Creating file in app engine project : I want to create json file for each user with user id. for example 123456.json in data folder. When i try this without flask server just in simple test file it works:

    with open('data/3456789.json', "w+") as f:
		print("test")

but when i call it in flask server created in app engine i am getting error ```No such file or directory: 'data/3456789.json'```
thats how my ```main.py``` looks like:

    import os, sys
    from flask import Flask
    app = Flask(__name__)

    @app.route('/webhook', methods=['GET'])
    def createFile():
      with open('data/3456789.json', "w+") as f:
		print("test")
    return "Welcome"

    if __name__ == '__main__':
	  port = int(os.getenv('PORT', 5000))
	  print("Starting app on port %d" % port)
	  app.run(debug=False, port=port, host='0.0.0.0')
```main.py``` wokrs perfect in my own pc. without any error. Any idea?