How to transform list format of python to 2D presentation format and will be "tab" between the column as a text film in linux?

Question

[Grace_G]

I use Linux, in one path, there is a file named annotation_x.txt

less annotation_x.txt
transcript:ENST00000437963  gene:ENSG00000187634
transcript:ENST00000624431  gene:ENSG00000239906
transcript:ENST00000335137  gene:ENSG00000186092

other python script annotation_x_mod.py to read it in

# coding=UTF-8
annotation_x = [line.split('\t') for line in open('annotation_x.txt')]  

python annotation_x_mod.py
[['transcript:ENST00000437963', 'gene:ENSG00000187634\n'], ['transcript:ENST00000624431', 'gene:ENSG00000239906\n'], ['transcript:ENST00000335137','gene:ENSG00000186092\n']]

How to reverse the process after some modification?

Like this simple example，it will become as:

[['transcript:ENST00000437963', '1', 'ENSG00000187634\n'], ['transcript:ENST00000624431', '12', 'ENSG00000239906\n'], ['transcript:ENST00000335137', '23', 'ENSG00000186092\n']]

then, how to return to linux and just shows by rows and cols?

transcript:ENST00000437963  1   ENSG00000187634
transcript:ENST00000624431  12  ENSG00000239906     
transcript:ENST00000335137  23  ENSG00000186092

[cschu181]

for line in annotation_x:
    print(*line, sep="\t") # python3 or with from __future__ import print_function
    print "\t".join(line) # python2

What you also should do in your code is:

annotation_x = [line.strip().split('\t') for line in open('annotation_x.txt')] # use .strip() to get rid off the line endings

[Grace_G]

Exactly right! Many thanks!

[Andrzej Zielezinski]

Where did you get these 1, 12, 23 numbers from?

[Grace_G]

Your consideration is very reasonable. But here I just want to shows maybe will add one col or n cols. Actually for my data process I guess I will add some cols so gave example like 1, 12, 23.