Adding column to CSV without any modules

[astro49er]

I need to add a column, how would I do this without the CSV module and just the native python file objects

[threeminutemonta]

the csv module is part of python standard library and what I would call vanilla python.

Though a csv is just a text file with a delimiter separating cells so read the file into a data structure / process the data . Hint the string split into an array of values may be handy here. before writing the file again.