Added pycodestyle entry_point

Converted pep8 entry point to emit a deprecation warning for users

Author: IanLee1521

pep8.py

@@ -2181,5 +2181,20 @@ def _main():
             sys.stderr.write(str(report.total_errors) + '\n')
         sys.exit(1)
 
+
+def _main_pep8():
+    """Entrypoint for pep8 commandline tool.
+
+    Warn of deprecation and advise users to switch to pycodestyle.
+    """
+    print(
+        'Deprecation Warning:\n'
+        'pep8 has been renamed to pycodestyle and the use of the pep8 '
+        'executable will be removed in a future release. Please use '
+        '`pycodestyle` instead.\n'
+    )
+    _main()
+
+
 if __name__ == '__main__':
     _main()

setup.py

@@ -38,7 +38,8 @@ def get_long_description():
     ],
     entry_points={
         'console_scripts': [
-            'pep8 = pep8:_main',
+            'pycodestyle = pep8:_main',
+            'pep8 = pep8:_main_pep8',
         ],
     },
     classifiers=[