Use Optional and Union for python 3.9 compatibility

pdfalyzer/helpers/filesystem_helper.py

@@ -3,7 +3,7 @@
 """
 import re
 from pathlib import Path
-from typing import Union
+from typing import Optional, Union
 
 from yaralyzer.output.rich_console import console
 
@@ -45,7 +45,7 @@ def do_all_files_exist(file_paths: list[Union[str, Path]]) -> bool:
     return all_files_exist
 
 
-def extract_page_number(file_path: Union[str, Path]) -> int|None:
+def extract_page_number(file_path: Union[str, Path]) -> Optional[int]:
     """Extract the page number from the end of a filename if it exists."""
     match = NUMBERED_PAGE_REGEX.match(str(file_path))
     return int(match.group(1)) if match else None
@@ -56,7 +56,7 @@ def file_size_in_mb(file_path: Union[str, Path], decimal_places: int = 2) -> flo
     return round(Path(file_path).stat().st_size / 1024.0 / 1024.0, decimal_places)
 
 
-def set_max_open_files(num_filehandles: int = DEFAULT_MAX_OPEN_FILES) -> tuple[int | None, int | None]:
+def set_max_open_files(num_filehandles: int = DEFAULT_MAX_OPEN_FILES) -> tuple[Optional[int], Optional[int]]:
     """
     Sets the OS level max open files to at least 'num_filehandles'. Current value can be seen with 'ulimit -a'.
     Required when you might be opening more than DEFAULT_MAX_OPEN_FILES file handles simultaneously

pdfalyzer/helpers/rich_text_helper.py

@@ -1,8 +1,7 @@
 """
 Functions for miscellaneous Rich text/string operations.
 """
-from functools import partial
-from typing import List
+from typing import List, Union
 
 from pypdf.generic import PdfObject
 from rich.console import Console
@@ -17,7 +16,7 @@
 pdfalyzer_console = Console(color_system='256')
 
 
-def print_highlighted(msg: str|Text, **kwargs) -> None:
+def print_highlighted(msg: Union[str, Text], **kwargs) -> None:
     """Print 'msg' with Rich highlighting."""
     pdfalyzer_console.print(msg, highlight=True, **kwargs)
 

pdfalyzer/util/argument_parser.py

@@ -4,7 +4,7 @@
 from functools import partial, update_wrapper
 from importlib.metadata import version
 from os import getcwd, path
-from typing import List
+from typing import List, Optional
 
 from rich_argparse_plus import RichHelpFormatterPlus
 from rich.prompt import Confirm
@@ -254,7 +254,7 @@ def ask_to_proceed() -> None:
         exit_with_error()
 
 
-def exit_with_error(error_message: str|None = None) -> None:
+def exit_with_error(error_message: Optional[str] = None) -> None:
     """Print 'error_message' and exit with status code 1."""
     if error_message:
         print_highlighted(Text('').append('ERROR', style='bold red').append(f': {error_message}'))