How to return False when file exists with FIleSensor

Question

I'm trying to reverse FileSensor(): that is, with

sensor=FileSensor(filepath='test.txt', task_id='dummy_file_test')

It will return True if the file exists. But, how can it return False when the file exists and True when it does not?

Answer 1

You could create a PythonSensor that checks for the existence of a file with the logic that you want.

def my_sensor_func(some_path):
    return not os.exists(some_path)

Answer 2

You can achieve it by creating your own function:

SF = lambda **kwargs: not FileSensor(**kwargs)
sensor=SF(filepath='test.txt', task_id='dummy_file_test')