mincount':1,
-            'facet.limit':results_per_page,
-            'facet.offset':results_current_page * results_per_page
+            'q': 'type:0',
+            'fq': 'isBot:false AND statistics_type:view AND bundleName:ORIGINAL',
+            'facet': True,
+            'facet.field': 'owningItem',
+            'facet.mincount': 1,
+            'facet.limit': results_per_page,
+            'facet.offset': results_current_page * results_per_page
         }, rows=0)
 
         # SolrClient's get_facets() returns a dict of dicts
@@ -157,6 +159,7 @@ def index_downloads():
 
     cursor.close()
 
+
 db = database_connection()
 solr = solr_connection()
 

dspace_statistics_api/solr.py

@@ -1,6 +1,7 @@
 from .config import SOLR_SERVER
 from SolrClient import SolrClient
 
+
 def solr_connection():
     connection = SolrClient(SOLR_SERVER)