How to make assertion in pyswip written to .pl file

[pradip pramanick]

I have a pre-populated '.pl' file that contains facts and rules. I open the file using pyswip's consult() method. For example, there are two facts about an object's pickability:

pickable_object(pen).
pickable_object(paper).

Now after I add a new fact using pyswip:

prolog.assertz('pickable_object(light)')

The query

for result in prolog.query('pickable_object(X)'):
    print(result)

works perfectly and it prints:

{'X': 'pen'} {'X': 'paper'} {'X': 'light'}

But, the assertion does not get written to the '.pl' file. How do I enable this?

As a workaround, I am simply appending the new clause string as a new line, treating as a text file. Is this fine?