diff --git a/cps/db.py b/cps/db.py
index c6e069e5..831b597e 100755
--- a/cps/db.py
+++ b/cps/db.py
@@ -67,9 +67,9 @@ class Identifiers(Base):
     val = Column(String)
     book = Column(Integer, ForeignKey('books.id'))
 
-    def __init__(self, val, type, book):
+    def __init__(self, val, id_type, book):
         self.val = val
-        self.type = type
+        self.type = id_type
         self.book = book
 
     def formatType(self):
@@ -209,9 +209,9 @@ class Data(Base):
     uncompressed_size = Column(Integer)
     name = Column(String)
 
-    def __init__(self, book, format, uncompressed_size, name):
+    def __init__(self, book, book_format, uncompressed_size, name):
         self.book = book
-        self.format = format
+        self.format = book_format
         self.uncompressed_size = uncompressed_size
         self.name = name
 
@@ -274,7 +274,7 @@ class Custom_Columns(Base):
     display = Column(String)
     is_multiple = Column(Boolean)
     normalized = Column(Boolean)
-    
+
     def get_display_dict(self):
         display_dict = ast.literal_eval(self.display)
         return display_dict
@@ -333,15 +333,15 @@ def setup_db():
                               'value': Column(String)}
                 cc_classes[row.id] = type('Custom_Column_' + str(row.id), (Base,), ccdict)
 
-        for id in cc_ids:
-            if id[1] == 'bool':
-                setattr(Books, 'custom_column_' + str(id[0]), relationship(cc_classes[id[0]],
+        for cc_id in cc_ids:
+            if cc_id[1] == 'bool':
+                setattr(Books, 'custom_column_' + str(cc_id[0]), relationship(cc_classes[cc_id[0]],
                                                                            primaryjoin=(
-                                                                           Books.id == cc_classes[id[0]].book),
+                                                                           Books.id == cc_classes[cc_id[0]].book),
                                                                            backref='books'))
             else:
-                setattr(Books, 'custom_column_' + str(id[0]), relationship(cc_classes[id[0]],
-                                                                           secondary=books_custom_column_links[id[0]],
+                setattr(Books, 'custom_column_' + str(cc_id[0]), relationship(cc_classes[cc_id[0]],
+                                                                           secondary=books_custom_column_links[cc_id[0]],
                                                                            backref='books'))
 
     # Base.metadata.create_all(engine)
diff --git a/cps/helper.py b/cps/helper.py
index 71cacd74..36a25d0e 100755
--- a/cps/helper.py
+++ b/cps/helper.py
@@ -94,7 +94,7 @@ def make_mobi(book_id, calibrepath):
         if not check or check < 2:
             book.data.append(db.Data(
                     name=book.data[0].name,
-                    format="MOBI",
+                    book_format="MOBI",
                     book=book.id,
                     uncompressed_size=os.path.getsize(file_path + ".mobi")
                 ))
diff --git a/cps/ub.py b/cps/ub.py
index 05f0714e..448bb29e 100644
--- a/cps/ub.py
+++ b/cps/ub.py
@@ -293,10 +293,8 @@ class Config:
         else:
             self.config_google_drive_watch_changes_response=None
         self.config_columns_to_ignore = data.config_columns_to_ignore
-        if self.config_calibre_dir is not None and (not self.config_use_google_drive or os.path.exists(self.config_calibre_dir + '/metadata.db')):
-            self.db_configured = True
-        else:
-            self.db_configured = False
+        self.db_configured = bool(self.config_calibre_dir is not None and
+                (not self.config_use_google_drive or os.path.exists(self.config_calibre_dir + '/metadata.db')))
 
     @property
     def get_main_dir(self):