old_contents: import os
  
  # *****************************
  # Environment specific settings
  # *****************************
  
  # The settings below can (and should) be over-ruled by OS environment variable settings
  
  # Flask settings                     # Generated with: import os; os.urandom(24)
  SECRET_KEY = '\xb9\x8d\xb5\xc2\xc4Q\xe7\x8ej\xe0\x05\xf3\xa3kp\x99l\xe7\xf2i\x00\xb1-\xcd'
  # PLEASE USE A DIFFERENT KEY FOR PRODUCTION ENVIRONMENTS!
  
  # SQLAlchemy settings
  SQLALCHEMY_DATABASE_URI = 'sqlite:///../app.sqlite'
  
  # Flask-Mail settings
  MAIL_USERNAME = 'email@example.com'
  MAIL_PASSWORD = 'password'
  MAIL_DEFAULT_SENDER = '"AppName" <noreply@example.com>'
  MAIL_SERVER = 'MAIL_SERVER', 'smtp.gmail.com'
  MAIL_PORT = 465
  MAIL_USE_SSL = True
  MAIL_USE_TLS = False
  
  ADMINS = [
      '"Admin One" <admin1@gmail.com>',
      ]
  
new_contents: import os
  
  # *****************************
  # Environment specific settings
  # *****************************
  
  # The settings below can (and should) be over-ruled by OS environment variable settings
  
  # Flask settings                     # Generated with: import os; os.urandom(24)
  SECRET_KEY = '\x9d|*\xbb\x82T\x83\xeb\xf52\xd1\xdfl\x87\xb4\x9e\x10f\xdf\x9e\xea\xf8_\x99'
  # PLEASE USE A DIFFERENT KEY FOR PRODUCTION ENVIRONMENTS!
  
  # SQLAlchemy settings
  SQLALCHEMY_DATABASE_URI = 'sqlite:///../app.sqlite'
  
  # Flask-Mail settings
  MAIL_USERNAME = ''
  MAIL_PASSWORD = ''
  MAIL_DEFAULT_SENDER = ''
  MAIL_SERVER = 'localhost'
  MAIL_PORT = 25
  MAIL_USE_SSL = False
  MAIL_USE_TLS = False
  
  ADMINS = [
      '"Admin One" <admin1@gmail.com>',
      ]
  
subject: Set environment settings to suit localhost