This post explains how to use lists in Python. Learn how to add to a list in Python, create lists, insert entries, and more.

Many programs have a need to iterate over a large list of generated data. The conventional way to do this would be to calculate the values for the list and populate it, then loop over the whole thing.

"File_in" is an empty list that can store the contents of each file on each iteration.>>>file_in = list () Use a "for" loop to cycle through each file name in the file name list.