diff --git a/git_time_tracker/__init__.py b/git_time_tracker/__init__.py
index ac47b11..fbac5ff 100644
--- a/git_time_tracker/__init__.py
+++ b/git_time_tracker/__init__.py
@@ -39,7 +39,7 @@ from .data import (
     WorkSample,
 )
 from .format import cli, icalendar
-from .source import git_repo, csv_file
+from .source import csv_file, git_repo
 
 logger = logging.getLogger(__name__)
 
@@ -51,7 +51,8 @@ MINUTE = datetime.timedelta(minutes=1)
 
 
 def filter_samples(
-    samples: list[WorkSample], sample_filter: set[str],
+    samples: list[WorkSample],
+    sample_filter: set[str],
 ) -> list[WorkSample]:
     assert len(sample_filter) > 0
     return [s for s in samples if set(s.labels).intersection(sample_filter)]
@@ -122,6 +123,7 @@ def parse_arguments():
     )
     return parser.parse_args()
 
+
 def load_samples(args):
     shared_time_stamps_set: set[WorkSample] = set()
 
@@ -141,9 +143,9 @@ def load_samples(args):
         )
         del csv_path
 
-
     return shared_time_stamps_set
 
+
 def main():
     logging.basicConfig()
 
@@ -173,5 +175,6 @@ def main():
             sys.stdout.write(t)
     elif args.format_mode == 'icalendar':
         icalendar.generate_icalendar_file(
-            shared_time_stamps, file='./output/samples.ics',
+            shared_time_stamps,
+            file='./output/samples.ics',
         )
diff --git a/git_time_tracker/format/icalendar.py b/git_time_tracker/format/icalendar.py
index ccfab78..d3232b5 100644
--- a/git_time_tracker/format/icalendar.py
+++ b/git_time_tracker/format/icalendar.py
@@ -9,7 +9,7 @@ HOUR = datetime.timedelta(hours=1)
 MINUTE = datetime.timedelta(minutes=1)
 
 
-def create_title(sample: RealizedWorkSample) -> tuple[str,str]:
+def create_title(sample: RealizedWorkSample) -> tuple[str, str]:
     ls = []
     desc = []
     for label_and_type in sample.labels:
@@ -47,7 +47,8 @@ def generate_calendar(
         for label_and_type in sample.labels:
             if label_and_type.startswith('author:'):
                 event.add(
-                    'organizer', 'mailto:' + label_and_type.removeprefix('author:'),
+                    'organizer',
+                    'mailto:' + label_and_type.removeprefix('author:'),
                 )
 
         cal.add_component(event)
diff --git a/git_time_tracker/source/csv_file.py b/git_time_tracker/source/csv_file.py
index 29acb63..657ceea 100644
--- a/git_time_tracker/source/csv_file.py
+++ b/git_time_tracker/source/csv_file.py
@@ -1,25 +1,26 @@
-import argparse
-from collections.abc import Iterator
-from decimal import Decimal
 import datetime
 import urllib.parse
+from collections.abc import Iterator
+from decimal import Decimal
 from pathlib import Path
 
 from personal_data.util import load_csv_file
 
 from ..data import WorkSample
 
+
 def iterate_samples_from_dicts(rows: list[dict]) -> Iterator[WorkSample]:
     max_title_parts = 2
 
     for event_data in rows:
-
         # Select data
         possible_time_keys = [
             k for k, v in event_data.items() if isinstance(v, datetime.date)
         ]
         possible_duration_keys = [
-            k for k, v in event_data.items() if isinstance(v, Decimal) and 'duration_seconds' in k
+            k
+            for k, v in event_data.items()
+            if isinstance(v, Decimal) and 'duration_seconds' in k
         ]
         possible_name_keys = [k for k, v in event_data.items() if isinstance(v, str)]
         possible_image_keys = [
@@ -31,7 +32,7 @@ def iterate_samples_from_dicts(rows: list[dict]) -> Iterator[WorkSample]:
             if k in possible_misc_keys:
                 possible_misc_keys.remove(k)
             del k
-        for k in possible_time_keys :
+        for k in possible_time_keys:
             if k in possible_misc_keys:
                 possible_misc_keys.remove(k)
             del k
@@ -45,14 +46,16 @@ def iterate_samples_from_dicts(rows: list[dict]) -> Iterator[WorkSample]:
         if len(possible_duration_keys) > 0:
             start_at = date
             seconds = event_data[possible_duration_keys[0]]
-            end_at = date + datetime.timedelta(seconds = float(seconds))
+            end_at = date + datetime.timedelta(seconds=float(seconds))
             del seconds
         else:
             start_at = None
             end_at = date
 
         title = ': '.join(event_data[k] for k in possible_name_keys[:max_title_parts])
-        description = '\n\n'.join(event_data[k] for k in possible_name_keys[max_title_parts:])
+        description = '\n\n'.join(
+            event_data[k] for k in possible_name_keys[max_title_parts:]
+        )
 
         labels = [f'{k}:{event_data[k]}' for k in possible_misc_keys]
 
@@ -65,6 +68,7 @@ def iterate_samples_from_dicts(rows: list[dict]) -> Iterator[WorkSample]:
 
         del event_data
 
+
 def iterate_samples_from_csv_file(file_path: Path) -> Iterator[WorkSample]:
     dicts = load_csv_file(file_path)
     yield from iterate_samples_from_dicts(dicts)
diff --git a/git_time_tracker/source/git_repo.py b/git_time_tracker/source/git_repo.py
index b7e7800..67839aa 100644
--- a/git_time_tracker/source/git_repo.py
+++ b/git_time_tracker/source/git_repo.py
@@ -39,10 +39,12 @@ def get_samples_from_project(repo: git.Repo) -> Iterator[WorkSample]:
         labels.append('author:' + commit.author.email)
 
         authored_date = datetime.datetime.fromtimestamp(
-            commit.authored_date, tz=datetime.UTC,
+            commit.authored_date,
+            tz=datetime.UTC,
         )
         committed_date = datetime.datetime.fromtimestamp(
-            commit.committed_date, tz=datetime.UTC,
+            commit.committed_date,
+            tz=datetime.UTC,
         )
 
         yield WorkSample(