diff --git a/openlp/core/common/__init__.py b/openlp/core/common/__init__.py
index bcdb99109..d9b401368 100644
--- a/openlp/core/common/__init__.py
+++ b/openlp/core/common/__init__.py
@@ -45,7 +45,7 @@ log = logging.getLogger(__name__ + '.__init__')
 FIRST_CAMEL_REGEX = re.compile('(.)([A-Z][a-z]+)')
 SECOND_CAMEL_REGEX = re.compile('([a-z0-9])([A-Z])')
 CONTROL_CHARS = re.compile(r'[\x00-\x08\x0B\x0C\x0E-\x1F\x7F-\x9F]')
-INVALID_FILE_CHARS = re.compile(r'[\\/:\*\?"<>\|\+\[\]%]')
+INVALID_FILE_CHARS = re.compile(r'[\\/:*?"<>|+\[\]%]')
 IMAGES_FILTER = None
 REPLACMENT_CHARS_MAP = str.maketrans({'\u2018': '\'', '\u2019': '\'', '\u201c': '"', '\u201d': '"', '\u2026': '...',
                                       '\u2013': '-', '\u2014': '-', '\v': '\n\n', '\f': '\n\n'})
@@ -112,21 +112,21 @@ def trace_error_handler(logger):
     logger.error(log_string)
 
 
-def extension_loader(glob_pattern, excluded_files=[]):
+def extension_loader(glob_pattern, excluded_files=None):
     """
     A utility function to find and load OpenLP extensions, such as plugins, presentation and media controllers and
     importers.
 
     :param str glob_pattern: A glob pattern used to find the extension(s) to be imported. Should be relative to the
         application directory. i.e. plugins/*/*plugin.py
-    :param list[str] excluded_files: A list of file names to exclude that the glob pattern may find.
+    :param list[str] | None excluded_files: A list of file names to exclude that the glob pattern may find.
     :rtype: None
     """
     from openlp.core.common.applocation import AppLocation
     app_dir = AppLocation.get_directory(AppLocation.AppDir)
     for extension_path in app_dir.glob(glob_pattern):
         extension_path = extension_path.relative_to(app_dir)
-        if extension_path.name in excluded_files:
+        if extension_path.name in (excluded_files or []):
             continue
         log.debug('Attempting to import %s', extension_path)
         module_name = path_to_module(extension_path)
diff --git a/openlp/core/common/i18n.py b/openlp/core/common/i18n.py
index 85fe35e2f..5b2aabf20 100644
--- a/openlp/core/common/i18n.py
+++ b/openlp/core/common/i18n.py
@@ -338,8 +338,8 @@ class UiStrings(object):
         Override the default object creation method to return a single instance.
         """
         if not cls.__instance__:
-            cls.__instance__ = object.__new__(cls)
-            cls.load(cls)
+            cls.__instance__ = super().__new__(cls)
+            cls.__instance__.load()
         return cls.__instance__
 
     def load(self):
@@ -503,7 +503,7 @@ def format_time(text, local_time):
         """
         return local_time.strftime(match.group())
 
-    return re.sub(r'\%[a-zA-Z]', match_formatting, text)
+    return re.sub(r'%[a-zA-Z]', match_formatting, text)
 
 
 def get_locale_key(string, numeric=False):
diff --git a/openlp/core/lib/db.py b/openlp/core/lib/db.py
index a0445730f..e2ef2e33e 100644
--- a/openlp/core/lib/db.py
+++ b/openlp/core/lib/db.py
@@ -265,7 +265,7 @@ def upgrade_db(url, upgrade):
     """
     if not database_exists(url):
         log.warning("Database {db} doesn't exist - skipping upgrade checks".format(db=url))
-        return (0, 0)
+        return 0, 0
 
     log.debug('Checking upgrades for DB {db}'.format(db=url))
 
diff --git a/openlp/core/lib/formattingtags.py b/openlp/core/lib/formattingtags.py
index 560cbb5f2..dc58cafd0 100644
--- a/openlp/core/lib/formattingtags.py
+++ b/openlp/core/lib/formattingtags.py
@@ -59,97 +59,98 @@ class FormattingTags(object):
         """
         temporary_tags = [tag for tag in FormattingTags.html_expands if tag.get('temporary')]
         FormattingTags.html_expands = []
-        base_tags = []
+        base_tags = [
+            {
+                'desc': translate('OpenLP.FormattingTags', 'Red'),
+                'start tag': '{r}',
+                'start html': '<span style="-webkit-text-fill-color:red">',
+                'end tag': '{/r}', 'end html': '</span>', 'protected': True,
+                'temporary': False
+            }, {
+                'desc': translate('OpenLP.FormattingTags', 'Black'),
+                'start tag': '{b}',
+                'start html': '<span style="-webkit-text-fill-color:black">',
+                'end tag': '{/b}', 'end html': '</span>', 'protected': True,
+                'temporary': False
+            }, {
+                'desc': translate('OpenLP.FormattingTags', 'Blue'),
+                'start tag': '{bl}',
+                'start html': '<span style="-webkit-text-fill-color:blue">',
+                'end tag': '{/bl}', 'end html': '</span>', 'protected': True,
+                'temporary': False
+            }, {
+                'desc': translate('OpenLP.FormattingTags', 'Yellow'),
+                'start tag': '{y}',
+                'start html': '<span style="-webkit-text-fill-color:yellow">',
+                'end tag': '{/y}', 'end html': '</span>', 'protected': True,
+                'temporary': False
+            }, {
+                'desc': translate('OpenLP.FormattingTags', 'Green'),
+                'start tag': '{g}',
+                'start html': '<span style="-webkit-text-fill-color:green">',
+                'end tag': '{/g}', 'end html': '</span>', 'protected': True,
+                'temporary': False
+            }, {
+                'desc': translate('OpenLP.FormattingTags', 'Pink'),
+                'start tag': '{pk}',
+                'start html': '<span style="-webkit-text-fill-color:#FFC0CB">',
+                'end tag': '{/pk}', 'end html': '</span>', 'protected': True,
+                'temporary': False
+            }, {
+                'desc': translate('OpenLP.FormattingTags', 'Orange'),
+                'start tag': '{o}',
+                'start html': '<span style="-webkit-text-fill-color:#FFA500">',
+                'end tag': '{/o}', 'end html': '</span>', 'protected': True,
+                'temporary': False
+            }, {
+                'desc': translate('OpenLP.FormattingTags', 'Purple'),
+                'start tag': '{pp}',
+                'start html': '<span style="-webkit-text-fill-color:#800080">',
+                'end tag': '{/pp}', 'end html': '</span>', 'protected': True,
+                'temporary': False
+            }, {
+                'desc': translate('OpenLP.FormattingTags', 'White'),
+                'start tag': '{w}',
+                'start html': '<span style="-webkit-text-fill-color:white">',
+                'end tag': '{/w}', 'end html': '</span>', 'protected': True,
+                'temporary': False
+            }, {
+                'desc': translate('OpenLP.FormattingTags', 'Superscript'),
+                'start tag': '{su}', 'start html': '<sup>',
+                'end tag': '{/su}', 'end html': '</sup>', 'protected': True,
+                'temporary': False
+            }, {
+                'desc': translate('OpenLP.FormattingTags', 'Subscript'),
+                'start tag': '{sb}', 'start html': '<sub>',
+                'end tag': '{/sb}', 'end html': '</sub>', 'protected': True,
+                'temporary': False
+            }, {
+                'desc': translate('OpenLP.FormattingTags', 'Paragraph'),
+                'start tag': '{p}', 'start html': '<p>', 'end tag': '{/p}',
+                'end html': '</p>', 'protected': True,
+                'temporary': False
+            }, {
+                'desc': translate('OpenLP.FormattingTags', 'Bold'),
+                'start tag': '{st}', 'start html': '<strong>',
+                'end tag': '{/st}', 'end html': '</strong>',
+                'protected': True, 'temporary': False
+            }, {
+                'desc': translate('OpenLP.FormattingTags', 'Italics'),
+                'start tag': '{it}', 'start html': '<em>', 'end tag': '{/it}',
+                'end html': '</em>', 'protected': True, 'temporary': False
+            }, {
+                'desc': translate('OpenLP.FormattingTags', 'Underline'),
+                'start tag': '{u}',
+                'start html': '<span style="text-decoration: underline;">',
+                'end tag': '{/u}', 'end html': '</span>', 'protected': True,
+                'temporary': False
+            }, {
+                'desc': translate('OpenLP.FormattingTags', 'Break'),
+                'start tag': '{br}', 'start html': '<br>', 'end tag': '',
+                'end html': '', 'protected': True,
+                'temporary': False
+            }]
         # Append the base tags.
-        base_tags.append({
-            'desc': translate('OpenLP.FormattingTags', 'Red'),
-            'start tag': '{r}',
-            'start html': '<span style="-webkit-text-fill-color:red">',
-            'end tag': '{/r}', 'end html': '</span>', 'protected': True,
-            'temporary': False})
-        base_tags.append({
-            'desc': translate('OpenLP.FormattingTags', 'Black'),
-            'start tag': '{b}',
-            'start html': '<span style="-webkit-text-fill-color:black">',
-            'end tag': '{/b}', 'end html': '</span>', 'protected': True,
-            'temporary': False})
-        base_tags.append({
-            'desc': translate('OpenLP.FormattingTags', 'Blue'),
-            'start tag': '{bl}',
-            'start html': '<span style="-webkit-text-fill-color:blue">',
-            'end tag': '{/bl}', 'end html': '</span>', 'protected': True,
-            'temporary': False})
-        base_tags.append({
-            'desc': translate('OpenLP.FormattingTags', 'Yellow'),
-            'start tag': '{y}',
-            'start html': '<span style="-webkit-text-fill-color:yellow">',
-            'end tag': '{/y}', 'end html': '</span>', 'protected': True,
-            'temporary': False})
-        base_tags.append({
-            'desc': translate('OpenLP.FormattingTags', 'Green'),
-            'start tag': '{g}',
-            'start html': '<span style="-webkit-text-fill-color:green">',
-            'end tag': '{/g}', 'end html': '</span>', 'protected': True,
-            'temporary': False})
-        base_tags.append({
-            'desc': translate('OpenLP.FormattingTags', 'Pink'),
-            'start tag': '{pk}',
-            'start html': '<span style="-webkit-text-fill-color:#FFC0CB">',
-            'end tag': '{/pk}', 'end html': '</span>', 'protected': True,
-            'temporary': False})
-        base_tags.append({
-            'desc': translate('OpenLP.FormattingTags', 'Orange'),
-            'start tag': '{o}',
-            'start html': '<span style="-webkit-text-fill-color:#FFA500">',
-            'end tag': '{/o}', 'end html': '</span>', 'protected': True,
-            'temporary': False})
-        base_tags.append({
-            'desc': translate('OpenLP.FormattingTags', 'Purple'),
-            'start tag': '{pp}',
-            'start html': '<span style="-webkit-text-fill-color:#800080">',
-            'end tag': '{/pp}', 'end html': '</span>', 'protected': True,
-            'temporary': False})
-        base_tags.append({
-            'desc': translate('OpenLP.FormattingTags', 'White'),
-            'start tag': '{w}',
-            'start html': '<span style="-webkit-text-fill-color:white">',
-            'end tag': '{/w}', 'end html': '</span>', 'protected': True,
-            'temporary': False})
-        base_tags.append({
-            'desc': translate('OpenLP.FormattingTags', 'Superscript'),
-            'start tag': '{su}', 'start html': '<sup>',
-            'end tag': '{/su}', 'end html': '</sup>', 'protected': True,
-            'temporary': False})
-        base_tags.append({
-            'desc': translate('OpenLP.FormattingTags', 'Subscript'),
-            'start tag': '{sb}', 'start html': '<sub>',
-            'end tag': '{/sb}', 'end html': '</sub>', 'protected': True,
-            'temporary': False})
-        base_tags.append({
-            'desc': translate('OpenLP.FormattingTags', 'Paragraph'),
-            'start tag': '{p}', 'start html': '<p>', 'end tag': '{/p}',
-            'end html': '</p>', 'protected': True,
-            'temporary': False})
-        base_tags.append({
-            'desc': translate('OpenLP.FormattingTags', 'Bold'),
-            'start tag': '{st}', 'start html': '<strong>',
-            'end tag': '{/st}', 'end html': '</strong>',
-            'protected': True, 'temporary': False})
-        base_tags.append({
-            'desc': translate('OpenLP.FormattingTags', 'Italics'),
-            'start tag': '{it}', 'start html': '<em>', 'end tag': '{/it}',
-            'end html': '</em>', 'protected': True, 'temporary': False})
-        base_tags.append({
-            'desc': translate('OpenLP.FormattingTags', 'Underline'),
-            'start tag': '{u}',
-            'start html': '<span style="text-decoration: underline;">',
-            'end tag': '{/u}', 'end html': '</span>', 'protected': True,
-            'temporary': False})
-        base_tags.append({
-            'desc': translate('OpenLP.FormattingTags', 'Break'),
-            'start tag': '{br}', 'start html': '<br>', 'end tag': '',
-            'end html': '', 'protected': True,
-            'temporary': False})
         FormattingTags.add_html_tags(base_tags)
         FormattingTags.add_html_tags(temporary_tags)
         user_expands_string = str(Settings().value('formattingTags/html_tags'))
diff --git a/openlp/core/projectors/manager.py b/openlp/core/projectors/manager.py
index 02b1c71f2..91b604b14 100644
--- a/openlp/core/projectors/manager.py
+++ b/openlp/core/projectors/manager.py
@@ -344,14 +344,14 @@ class ProjectorManager(QtWidgets.QWidget, RegistryBase, UiProjectorManager, LogM
         """
         log.debug('Checking for UDP port {port} listener deletion'.format(port=port))
         if port not in self.pjlink_udp:
-            log.warn('UDP listener for port {port} not there - skipping delete'.format(port=port))
+            log.warning('UDP listener for port {port} not there - skipping delete'.format(port=port))
             return
         keep_port = False
         for item in self.projector_list:
             if port == item.link.port:
                 keep_port = True
         if keep_port:
-            log.warn('UDP listener for port {port} needed for other projectors - skipping delete'.format(port=port))
+            log.warning('UDP listener for port {port} needed for other projectors - skipping delete'.format(port=port))
             return
         Registry().execute('udp_broadcast_remove', port=port)
         del self.pjlink_udp[port]
diff --git a/openlp/core/projectors/pjlink.py b/openlp/core/projectors/pjlink.py
index 5ca3d9ba3..403b96b7c 100644
--- a/openlp/core/projectors/pjlink.py
+++ b/openlp/core/projectors/pjlink.py
@@ -552,7 +552,7 @@ class PJLink(QtNetwork.QTcpSocket):
         data = data_in.strip()
         self.receive_data_signal()
         # Initial packet checks
-        if (len(data) < 7):
+        if len(data) < 7:
             self._trash_buffer(msg='get_data(): Invalid packet - length')
             return
         elif len(data) > self.max_size:
diff --git a/openlp/core/projectors/sourceselectform.py b/openlp/core/projectors/sourceselectform.py
index 1d40436a2..f34439d33 100644
--- a/openlp/core/projectors/sourceselectform.py
+++ b/openlp/core/projectors/sourceselectform.py
@@ -177,7 +177,7 @@ class FingerTabBarWidget(QtWidgets.QTabBar):
         :param height: Remove default height parameter in kwargs
         """
         self.tabSize = QtCore.QSize(kwargs.pop('width', 100), kwargs.pop('height', 25))
-        QtWidgets.QTabBar.__init__(self, parent, *args, **kwargs)
+        super().__init__(parent)
 
     def paintEvent(self, event):
         """
@@ -215,11 +215,11 @@ class FingerTabWidget(QtWidgets.QTabWidget):
     Based on thread discussion
     http://www.riverbankcomputing.com/pipermail/pyqt/2005-December/011724.html
     """
-    def __init__(self, parent, *args):
+    def __init__(self, parent):
         """
         Initialize FingerTabWidget instance
         """
-        QtWidgets.QTabWidget.__init__(self, parent, *args)
+        super().__init__(parent)
         self.setTabBar(FingerTabBarWidget(self))
 
 
diff --git a/openlp/core/ui/__init__.py b/openlp/core/ui/__init__.py
index 220bda7ce..2e9a7a48c 100644
--- a/openlp/core/ui/__init__.py
+++ b/openlp/core/ui/__init__.py
@@ -93,4 +93,4 @@ class SingleColumnTableWidget(QtWidgets.QTableWidget):
             self.resizeRowsToContents()
 
 
-__all__ = ['SingleColumnTableWidget', 'DisplayControllerType']
+__all__ = ['AlertLocation', 'DisplayControllerType', 'HideMode', 'SingleColumnTableWidget']
diff --git a/openlp/core/ui/formattingtagcontroller.py b/openlp/core/ui/formattingtagcontroller.py
index 5b26851b5..0b88702aa 100644
--- a/openlp/core/ui/formattingtagcontroller.py
+++ b/openlp/core/ui/formattingtagcontroller.py
@@ -40,7 +40,7 @@ class FormattingTagController(object):
         """
         self.html_tag_regex = re.compile(
             r'<(?:(?P<close>/(?=[^\s/>]+>))?'
-            r'(?P<tag>[^\s/!\?>]+)(?:\s+[^\s=]+="[^"]*")*\s*(?P<empty>/)?'
+            r'(?P<tag>[^\s/!?>]+)(?:\s+[^\s=]+="[^"]*")*\s*(?P<empty>/)?'
             r'|(?P<cdata>!\[CDATA\[(?:(?!\]\]>).)*\]\])'
             r'|(?P<procinst>\?(?:(?!\?>).)*\?)'
             r'|(?P<comment>!--(?:(?!-->).)*--))>')
diff --git a/openlp/core/ui/icons.py b/openlp/core/ui/icons.py
index 925becf1f..701c25a09 100644
--- a/openlp/core/ui/icons.py
+++ b/openlp/core/ui/icons.py
@@ -45,8 +45,8 @@ class UiIcons(object):
         Override the default object creation method to return a single instance.
         """
         if not cls.__instance__:
-            cls.__instance__ = object.__new__(cls)
-            cls.load(cls)
+            cls.__instance__ = super().__new__(cls)
+            cls.__instance__.load()
         return cls.__instance__
 
     def load(self):
@@ -164,7 +164,7 @@ class UiIcons(object):
             'video': {'icon': 'fa.file-video-o'},
             'volunteer': {'icon': 'fa.group'}
         }
-        self.load_icons(self, icon_list)
+        self.load_icons(icon_list)
 
     def load_icons(self, icon_list):
         """
diff --git a/openlp/core/ui/shortcutlistdialog.py b/openlp/core/ui/shortcutlistdialog.py
index efc795501..a6440b63f 100644
--- a/openlp/core/ui/shortcutlistdialog.py
+++ b/openlp/core/ui/shortcutlistdialog.py
@@ -101,7 +101,7 @@ class Ui_ShortcutListDialog(object):
         self.primary_push_button = CaptureShortcutButton(shortcutListDialog)
         self.primary_push_button.setObjectName('primary_push_button')
         self.primary_push_button.setMinimumSize(QtCore.QSize(84, 0))
-        self.primary_push_button.setIcon(UiIcons.shortcuts)
+        self.primary_push_button.setIcon(UiIcons().shortcuts)
         self.primary_layout.addWidget(self.primary_push_button)
         self.clear_primary_button = QtWidgets.QToolButton(shortcutListDialog)
         self.clear_primary_button.setObjectName('clear_primary_button')
diff --git a/openlp/core/ui/shortcutlistform.py b/openlp/core/ui/shortcutlistform.py
index 360c631c0..6d37130ab 100644
--- a/openlp/core/ui/shortcutlistform.py
+++ b/openlp/core/ui/shortcutlistform.py
@@ -34,7 +34,7 @@ from openlp.core.common.settings import Settings
 from openlp.core.ui.shortcutlistdialog import Ui_ShortcutListDialog
 
 
-REMOVE_AMPERSAND = re.compile(r'&{1}')
+REMOVE_AMPERSAND = re.compile(r'&')
 
 log = logging.getLogger(__name__)
 
diff --git a/openlp/core/widgets/views.py b/openlp/core/widgets/views.py
index b5c07993c..c3f4be0ca 100644
--- a/openlp/core/widgets/views.py
+++ b/openlp/core/widgets/views.py
@@ -80,7 +80,7 @@ class ListPreviewWidget(QtWidgets.QTableWidget, RegistryProperties):
         An empty ``ServiceItem`` is used by default. replace_service_manager_item() needs to be called to make this
         widget display something.
         """
-        super(QtWidgets.QTableWidget, self).__init__(parent)
+        super().__init__(parent)
         self._setup(screen_ratio)
 
     def _setup(self, screen_ratio):
@@ -124,7 +124,7 @@ class ListPreviewWidget(QtWidgets.QTableWidget, RegistryProperties):
                 max_img_row_height = Settings().value('advanced/slide max height')
                 # Adjust for row height cap if in use.
                 if isinstance(max_img_row_height, int):
-                    if max_img_row_height > 0 and height > max_img_row_height:
+                    if 0 < max_img_row_height < height:
                         height = max_img_row_height
                     elif max_img_row_height < 0:
                         # If auto setting, show that number of slides, or if the resulting slides too small, 100px.
@@ -219,7 +219,7 @@ class ListPreviewWidget(QtWidgets.QTableWidget, RegistryProperties):
                 slide_height = width // self.screen_ratio
                 max_img_row_height = Settings().value('advanced/slide max height')
                 if isinstance(max_img_row_height, int):
-                    if max_img_row_height > 0 and slide_height > max_img_row_height:
+                    if 0 < max_img_row_height < slide_height:
                         slide_height = max_img_row_height
                     elif max_img_row_height < 0:
                         # If auto setting, show that number of slides, or if the resulting slides too small, 100px.
diff --git a/openlp/core/widgets/widgets.py b/openlp/core/widgets/widgets.py
index 0415d73a5..42f83511d 100644
--- a/openlp/core/widgets/widgets.py
+++ b/openlp/core/widgets/widgets.py
@@ -194,11 +194,11 @@ class ScreenButton(QtWidgets.QPushButton):
 
 
 class ScreenSelectionWidget(QtWidgets.QWidget):
-    def __init__(self, parent=None, screens=[]):
+    def __init__(self, parent=None, screens=None):
         super().__init__(parent)
         self.current_screen = None
         self.identify_labels = []
-        self.screens = screens
+        self.screens = screens or []
         self.timer = QtCore.QTimer()
         self.timer.setSingleShot(True)
         self.timer.setInterval(3000)
diff --git a/openlp/plugins/bibles/lib/manager.py b/openlp/plugins/bibles/lib/manager.py
index 79f66cef4..53926d78b 100644
--- a/openlp/plugins/bibles/lib/manager.py
+++ b/openlp/plugins/bibles/lib/manager.py
@@ -401,4 +401,4 @@ class BibleManager(LogMixin, RegistryProperties):
             self.db_cache[bible].finalise()
 
 
-__all__ = ['BibleFormat']
+__all__ = ['BibleFormat', 'BibleManager']
diff --git a/openlp/plugins/bibles/lib/mediaitem.py b/openlp/plugins/bibles/lib/mediaitem.py
index 185a6832e..b239defdd 100755
--- a/openlp/plugins/bibles/lib/mediaitem.py
+++ b/openlp/plugins/bibles/lib/mediaitem.py
@@ -109,7 +109,7 @@ class BibleMediaItem(MediaManagerItem):
         :param kwargs: Keyword arguments to pass to the super method. (dict)
         """
         self.clear_icon = UiIcons().square
-        self.save_results_icon = UiIcons.save
+        self.save_results_icon = UiIcons().save
         self.sort_icon = UiIcons().sort
         self.bible = None
         self.second_bible = None
diff --git a/openlp/plugins/presentations/lib/impresscontroller.py b/openlp/plugins/presentations/lib/impresscontroller.py
index 873e91b86..dd8ad9df4 100644
--- a/openlp/plugins/presentations/lib/impresscontroller.py
+++ b/openlp/plugins/presentations/lib/impresscontroller.py
@@ -55,7 +55,7 @@ if is_win():
         class SlideShowListenerImport(XSlideShowListenerObj.__class__):
             pass
     except (AttributeError, pywintypes.com_error):
-        class SlideShowListenerImport():
+        class SlideShowListenerImport(object):
             pass
 
     # Declare an empty exception to match the exception imported from UNO
@@ -76,7 +76,7 @@ else:
     except ImportError:
         uno_available = False
 
-        class SlideShowListenerImport():
+        class SlideShowListenerImport(object):
             pass
 
 log = logging.getLogger(__name__)
@@ -233,9 +233,7 @@ class ImpressController(PresentationController):
                 self.conf_provider = self.manager.createInstanceWithContext(
                     'com.sun.star.configuration.ConfigurationProvider', uno.getComponentContext())
         # Setup lookup properties to get Impress settings
-        properties = []
-        properties.append(self.create_property('nodepath', 'org.openoffice.Office.Impress'))
-        properties = tuple(properties)
+        properties = tuple(self.create_property('nodepath', 'org.openoffice.Office.Impress'))
         try:
             # Get an updateable configuration view
             impress_conf_props = self.conf_provider.createInstanceWithArguments(
@@ -311,9 +309,7 @@ class ImpressDocument(PresentationDocument):
         if desktop is None:
             return False
         self.desktop = desktop
-        properties = []
-        properties.append(self.controller.create_property('Hidden', True))
-        properties = tuple(properties)
+        properties = tuple(self.controller.create_property('Hidden', True))
         try:
             self.document = desktop.loadComponentFromURL(url, '_blank', 0, properties)
         except Exception:
@@ -338,9 +334,7 @@ class ImpressDocument(PresentationDocument):
             return
         temp_folder_path = self.get_temp_folder()
         thumb_dir_url = temp_folder_path.as_uri()
-        properties = []
-        properties.append(self.controller.create_property('FilterName', 'impress_png_Export'))
-        properties = tuple(properties)
+        properties = tuple(self.controller.create_property('FilterName', 'impress_png_Export'))
         doc = self.document
         pages = doc.getDrawPages()
         if not pages:
diff --git a/openlp/plugins/songs/lib/__init__.py b/openlp/plugins/songs/lib/__init__.py
index e79dbc95a..243eedcc8 100644
--- a/openlp/plugins/songs/lib/__init__.py
+++ b/openlp/plugins/songs/lib/__init__.py
@@ -615,14 +615,16 @@ def transpose_chord(chord, transpose_value, notation):
     :return: The transposed chord.
     """
     # See https://en.wikipedia.org/wiki/Musical_note#12-tone_chromatic_scale
-    notes_sharp_notation = {}
-    notes_flat_notation = {}
-    notes_sharp_notation['german'] = ['C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#', 'A', 'A#', 'H']
-    notes_flat_notation['german'] = ['C', 'Db', 'D', 'Eb', 'Fb', 'F', 'Gb', 'G', 'Ab', 'A', 'B', 'H']
-    notes_sharp_notation['english'] = ['C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#', 'A', 'A#', 'B']
-    notes_flat_notation['english'] = ['C', 'Db', 'D', 'Eb', 'Fb', 'F', 'Gb', 'G', 'Ab', 'A', 'Bb', 'B']
-    notes_sharp_notation['neo-latin'] = ['Do', 'Do#', 'Re', 'Re#', 'Mi', 'Fa', 'Fa#', 'Sol', 'Sol#', 'La', 'La#', 'Si']
-    notes_flat_notation['neo-latin'] = ['Do', 'Reb', 'Re', 'Mib', 'Fab', 'Fa', 'Solb', 'Sol', 'Lab', 'La', 'Sib', 'Si']
+    notes_sharp_notation = {
+        'german': ['C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#', 'A', 'A#', 'H'],
+        'english': ['C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#', 'A', 'A#', 'B'],
+        'neo-latin': ['Do', 'Do#', 'Re', 'Re#', 'Mi', 'Fa', 'Fa#', 'Sol', 'Sol#', 'La', 'La#', 'Si']
+    }
+    notes_flat_notation = {
+        'german': ['C', 'Db', 'D', 'Eb', 'Fb', 'F', 'Gb', 'G', 'Ab', 'A', 'B', 'H'],
+        'english': ['C', 'Db', 'D', 'Eb', 'Fb', 'F', 'Gb', 'G', 'Ab', 'A', 'Bb', 'B'],
+        'neo-latin': ['Do', 'Reb', 'Re', 'Mib', 'Fab', 'Fa', 'Solb', 'Sol', 'Lab', 'La', 'Sib', 'Si']
+    }
     chord_split = chord.replace('♭', 'b').split('/')
     transposed_chord = ''
     last_chord = ''
diff --git a/openlp/plugins/songs/lib/importers/easyworship.py b/openlp/plugins/songs/lib/importers/easyworship.py
index 9468031fa..2061195d3 100644
--- a/openlp/plugins/songs/lib/importers/easyworship.py
+++ b/openlp/plugins/songs/lib/importers/easyworship.py
@@ -118,8 +118,8 @@ class EasyWorshipSongImport(SongImport):
         # 40/48/56 Entry count        int32le           4    Number of items in the schedule
         # 44/52/60 Entry length       int16le           2    Length of schedule entries: 0x0718 = 1816
         # Get file version
-        type, = struct.unpack('<38s', self.ews_file.read(38))
-        version = type.decode()[-3:]
+        file_type, = struct.unpack('<38s', self.ews_file.read(38))
+        version = file_type.decode()[-3:]
         # Set fileposition based on filetype/version
         file_pos = 0
         if version == '  5':
diff --git a/openlp/plugins/songs/lib/importers/foilpresenter.py b/openlp/plugins/songs/lib/importers/foilpresenter.py
index da16c9b9e..ed64210b6 100644
--- a/openlp/plugins/songs/lib/importers/foilpresenter.py
+++ b/openlp/plugins/songs/lib/importers/foilpresenter.py
@@ -302,7 +302,7 @@ class FoilPresenter(object):
                     break
             author_temp = []
             for author in strings:
-                temp = re.split(r',(?=\D{2})|(?<=\D),|\/(?=\D{3,})|(?<=\D);', author)
+                temp = re.split(r',(?=\D{2})|(?<=\D),|/(?=\D{3,})|(?<=\D);', author)
                 for tempx in temp:
                     author_temp.append(tempx)
                 for author in author_temp:
diff --git a/openlp/plugins/songs/lib/importers/openoffice.py b/openlp/plugins/songs/lib/importers/openoffice.py
index 2346dc039..0fc057e82 100644
--- a/openlp/plugins/songs/lib/importers/openoffice.py
+++ b/openlp/plugins/songs/lib/importers/openoffice.py
@@ -145,9 +145,7 @@ class OpenOfficeImport(SongImport):
         """
         self.file_path = file_path
         url = file_path.as_uri()
-        properties = []
-        properties.append(self.create_property('Hidden', True))
-        properties = tuple(properties)
+        properties = tuple(self.create_property('Hidden', True))
         try:
             self.document = self.desktop.loadComponentFromURL(url, '_blank', 0, properties)
             if not self.document.supportsService("com.sun.star.presentation.PresentationDocument") and not \
diff --git a/openlp/plugins/songs/lib/importers/opspro.py b/openlp/plugins/songs/lib/importers/opspro.py
index ece7dc41e..2ad14487e 100644
--- a/openlp/plugins/songs/lib/importers/opspro.py
+++ b/openlp/plugins/songs/lib/importers/opspro.py
@@ -136,8 +136,8 @@ class OPSProImport(SongImport):
                     verse_text = re.sub(r'^\d+\r\n', '', verse_text)
                     verse_def = 'v' + verse_number.group(1)
                 # Detect verse tags
-                elif re.match(r'^.+?\:\r\n', verse_text):
-                    tag_match = re.match(r'^(.+?)\:\r\n(.*)', verse_text, flags=re.DOTALL)
+                elif re.match(r'^.+?:\r\n', verse_text):
+                    tag_match = re.match(r'^(.+?):\r\n(.*)', verse_text, flags=re.DOTALL)
                     tag = tag_match.group(1).lower()
                     tag = tag.split(' ')[0]
                     verse_text = tag_match.group(2)
diff --git a/openlp/plugins/songs/lib/importers/propresenter.py b/openlp/plugins/songs/lib/importers/propresenter.py
index 0d666e449..05ac8aff5 100644
--- a/openlp/plugins/songs/lib/importers/propresenter.py
+++ b/openlp/plugins/songs/lib/importers/propresenter.py
@@ -80,7 +80,7 @@ class ProPresenterImport(SongImport):
                 self.parse_author(author)
 
         # ProPresenter 4
-        if(self.version >= 400 and self.version < 500):
+        if 400 <= self.version < 500:
             self.copyright = root.get('CCLICopyrightInfo')
             self.ccli_number = root.get('CCLILicenseNumber')
             count = 0
@@ -95,7 +95,7 @@ class ProPresenterImport(SongImport):
                 self.add_verse(words, "v{count}".format(count=count))
 
         # ProPresenter 5
-        elif(self.version >= 500 and self.version < 600):
+        elif 500 <= self.version < 600:
             self.copyright = root.get('CCLICopyrightInfo')
             self.ccli_number = root.get('CCLILicenseNumber')
             count = 0
@@ -111,7 +111,7 @@ class ProPresenterImport(SongImport):
                     self.add_verse(words, "v{count:d}".format(count=count))
 
         # ProPresenter 6
-        elif(self.version >= 600 and self.version < 700):
+        elif 600 <= self.version < 700:
             self.copyright = root.get('CCLICopyrightYear')
             self.ccli_number = root.get('CCLISongNumber')
             count = 0
@@ -128,7 +128,7 @@ class ProPresenterImport(SongImport):
                             b64Data = contents.text
                             data = base64.standard_b64decode(b64Data)
                             words = None
-                            if(contents.get('rvXMLIvarName') == "RTFData"):
+                            if contents.get('rvXMLIvarName') == "RTFData":
                                 words, encoding = strip_rtf(data.decode())
                                 break
                         if words:
diff --git a/openlp/plugins/songs/lib/importers/videopsalm.py b/openlp/plugins/songs/lib/importers/videopsalm.py
index bc0e06093..ff3eec52b 100644
--- a/openlp/plugins/songs/lib/importers/videopsalm.py
+++ b/openlp/plugins/songs/lib/importers/videopsalm.py
@@ -75,7 +75,7 @@ class VideoPsalmImport(SongImport):
                         c = next(file_content_it)
                     processed_content += '"' + c
                 # Remove control characters
-                elif (c < chr(32)):
+                elif c < chr(32):
                     processed_content += ' '
                 # Handle escaped characters
                 elif c == '\\':
diff --git a/openlp/plugins/songs/lib/openlyricsxml.py b/openlp/plugins/songs/lib/openlyricsxml.py
index efa3103d2..7cb1f7a38 100644
--- a/openlp/plugins/songs/lib/openlyricsxml.py
+++ b/openlp/plugins/songs/lib/openlyricsxml.py
@@ -221,7 +221,7 @@ class OpenLyrics(object):
     """
     IMPLEMENTED_VERSION = '0.8'
     START_TAGS_REGEX = re.compile(r'\{(\w+)\}')
-    END_TAGS_REGEX = re.compile(r'\{\/(\w+)\}')
+    END_TAGS_REGEX = re.compile(r'\{/(\w+)\}')
     VERSE_TAG_SPLITTER = re.compile('([a-zA-Z]+)([0-9]*)([a-zA-Z]?)')
 
     def __init__(self, manager):
diff --git a/tests/functional/openlp_core/lib/test_image_manager.py b/tests/functional/openlp_core/lib/test_image_manager.py
index 10470f0f6..1f6e0e326 100644
--- a/tests/functional/openlp_core/lib/test_image_manager.py
+++ b/tests/functional/openlp_core/lib/test_image_manager.py
@@ -32,7 +32,7 @@ from PyQt5 import QtGui
 
 from openlp.core.common.registry import Registry
 from openlp.core.display.screens import ScreenList
-from openlp.core.lib.imagemanager import ImageManager, ImageWorker, Priority, PriorityQueue
+from openlp.core.lib.imagemanager import Image, ImageManager, ImageWorker, Priority, PriorityQueue
 from tests.helpers.testmixin import TestMixin
 from tests.utils.constants import RESOURCE_PATH
 
diff --git a/tests/functional/openlp_core/lib/test_theme.py b/tests/functional/openlp_core/lib/test_theme.py
index f53d4367c..e7f935918 100644
--- a/tests/functional/openlp_core/lib/test_theme.py
+++ b/tests/functional/openlp_core/lib/test_theme.py
@@ -25,7 +25,78 @@ Package to test the openlp.core.lib.theme package.
 from pathlib import Path
 from unittest import TestCase
 
-from openlp.core.lib.theme import Theme
+from openlp.core.lib.theme import BackgroundType
+
+
+class TestBackgroundType(TestCase):
+    """
+    Test the BackgroundType enum methods.
+    """
+    def test_solid_to_string(self):
+        """
+        Test the to_string method of :class:`BackgroundType`
+        """
+        # GIVEN: A BackgroundType member
+        background_type = BackgroundType.Solid
+
+        # WHEN: Calling BackgroundType.to_string
+        # THEN: The string equivalent should have been returned
+        assert BackgroundType.to_string(background_type) == 'solid'
+
+    def test_gradient_to_string(self):
+        """
+        Test the to_string method of :class:`BackgroundType`
+        """
+        # GIVEN: A BackgroundType member
+        background_type = BackgroundType.Gradient
+
+        # WHEN: Calling BackgroundType.to_string
+        # THEN: The string equivalent should have been returned
+        assert BackgroundType.to_string(background_type) == 'gradient'
+
+    def test_image_to_string(self):
+        """
+        Test the to_string method of :class:`BackgroundType`
+        """
+        # GIVEN: A BackgroundType member
+        background_type = BackgroundType.Image
+
+        # WHEN: Calling BackgroundType.to_string
+        # THEN: The string equivalent should have been returned
+        assert BackgroundType.to_string(background_type) == 'image'
+
+    def test_transparent_to_string(self):
+        """
+        Test the to_string method of :class:`BackgroundType`
+        """
+        # GIVEN: A BackgroundType member
+        background_type = BackgroundType.Transparent
+
+        # WHEN: Calling BackgroundType.to_string
+        # THEN: The string equivalent should have been returned
+        assert BackgroundType.to_string(background_type) == 'transparent'
+
+    def test_video_to_string(self):
+        """
+        Test the to_string method of :class:`BackgroundType`
+        """
+        # GIVEN: A BackgroundType member
+        background_type = BackgroundType.Video
+
+        # WHEN: Calling BackgroundType.to_string
+        # THEN: The string equivalent should have been returned
+        assert BackgroundType.to_string(background_type) == 'video'
+
+    def test_stream_to_string(self):
+        """
+        Test the to_string method of :class:`BackgroundType`
+        """
+        # GIVEN: A BackgroundType member
+        background_type = BackgroundType.Stream
+
+        # WHEN: Calling BackgroundType.to_string
+        # THEN: The string equivalent should have been returned
+        assert BackgroundType.to_string(background_type) == 'stream'
 
 
 class TestTheme(TestCase):