old_contents: #!/usr/bin/python
  
  from flask import Flask
  
  app = Flask(__name__)
  
  @app.route("/")
  def hello():
  	return "hello, world 2!"
  
  if __name__ == "__main__":
  	app.run(debug = True)
  
new_contents: #!.pyenv/bin/python
  
  from flask import Flask
  
  app = Flask(__name__)
  
  @app.route("/")
  def hello():
  	return "hello, world 2!"
  
  if __name__ == "__main__":
  	app.run(debug = True)
  
subject: fix path