PYTHON HELP
 Dear Computer Scientists and Programmers,
                Let's say there is a directory with several files. I create a list of file name. Now I need to open each file in different condition(or time). In other word I really don't know the file name or it can be changed  any time so how can I code to open the file(s) which is inside the directory?
here is what I did.

import os
L = os.listdir("data")   #data is a folder  <------------- this is fine

file_object = open("data\L[0]","r") <----------- here is the problem



Thank you for your time and consideration.