diff --git a/ORStools/common/isochrones_core.py b/ORStools/common/isochrones_core.py
index 4da3cfe8..99cc73b8 100644
--- a/ORStools/common/isochrones_core.py
+++ b/ORStools/common/isochrones_core.py
@@ -60,7 +60,8 @@ def __init__(self):
 
     def set_parameters(self, profile, dimension, factor, id_field_type=QVariant.String, id_field_name='ID'):
         """
-        Sets all parameters defined in __init__, because processing algorithm calls this class when it doesn't know its parameters yet.
+        Sets all parameters defined in __init__, because processing algorithm calls this class when it doesn't know
+        its parameters yet.
 
         :param profile: Transportation mode being used
         :type profile: str
@@ -116,8 +117,7 @@ def get_features(self, response, id_field_value):
 
         # Sort features based on the isochrone value, so that longest isochrone
         # is added first. This will plot the isochrones on top of each other.
-        l = lambda x: x['properties']['value']
-        for isochrone in sorted(response['features'], key=l, reverse=True):
+        for isochrone in sorted(response['features'], key=lambda x: x['properties']['value'], reverse=True):
             feat = QgsFeature()
             coordinates = isochrone['geometry']['coordinates']
             iso_value = isochrone['properties']['value']
diff --git a/ORStools/gui/ORStoolsDialog.py b/ORStools/gui/ORStoolsDialog.py
index 477c36a4..96d7a492 100644
--- a/ORStools/gui/ORStoolsDialog.py
+++ b/ORStools/gui/ORStoolsDialog.py
@@ -76,14 +76,18 @@ def on_help_click():
 def on_about_click(parent):
     """Slot for click event of About button/menu entry."""
 
-    info = f'<b>ORS Tools</b> provides access to <a href="https://openrouteservice.org" style="color: {DEFAULT_COLOR}">openrouteservice</a> routing functionalities.<br><br>' \
+    info = f'<b>ORS Tools</b> provides access to <a href="https://openrouteservice.org"' \
+           f' style="color: {DEFAULT_COLOR}">openrouteservice</a> routing functionalities.' \
+           f'<br><br>' \
            f'<center>' \
-           f'<a href=\"https://heigit.org/de/willkommen\"><img src=\":/plugins/ORStools/img/logo_heigit_300.png\"/></a> <br><br>' \
+           f'<a href=\"https://heigit.org/de/willkommen\"><img src=\":/plugins/ORStools/img/logo_heigit_300.png\"/>' \
+           f'</a><br><br>' \
            f'</center>' \
            f'Author: HeiGIT gGmbH<br>' \
            f'Email: <a href="mailto:Openrouteservice <{__email__}>">{__email__}</a><br>' \
            f'Web: <a href="{__web__}">{__web__}</a><br>' \
-           f'Repo: <a href="https://github.com/GIScience/orstools-qgis-plugin">github.com/GIScience/orstools-qgis-plugin</a><br>' \
+           f'Repo: <a href="https://github.com/GIScience/orstools-qgis-plugin">' \
+           f'github.com/GIScience/orstools-qgis-plugin</a><br>' \
            f'Version: {__version__}'
 
     QMessageBox.information(
@@ -258,9 +262,9 @@ def run_gui_control(self):
                 """
                 Did you forget to set an <b>API key</b> for openrouteservice?<br><br>
                 
-                If you don't have an API key, please visit https://openrouteservice.org/sign-up to get one. <br><br>
-                Then enter the API key for openrouteservice provider in Web ► ORS Tools ► Provider Settings or the settings symbol in the main ORS Tools GUI, next to the provider dropdown.
-                """
+                If you don't have an API key, please visit https://openrouteservice.org/sign-up to get one. <br><br> 
+                Then enter the API key for openrouteservice provider in Web ► ORS Tools ► Provider Settings or the 
+                settings symbol in the main ORS Tools GUI, next to the provider dropdown."""
             )
             return
 
@@ -379,7 +383,7 @@ def __init__(self, iface, parent=None):
         self.global_buttons.button(QDialogButtonBox.Ok).setText('Apply')
         self.global_buttons.button(QDialogButtonBox.Cancel).setText('Close')
 
-        #### Set up signals/slots ####
+        # Set up signals/slots
 
         # Config/Help dialogs
         self.provider_config.clicked.connect(lambda: on_config_click(self))
diff --git a/ORStools/proc/isochrones_layer_proc.py b/ORStools/proc/isochrones_layer_proc.py
index 7cbb6cba..911342eb 100644
--- a/ORStools/proc/isochrones_layer_proc.py
+++ b/ORStools/proc/isochrones_layer_proc.py
@@ -213,7 +213,7 @@ def processAlgorithm(self, parameters, context, feedback):
 
         # LookupField will return -1 if the name cannot be found.
         # Try the first field in this case.
-        if id_field_id == -1: 
+        if id_field_id == -1:
             id_field_id = 0
 
         # Populate iso_layer instance with parameters