--- a/eric6/Plugins/CheckerPlugins/CodeStyleChecker/CodeStyleCheckerDialog.py Mon Jun 22 17:55:06 2020 +0200 +++ b/eric6/Plugins/CheckerPlugins/CodeStyleChecker/CodeStyleCheckerDialog.py Tue Jun 23 17:24:18 2020 +0200 @@ -613,8 +613,7 @@ self.files = fn[:] elif os.path.isdir(fn): self.files = [] - extensions = set(Preferences.getPython("PythonExtensions") + - Preferences.getPython("Python3Extensions")) + extensions = set(Preferences.getPython("Python3Extensions")) for ext in extensions: self.files.extend(Utilities.direntries( fn, True, '*{0}'.format(ext), 0))