old_contents: # -*- coding: utf-8 -*-
  """
  Flask app initialization.
  """
  import os.path
  from flask import Flask
  
  
  MAIN_DATA_CSV = os.path.join(
      os.path.dirname(__file__), '..', '..', 'runtime', 'data', 'sample_data.csv'
  )
  
  
  app = Flask(__name__)  # pylint: disable=invalid-name
  app.config.update(
      DEBUG=True,
      DATA_CSV=MAIN_DATA_CSV
  )
  
new_contents: # -*- coding: utf-8 -*-
  """
  Flask app initialization.
  """
  import os.path
  from flask import Flask
  
  
  MAIN_DATA_CSV = os.path.join(
      os.path.dirname(__file__), '..', '..', 'runtime', 'data', 'sample_data.csv'
  )
  
  
  app = Flask(__name__)  # pylint: disable=invalid-name
  app.config.update(
      DEBUG = True,
      DATA_CSV = MAIN_DATA_CSV
  )
  
subject: Revert "Bug 5278 - [Wdro#enie] [Python] Dostosowanie aplikacji do pep8"