Maybe I don't understand dataframes and pandas.   So here is my current situation based on my current understanding :   I have a JSON file which was loaded into the Dataframe in memory.  I have made some changes to the data using Pandas to sort and filter and remove some data.  Now my understanding is I need to save the updated dataframe from memory back to a JSON file or replace the JSON file I started with at the beginning of the session.  I am thinking of it like I need to issue a "Save" or "Save As"  command like I would do in an application such as Excel because if I do not then I will loose my changes to the data.  Please help.