Fix Python 3.8 compatibility and flake8 config

- Replace list[T] with List[T] from typing for Python 3.8
- Replace tuple[T] with Tuple[T] from typing
- Fix .flake8 config by removing inline comments (not supported)

Author: shankarpandala

.flake8

@@ -9,7 +9,4 @@ exclude =
     *.egg-info,
     venv,
     env
-ignore = 
-    E203,  # whitespace before ':'
-    E501,  # line too long (handled by black)
-    W503,  # line break before binary operator
+ignore = E203,E501,W503

src/pdf_splitter/detector.py

@@ -2,7 +2,7 @@
 
 import re
 from pathlib import Path
-from typing import Optional
+from typing import Optional, List, Tuple
 import fitz  # PyMuPDF
 
 from pdf_splitter.models import Chapter, DetectionResult
@@ -62,7 +62,7 @@ def detect(
         total_pages = len(doc)
         has_bookmarks = len(doc.get_toc()) > 0
 
-        chapters: list[Chapter] = []
+        chapters: List[Chapter] = []
 
         if strategy == "bookmarks" or (strategy == "hybrid" and has_bookmarks):
             chapters = self._detect_from_bookmarks(doc, bookmark_level)
@@ -109,7 +109,7 @@ def _detect_from_bookmarks(self, doc: fitz.Document, bookmark_level: int = 1) ->
         if not toc:
             return []
 
-        chapters: list[Chapter] = []
+        chapters: List[Chapter] = []
         total_pages = len(doc)
 
         # Filter for specified bookmark level
@@ -146,8 +146,8 @@ def _detect_from_heuristics(self, doc: fitz.Document) -> list[Chapter]:
         Returns:
             List of detected chapters
         """
-        chapters: list[Chapter] = []
-        potential_chapters: list[tuple[int, str, float]] = []
+        chapters: List[Chapter] = []
+        potential_chapters: List[Tuple[int, str, float]] = []
 
         # Analyze each page for chapter headings
         for page_num in range(len(doc)):

src/pdf_splitter/models.py

@@ -1,7 +1,7 @@
 """Models for representing chapters and detection results."""
 
 from dataclasses import dataclass
-from typing import Optional
+from typing import Optional, List
 
 
 @dataclass
@@ -29,7 +29,7 @@ def __str__(self) -> str:
 class DetectionResult:
     """Container for chapter detection results."""
 
-    chapters: list[Chapter]
+    chapters: List[Chapter]
     strategy_used: str
     total_pages: int
     has_bookmarks: bool

src/pdf_splitter/splitter.py

@@ -1,6 +1,7 @@
 """PDF splitting functionality."""
 
 from pathlib import Path
+from typing import List
 import fitz  # PyMuPDF
 
 from pdf_splitter.models import Chapter
@@ -27,11 +28,11 @@ def __init__(self, output_dir: Path, filename_pattern: str = "{index:02d}_{title
         self.output_dir.mkdir(parents=True, exist_ok=True)
 
     def split(
-        self, 
-        pdf_path: Path, 
-        chapters: list[Chapter],
+        self,
+        pdf_path: Path,
+        chapters: List[Chapter],
         preserve_metadata: bool = True
-    ) -> list[Path]:
+    ) -> List[Path]:
         """
         Split a PDF file into separate files by chapters.
         
@@ -44,7 +45,7 @@ def split(
             List of paths to the created PDF files
         """
         doc = fitz.open(pdf_path)
-        created_files: list[Path] = []
+        created_files: List[Path] = []
 
         # Get original metadata
         metadata = doc.metadata if preserve_metadata else {}