Probable race condition on file_to_check.py

[OrkoHunter]

See the log message (related issue #139).

05 Jul 2019 21:33:53.738187 <190>1 2019-07-05T16:03:53.618619+00:00 app web.1 - - DEBUG:urllib3.connectionpool:Starting new HTTPS connection (1): raw.githubusercontent.com:443
05 Jul 2019 21:33:54.180176 <190>1 2019-07-05T16:03:51.535928+00:00 app web.1 - - DEBUG:urllib3.connectionpool:Starting new HTTPS connection (1): api.github.com:443
05 Jul 2019 21:33:54.180187 <190>1 2019-07-05T16:03:51.587207+00:00 app web.1 - - DEBUG:urllib3.connectionpool:Starting new HTTPS connection (1): raw.githubusercontent.com:443
05 Jul 2019 21:33:54.180208 <190>1 2019-07-05T16:03:51.641273+00:00 app web.1 - - DEBUG:urllib3.connectionpool:https://api.github.com:443 "GET /repos/asrmarco13/Pycolee/pulls/1 HTTP/1.1" 200 13581
05 Jul 2019 21:33:54.180187 <190>1 2019-07-05T16:03:51.658728+00:00 app web.1 - - DEBUG:urllib3.connectionpool:Starting new HTTPS connection (1): raw.githubusercontent.com:443
05 Jul 2019 21:33:54.180298 <190>1 2019-07-05T16:03:51.725768+00:00 app web.1 - - DEBUG:urllib3.connectionpool:https://raw.githubusercontent.com:443 "GET /chembl/GLaDOS/64181f53392a8e40e92703b7a68062ab819662a5//src/glados/es/ws2es/mappings/es_chembl_go_slim_mapping.py HTTP/1.1" 200 855
05 Jul 2019 21:33:54.464265 <190>1 2019-07-05T16:03:51.825464+00:00 app web.1 - - DEBUG:urllib3.connectionpool:https://raw.githubusercontent.com:443 "GET /asrmarco13/Pycolee/9fe105cae2ae5d2796a1206f5c82b0a192045090//exercises/conto1.py HTTP/1.1" 200 516
05 Jul 2019 21:33:54.464187 <190>1 2019-07-05T16:03:51.880886+00:00 app web.1 - - DEBUG:urllib3.connectionpool:Starting new HTTPS connection (1): raw.githubusercontent.com:443
05 Jul 2019 21:33:54.464131 <190>1 2019-07-05T16:03:51.969657+00:00 app web.1 - - ERROR:flask.app:Exception on / [POST]
05 Jul 2019 21:33:54.464128 <190>1 2019-07-05T16:03:51.969661+00:00 app web.1 - - Traceback (most recent call last):
  File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 2292, in wsgi_app
    response = self.full_dispatch_request()
  File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 1815, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 1718, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/app/.heroku/python/lib/python3.7/site-packages/flask/_compat.py", line 35, in reraise
    raise value
  File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 1813, in full_dispatch_request
    rv = self.dispatch_request()
  File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 1799, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/app/server.py", line 38, in main
    return event_to_action[event](request)
  File "/app/pep8speaks/handlers.py", line 35, in handle_pull_request
    helpers.run_pycodestyle(ghrequest, config)
  File "/app/pep8speaks/helpers.py", line 261, in run_pycodestyle
    os.remove("file_to_check.py")
FileNotFoundError: [Errno 2] No such file or directory: 'file_to_check.py'Exception
05 Jul 2019 21:33:54.505297 <158>1 2019-07-05T16:03:51.972094+00:00 heroku router - - at=info method=POST path="/" host=pep8speaks.herokuapp.com request_id=33e3eb24-f68f-4dea-98c2-99f953eac97d fwd="140.82.115.9" dyno=web.1 connect=0ms service=1368ms status=500 bytes=456 protocol=https
05 Jul 2019 21:33:54.536301 <190>1 2019-07-05T16:03:52.041137+00:00 app web.1 - - DEBUG:urllib3.connectionpool:https://raw.githubusercontent.com:443 "GET /chembl/GLaDOS/64181f53392a8e40e92703b7a68062ab819662a5//src/glados/es/ws2es/mappings/es_chembl_mechanism_mapping.py HTTP/1.1" 200 1483
05 Jul 2019 21:33:54.650308 <190>1 2019-07-05T16:03:54.358548+00:00 app web.1 - - DEBUG:urllib3.connectionpool:https://raw.githubusercontent.com:443 "GET /chembl/GLaDOS/64181f53392a8e40e92703b7a68062ab819662a5//src/glados/es/ws2es/mappings/es_chembl_target_component_mapping.py HTTP/1.1" 200 5506
05 Jul 2019 21:33:54.650126 <190>1 2019-07-05T16:03:54.414186+00:00 app web.1 - - DEBUG:flask.app:Request Headers:
05 Jul 2019 21:33:54.650125 <190>1 2019-07-05T16:03:54.414191+00:00 app web.1 - - Host: pep8speaks.herokuapp.com
05 Jul 2019 21:33:54.650112 <190>1 2019-07-05T16:03:54.414193+00:00 app web.1 - - Connection: close
05 Jul 2019 21:33:54.650106 <190>1 2019-07-05T16:03:54.414196+00:00 app web.1 - - Accept: */*

A good way to avoid this is to create file_to_check_.py for each process and so, this exception would not occur again.