def test_pythontask_property_custom():
task = PythonTask()
assert not hasattr(task, 'custom_field')
task.custom_field = 1.0
assert hasattr(task, 'custom_field')
assert task.custom_field == 1.0
task.custom_field = 2.0
assert task.custom_field == 2.0
del task.custom_field
assert not hasattr(task, 'custom_field')
