diff --git a/libpurple_to_markdown/__init__.py b/libpurple_to_markdown/__init__.py
index 1241291..b5eeca7 100644
--- a/libpurple_to_markdown/__init__.py
+++ b/libpurple_to_markdown/__init__.py
@@ -24,11 +24,12 @@ python -m libpurple_to_markdown LOG_DIRECTORY --output OUTPUT_FOLDER
 It was made specifically for import into Obsidian, so it might not suite your
 purposes, but it shouldn't be too difficult to adjust.
 """
+
 import dataclasses
 import datetime
-from collections.abc import Iterator, Iterable
 import logging
 import re
+from collections.abc import Iterable, Iterator
 from pathlib import Path
 
 import bs4
@@ -53,10 +54,13 @@ class Message:
 
 
 def datetime_sent(
-    chat_start: datetime.datetime, message_sent: datetime.time,
+    chat_start: datetime.datetime,
+    message_sent: datetime.time,
 ) -> datetime.datetime:
     naive = datetime.datetime.combine(
-        chat_start.date(), message_sent, chat_start.tzinfo,
+        chat_start.date(),
+        message_sent,
+        chat_start.tzinfo,
     )
     if chat_start.time() > message_sent:
         naive = naive + datetime.timedelta(days=1)
@@ -103,7 +107,13 @@ def parse_messages_in_chat_file(path: Path) -> list[Message]:
             # Get sender
             if c.b:
                 assert cur_sender is None
-                cur_sender = c.b.get_text().strip().removesuffix(':').removeprefix('***').removesuffix('[m]')
+                cur_sender = (
+                    c.b.get_text()
+                    .strip()
+                    .removesuffix(':')
+                    .removeprefix('***')
+                    .removesuffix('[m]')
+                )
 
         elif c.name in {None, 'span', 'font'}:
             cur_text += c.get_text()
@@ -183,9 +193,11 @@ def format_messages(messages: list[Message], title: str) -> str:
 
 MSG_ADJACENTCY_DIST = datetime.timedelta(minutes=2)
 
+
 def is_useless_message(msg: Message) -> bool:
     return msg.sender.endswith('<AUTO-REPLY>') or msg.sender == ''
 
+
 def filter_useless_messages(messages: Iterable[Message]) -> Iterator[Message]:
     for msg in messages:
         if not is_useless_message(msg):
@@ -193,6 +205,7 @@ def filter_useless_messages(messages: Iterable[Message]) -> Iterator[Message]:
         else:
             print(msg.text)
 
+
 def is_adjacent_messages(first: Message, second: Message) -> bool:
     return (
         first.sender == second.sender
@@ -211,7 +224,8 @@ def merge_adjacent_messages(messages: Iterable[Message]) -> list[Message]:
     for msg in messages:
         if out and is_adjacent_messages(out[-1], msg):
             out[-1] = dataclasses.replace(
-                out[-1], text=merge_texts(out[-1].text, msg.text),
+                out[-1],
+                text=merge_texts(out[-1].text, msg.text),
             )
         else:
             out.append(msg)
diff --git a/libpurple_to_markdown/__main__.py b/libpurple_to_markdown/__main__.py
index a060e5d..5ee2a21 100644
--- a/libpurple_to_markdown/__main__.py
+++ b/libpurple_to_markdown/__main__.py
@@ -1,21 +1,27 @@
 import argparse
 import logging
 from pathlib import Path
-import logging
 
-from . import (format_messages, merge_adjacent_messages,
-               parse_messages_in_chat_folder, Message, filter_useless_messages)
+from . import (
+    Message,
+    filter_useless_messages,
+    format_messages,
+    merge_adjacent_messages,
+    parse_messages_in_chat_folder,
+)
 
 logger = logging.getLogger(__name__)
 
+
 def group_messages_by_period(messages: list[Message]) -> dict[str, list[Message]]:
-    by_period: dict[str,list[Message]] = {}
+    by_period: dict[str, list[Message]] = {}
     for msg in messages:
         period_key = f'{msg.sent_at.year}-{msg.sent_at.month:02}'
         by_period.setdefault(period_key, []).append(msg)
         del msg
     return by_period
 
+
 def parse_args():
     parser = argparse.ArgumentParser()
     parser.add_argument('path', type=Path)
@@ -39,9 +45,14 @@ def main():
 
     for period_key, messages in messages_by_period.items():
         output_file = args.output / f'{server} - {receipient} - {period_key}.md'
-        logger.info("Writing % 5d messages to %s", len(messages), output_file)
+        logger.info('Writing % 5d messages to %s', len(messages), output_file)
         with open(output_file, 'w') as f:
-            f.write(format_messages(messages, title = f'{server} - {receipient} - {period_key}'))
+            f.write(
+                format_messages(
+                    messages,
+                    title=f'{server} - {receipient} - {period_key}',
+                ),
+            )
 
         del period_key, messages, output_file