I have a question on how to add entries from 100 files (each file contains two columns) and then writing them to a new file(which will also contain two columns)?

This is very underspecified. It's not clear what your problem is.

Probabably you'd do something like:

entries = []
for f in ["file1.txt", "file2.txt", ..., "file100.txt"]:entries.append(open(f).readlines())
o = open("output.txt", "w")
o.writelines(entries)
o.close()