additional mypy checks

probables/utilities.py

@@ -4,8 +4,9 @@
 import mmap
 import string
 from array import array
+from io import BufferedReader
 from pathlib import Path
-from typing import Union
+from typing import List, Optional, Union
 
 
 def is_hex_string(hex_string: Union[str, None]) -> bool:
@@ -53,8 +54,6 @@ def __exit__(self, *args, **kwargs) -> None:
             self.map.close()
         if self.__f:
             self.__f.close()
-        self.__f = None
-        self.__m = None
         self._closed = True
 
     @property
@@ -120,7 +119,7 @@ def bitarray(self) -> array:
         """The bitarray"""
         return self._bitarray
 
-    def __getitem__(self, key: Union[int, slice]) -> int:
+    def __getitem__(self, key: Union[int, slice]) -> Union[int, List[int]]:
         if isinstance(key, slice):
             indices = range(*key.indices(self._size))
             return [self.check_bit(i) for i in indices]

pyproject.toml

@@ -44,16 +44,6 @@ Homepage = "https://github.com/barrust/pyprobables"
 Bug-tracker = "https://github.com/barrust/pyprobables/issues"
 Documentation = "https://pyprobables.readthedocs.io/"
 
-[tool.poetry]
-packages = [{ include = "probables" }]
-
-[tool.poetry.dev-dependencies]
-pre-commit = { version = ">=2.18.1", python = "^3.6.1" }
-black = { version = "^20.8b1", python = "^3.6" }
-isort = { version = "^5.6.4", python = "^3.6" }
-pytest = { version = "^6.1.1", python = "^3.6" }
-flake8 = { version = "^3.6.0", python = "^3.6" }
-
 [tool.setuptools.packages.find]
 include = ["probables", "probables.*"]