diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..39181eb
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,19 @@
+; https://EditorConfig.org
+root = true
+
+[*.{py, css, scss, sass, less, js, ts, html, xhtml, json, txt, ini, yml, env, sh, cfg}]
+charset = utf-8
+max_line_length = 140
+
+[*.py]
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[Makefile]
+indent_style = tab
+
+[*.{css, scss, sass, less, js, ts, html, xhtml, json}]
+indent_style = space
+indent_size = 2
\ No newline at end of file
diff --git a/.flake8 b/.flake8
new file mode 100644
index 0000000..bb7675c
--- /dev/null
+++ b/.flake8
@@ -0,0 +1,5 @@
+[flake8]
+max-line-length = 140
+exclude = venv*/*,
+    build/*,
+    dist/*,
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9db2b72..ce32ee2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,7 +8,6 @@
 * Removed macshim.py
 * Removed coldshot support
 
-
 ## Modifications since the Fork
 
 * Python3 compatibility
@@ -19,3 +18,17 @@
 * Replaced SafeConfigParser with ConfigParser
 * Replaced logger.warn with logger.warning
 
+## [2.1.0] - 2023-02-05
+
+* wxPython 4.2.0 compatibility
+* Fixed deprecation warning
+
+## [2.2.0] - 2023-02-07
+
+* Fixed top-level code environment
+* Modernized `setup.py`: updated and fixed installation meta
+* Modernized `version` control: rename `version.py` -> `vertion.txt`
+* Added `requirements.txt`
+* Added `.flake8` and fixed the code
+* Added `.editorconfig`
+* Updated application resource
diff --git a/MANIFEST.in b/MANIFEST.in
index 6cc9c9c..49daaf1 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,6 +1,7 @@
 include MANIFEST.in
-include license.txt
-include readme.txt
+include LICENSE
+include CHANGELOG.md
+include README.md
 include setup.py
 include *.desktop
 include runsnakerun *.png
diff --git a/README.md b/README.md
index 711aa8d..758c0bc 100644
--- a/README.md
+++ b/README.md
@@ -17,8 +17,8 @@ and up to current best practices and standards.
 
 ### Requirements
 
-* Python3
-* wxpython 4
+* Python: 3.7+
+* wxPython: 4.2+
 
 
 ### Modifications since the Fork
@@ -33,6 +33,12 @@ and up to current best practices and standards.
 
 [RunSnakeRun]: http://www.vrplumber.com/programming/runsnakerun/
 
+### Start
+
+```shell
+python -m snakerunner 
+```
+
 ### Screenshot
 
 ![Screenshot of runsnakerun on macOS Mojave with Python 3.7](screenshot.png)
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..af51873
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,2 @@
+setuptools~=65.5.1
+wxPython~=4.2.0
\ No newline at end of file
diff --git a/setup.py b/setup.py
index 16cf194..804ca69 100755
--- a/setup.py
+++ b/setup.py
@@ -1,22 +1,22 @@
 from setuptools import setup, find_packages
+from os.path import abspath, dirname, join
 
-meta = {}
-exec(open('./snakerunner/version.py').read(), meta)
-meta['long_description'] = open('./README.md').read()
+_root = dirname(abspath(__file__))
+_version = open(join(_root, 'snakerunner', 'version.txt'), 'r').read()
+_long_description = open(join(_root, 'README.md'), 'r').read()
+_install_requires = open(join(_root, 'requirements.txt'), 'r').readlines()
 
 setup(
     name='snakerunner',
-    version=meta['__version__'],
+    version=_version,
     author="Bastian Venthur",
     author_email="venthur@debian.org",
     description="GUI Viewer for Python profiling runs",
-    long_description=meta['long_description'],
+    long_description=_long_description,
     keywords='profile,gui,wxPython,squaremap',
     url="https://github.com/venthur/snakerunner",
     packages=find_packages(exclude=['tests', "venv"]),
-    install_requires=[
-        'wxpython',
-    ],
+    install_requires=_install_requires,
     license="BSD",
     zip_safe=False,
     entry_points={
diff --git a/snakerunner/snakerunner.py b/snakerunner/__main__.py
similarity index 98%
rename from snakerunner/snakerunner.py
rename to snakerunner/__main__.py
index 0d0d447..5b051db 100755
--- a/snakerunner/snakerunner.py
+++ b/snakerunner/__main__.py
@@ -300,7 +300,7 @@ def LoadRSRIcon(self):
         try:
             from snakerunner.resources import rsricon_png
             return getIcon(rsricon_png.data)
-        except Exception as err:
+        except Exception:
             return None
 
     sourceCodeControl = None
@@ -488,7 +488,7 @@ def OnBackView(self, event):
         self.historyIndex -= 1
         try:
             self.RestoreHistory(self.history[self.historyIndex])
-        except IndexError as err:
+        except IndexError:
             self.SetStatusText(_('No further history available'))
 
     def OnRootView(self, event):
@@ -514,7 +514,7 @@ def SourceShowFile(self, node):
         if filename and self.sourceFileShown != filename:
             try:
                 data = open(filename).read()
-            except Exception as err:
+            except Exception:
                 # TODO: load from zips/eggs? What about .pyc issues?
                 return None
             else:
@@ -570,7 +570,7 @@ def RecordHistory(self):
             if self.historyIndex < -1:
                 try:
                     del self.history[self.historyIndex+1:]
-                except AttributeError as err:
+                except AttributeError:
                     pass
             if (not self.history) or record != self.history[-1]:
                 self.history.append(record)
@@ -666,10 +666,10 @@ def LoadState(self, config_parser):
             ]
             self.SetPosition((x, y))
             self.SetSize((width, height))
-        except configparser.NoSectionError as err:
+        except configparser.NoSectionError:
             # the file isn't written yet, so don't even warn...
             pass
-        except Exception as err:
+        except Exception:
             # this is just convenience, if it breaks in *any* way, ignore it...
             log.error(
                 "Unable to load window preferences, ignoring: %s", traceback.format_exc()
@@ -698,7 +698,7 @@ def OnCloseWindow(self, event=None):
             temp = config + '~'
             self.config.write(open(temp, 'w'))
             os.rename(temp, config)
-        except Exception as err:
+        except Exception:
             log.error("Unable to write window preferences, ignoring: %s",
                       traceback.format_exc())
         self.Destroy()
@@ -706,7 +706,7 @@ def OnCloseWindow(self, event=None):
 
 class RunSnakeRunApp(wx.App):
     """Basic application for holding the viewing Frame"""
-    #handler = wx.PNGHandler()
+    # handler = wx.PNGHandler()
 
     def OnInit(self):
         """Initialise the application"""
diff --git a/snakerunner/listviews.py b/snakerunner/listviews.py
index c892293..4aebe48 100644
--- a/snakerunner/listviews.py
+++ b/snakerunner/listviews.py
@@ -133,7 +133,7 @@ def OnNodeActivated(self, event):
             node = self.sorted[event.GetIndex()]
         except AttributeError:
             pass
-        except IndexError as err:
+        except IndexError:
             log.warning(_('Invalid index in node activated: %(index)s'),
                         index=event.GetIndex())
         else:
@@ -149,7 +149,7 @@ def OnNodeSelected(self, event):
             node = self.sorted[event.GetIndex()]
         except AttributeError:
             pass
-        except IndexError as err:
+        except IndexError:
             log.warning(_('Invalid index in node selected: %(index)s'),
                         index=event.GetIndex())
         else:
@@ -166,7 +166,7 @@ def OnMouseMove(self, event):
         if item > -1:
             try:
                 node = self.sorted[item]
-            except IndexError as err:
+            except IndexError:
                 log.warning(_('Invalid index in mouse move.'))
             else:
                 wx.PostEvent(
@@ -211,7 +211,7 @@ def OnReorder(self, event):
     def ReorderByColumn(self, column):
         """Reorder the set of records by column"""
         # TODO: store current selection and re-select after sorting...
-        single_column = self.SetNewOrder(column)
+        self.SetNewOrder(column)
         self.reorder(single_column=True)
         self.Refresh()
 
@@ -273,7 +273,7 @@ def OnGetItemText(self, item, col):
         try:
             column = self.columns[col]
             value = column.get(self.sorted[item])
-        except IndexError as err:
+        except IndexError:
             return ''
         else:
             if value is None:
@@ -283,7 +283,7 @@ def OnGetItemText(self, item, col):
             if column.format:
                 try:
                     return column.format % (value,)
-                except Exception as err:
+                except Exception:
                     log.warning('Column %s could not format %r value: %r',
                                 column.name, type(value), value)
                     value = column.get(self.sorted[item])
diff --git a/snakerunner/pstatsloader.py b/snakerunner/pstatsloader.py
index e454091..5526ba4 100644
--- a/snakerunner/pstatsloader.py
+++ b/snakerunner/pstatsloader.py
@@ -19,7 +19,7 @@ def __init__(self, *filenames):
         self.location_rows = {}
         self.stats = pstats.Stats(*filenames)
         self.tree = self.load(self.stats.stats)
-        self.location_tree = l = self.load_location()
+        self.location_tree = self.load_location()
 
     ROOTS = ['functions', 'location']
 
@@ -54,7 +54,7 @@ def load(self, stats):
         for func, raw in stats.items():
             try:
                 rows[func] = row = PStatRow(func, raw)
-            except ValueError as err:
+            except ValueError:
                 log.info('Null row: %s', func)
         for row in rows.values():
             row.weave(rows)
@@ -177,7 +177,7 @@ def __init__(self, key, raw):
         file, line, func = self.key = key
         try:
             dirname, basename = os.path.dirname(file), os.path.basename(file)
-        except ValueError as err:
+        except ValueError:
             dirname = ''
             basename = file
         nc, cc, tt, ct, callers = raw
@@ -220,7 +220,7 @@ def child_cumulative_time(self, child):
         if total:
             try:
                 (cc, nc, tt, ct) = child.callers[self.key]
-            except TypeError as err:
+            except TypeError:
                 ct = child.callers[self.key]
             return float(ct)/total
         return 0
diff --git a/snakerunner/resources/__init__.py b/snakerunner/resources/__init__.py
index 72b86cb..7b71b9d 100644
--- a/snakerunner/resources/__init__.py
+++ b/snakerunner/resources/__init__.py
@@ -17,8 +17,8 @@
 
             # CUSTOMISATION POINT
             # import specialised generators here, such as for wxPython
-            #from resourcepackage import wxgenerators
-            #generators.update( wxgenerators.generators )
+            # from resourcepackage import wxgenerators
+            # generators.update( wxgenerators.generators )
         except ImportError:
             pass
         else:
diff --git a/snakerunner/resources/rsricon_png.py b/snakerunner/resources/rsricon_png.py
index 740fd72..bcf85cc 100644
--- a/snakerunner/resources/rsricon_png.py
+++ b/snakerunner/resources/rsricon_png.py
@@ -1,31 +1,7 @@
 # -*- coding: ISO-8859-1 -*-
 """Resource rsricon_png (from file rsricon.png)"""
 # written by resourcepackage: (1, 0, 1)
+# flake8: noqa
 source = 'rsricon.png'
 package = 'runsnakerun.resources'
-data = "�PNG\015\012\032\012\000\000\000\015IHDR\000\000\000 \000\000\000 \010\006\000\000\000szz�\000\000\000\004sBIT\010\010\010\010|\010d�\000\000\000\011pHYs\000\000\015\
-�\000\000\015�\001B(�x\000\000\000\031tEXtSoftware\000www.inkscape.org��<\032\000\000\005NIDATX���m\
-lSU\030�����;��e\033[��p\033\014�Xx\021\007\010\010d\012Q\003:#/J�BH4���|1~\000_\023��/hLHԠ\031D\
-?\020\015\001\004�\011\014��\004�\030��\006s�ۺ��[o���^Y[��/=}���_{�s�\025RJ��\020¥�(5��\005\
-\\�\031\012p8\024�w)��\010A\034!�\002��)�KJx��a6f\025�V6`�T�2���p�i��=\034\014z�\"��;�\000۶\
-���r�\001E3g�N�l������*��\007�\012v0_Ji�\013��\017��ؚ�4h\0160�\015/-�W�>\035-\031�\
-��\035�\017\000\010!Դ46�l�\005+J�1,�SBb���m��7&\000eeL��qe\007�N����CnZ�p�:2\014'{\
-�\004`�B&��=�5kJ��ȏ(\032�\024)�\022@O�%���\015�����XTW;�v�\031Q�*\021)\000�Y\030���\0004C\
-<����j�^�Y�޷���оw�b�x4.\000��/\01363w�� ���L��(j��~��A����ÍM\
-Ofi\\\000\031E�쉀\006\033�:ʺu��\024��\010͡�q�\013�C�BA��x�\002�L��/U\035^j\033\006'��Pq\022���\
-\006h<\007�18�m\"\020��w<\000�k�\012�\"UQ�g����z.8\022�P\025�t�\026�n��٠�}°����̭\\�\
-\024\017��'�ʑɞy��&bt{O��\027\025Kh����#\036ŠdUe\036�����A��T\031�F\033)��\022�!ʝ��*\
-.#�>lϛA�9��si��6;Ȼ�\"ﶓ�b1���ٺ���\036�|\000\000���R=�O\035�d;&bh\006:\002](\
-(��@�\015\025\011\026\034���SY��\010�Z0&\000\003\011!�\0009�·/ng�W'��\\�\023O�I��\011\027\016�R�cE�}5�\
-˾\031-@�å�ץ�Ǧ�!�pzts��\033�;\011��>{�IErSJ�Ք����\006\000\020Bh�\013p٣܎�\0216�\
-J)�\000R�{{eʛc\002\000d�s�5�>JI�8ɣ\034������\002IJ�\007��\011\032\010 b�I�\026\003�IǗ-3��\
-�5���@g�\007SW�aDN�M@�\030�\021\001H)ͺj�\000\023��\016\001B\001$\031\017z�\020�.��\0345\000��:�L\013ң�\
-�(6H�']3��1���K\021{��Ԥ�sn\\�8\"����1�,�e_c\023��&�(\002�a�0�\031��=��'��\
-z��\001\004�q�i\006��g21�\0112��}?�\014���|\004l���u�\013!�'�и�5R���zKd����Ez��h\
-7�X�b&L(@����Ʃoi�62CJ�\033���\004R���\023\034���0\003��\011B���؋_ c��df\026G7\007�\
-]L�������\000\000�\026���;Z4\025\026M\001�>\007S����r\005y�\025�Eh6�M\003�B����ޘK�\037�C����\
-�6lb�߄s��\031|�����t՝����gEau���\011t\020�q�ʐ��6�O\024\033�\017\004�-t�s��\035��\
-&�Զ•f0Ñ�\035\015X�\017p�����>>�RZB���4.-�B��\031�n`6]�����\021\001�A\030z2�fNf\
-������co�\013-]�o��;X���\012�s$��{R�֡z-A��I���h�\000��\0166Yayv�\000C@4`��\
-`���D(����n\037��\020\007�����\012@��\000�\007�\022��o�~�\000\000\000\000IEND�B`�"
-# end
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diff --git a/snakerunner/squaremap.py b/snakerunner/squaremap.py
index 0625d92..518cd18 100755
--- a/snakerunner/squaremap.py
+++ b/snakerunner/squaremap.py
@@ -9,7 +9,6 @@
 import wx.lib.newevent
 
 log = logging.getLogger('squaremap')
-#log.setLevel( logging.DEBUG )
 
 SquareHighlightEvent, EVT_SQUARE_HIGHLIGHTED = wx.lib.newevent.NewEvent()
 SquareSelectionEvent, EVT_SQUARE_SELECTED = wx.lib.newevent.NewEvent()
@@ -225,7 +224,7 @@ def SetModel(self, model, adapter=None):
         self.UpdateDrawing()
 
     def OnPaint(self, event):
-        dc = wx.BufferedPaintDC(self, self._buffer)
+        wx.BufferedPaintDC(self, self._buffer)
 
     def OnSize(self, event):
         # The buffer is initialized in here, so that the buffer is always
@@ -415,9 +414,7 @@ def LayoutChildren(self, dc, children, parent, x, y, w, h, hot_map, depth=0, nod
                     return
 
             (firstSize, firstNode) = nodes[-1]
-            fraction = firstSize/float(total)
-            head_coord, tail_coord = split_box(
-                firstSize/float(total), x, y, w, h)
+            head_coord, tail_coord = split_box(firstSize/float(total), x, y, w, h)
             if head_coord:
                 self.DrawBox(
                     dc, firstNode, head_coord[0], head_coord[1], head_coord[2], head_coord[3],
@@ -461,7 +458,7 @@ def split_box(fraction, x, y, w, h):
 
 def split_by_value(total, nodes, headdivisor=2.0):
     """Produce, (sum,head),(sum,tail) for nodes to attempt binary partition"""
-    head_sum, tail_sum = 0, 0
+    head_sum = 0
     divider = 0
     for node in nodes[::-1]:
         if head_sum < total/headdivisor:
diff --git a/snakerunner/version.py b/snakerunner/version.py
deleted file mode 100644
index a33997d..0000000
--- a/snakerunner/version.py
+++ /dev/null
@@ -1 +0,0 @@
-__version__ = '2.1.0'
diff --git a/snakerunner/version.txt b/snakerunner/version.txt
new file mode 100644
index 0000000..e3a4f19
--- /dev/null
+++ b/snakerunner/version.txt
@@ -0,0 +1 @@
+2.2.0
\ No newline at end of file