If I want to make some changes in default code, is it possible ?

[Abhishek-ya]

If yes, then how can I do that?
I want to make the y-axis in the phase section plot between the range of (-180, 180) with the spacing of 30.
I changed the major_locator(MultipleLocator) from 15 to 30 and saved that file.
But after running the program I did not get the outcome according to the changes.