Fixes from ci (#533)

* break line

* remove unused imports

* remove unused os import

* make flake8 more strict

* configure flake for black

* fix action

* use importlib_resources

* rename deprecated methods

src/escpos/capabilities.py

@@ -1,13 +1,15 @@
 import re
 from os import environ, path
-import pkg_resources
+import atexit
 import pickle
 import logging
 import time
+import importlib_resources
 
 import six
 import yaml
 
+from contextlib import ExitStack
 from tempfile import mkdtemp
 import platform
 
@@ -20,10 +22,13 @@ pickle_dir = environ.get("ESCPOS_CAPABILITIES_PICKLE_DIR", mkdtemp())
 pickle_path = path.join(
     pickle_dir, "{v}.capabilities.pickle".format(v=platform.python_version())
 )
-# get a temporary file from pkg_resources if no file is specified in env
+# get a temporary file from importlib_resources if no file is specified in env
+file_manager = ExitStack()
+atexit.register(file_manager.close)
+ref = importlib_resources.files(__name__) / "capabilities.json"
 capabilities_path = environ.get(
     "ESCPOS_CAPABILITIES_FILE",
-    pkg_resources.resource_filename(__name__, "capabilities.json"),
+    file_manager.enter_context(importlib_resources.as_file(ref)),
 )
 
 # Load external printer database

src/escpos/escpos.py

@@ -20,8 +20,6 @@ from re import match as re_match
 import barcode
 from barcode.writer import ImageWriter
 
-import os
-
 from .constants import (
     ESC,
     GS,
@@ -84,7 +82,7 @@ from .magicencode import MagicEncode
 
 from abc import ABCMeta, abstractmethod  # abstract base class support
 from escpos.image import EscposImage
-from escpos.capabilities import get_profile, BARCODE_B
+from escpos.capabilities import get_profile
 
 
 # Remove special characters and whitespaces of the supported barcode names,
@@ -510,7 +508,8 @@ class Escpos(object):
         .. note::
             Get all supported formats at:
               - Hardware: :py:const:`~escpos.constants.BARCODE_FORMATS`
-              - Software: `Python barcode documentation <https://python-barcode.readthedocs.io/en/stable/supported-formats.html>`_
+              - Software:
+                `Python barcode documentation <https://python-barcode.readthedocs.io/en/stable/supported-formats.html>`_
         """
         hw_modes = ["barcodeA", "barcodeB"]
         sw_modes = ["graphics", "bitImageColumn", "bitImageRaster"]