Write a list to columns

Question

I have a Python list of data:

[1,2,3,4,5]

I want to read this data into a file as a column in the following way:

and then I want my next list ([6,7,8,9,10]) to be added to it (with a tab):

and so on.

Could anyone help me with how I can do this please?

Asked By: user1551817

||

Source

Answer 1

Use the built-in function zip():

with open('data.txt', 'w') as f:
    lst = [[1, 2, 3, 4, 5], [6, 7, 8, 9, 10], [11, 12, 13, 14, 15]]
    for x in zip(*lst):
        f.write("{0}t{1}t{2}n".format(*x))

output:

Answered By: Ashwini Chaudhary

Answer 2

If you have a list of all these lists, like

data = [[1, 2, 3, 4, 5], [6, 7, 8, 9, 10]]

you can transpose it with zip(*data) to get

[[1, 6], [2, 7], [3, 8], [4, 9], [5, 10]]

and then write these out with something like

with open('filename', 'w') as f:
    for row in zip(*data):
        f.write('t'.join(row)+'n')

Answered By: Abe Karplus

Answer 3

col1,col2 = [1,2,3,4,5],[6,7,8,9,10]

>>> output = 'n'.join('t'.join(map(str,row)) for row in zip(col1,col2))
>>> print(output)
1       6
2       7
3       8
4       9
5       10

To write to a file:

with open('output.txt', 'w') as f:
    f.write(output)

Answered By: ninjagecko

Answer 4

>>> from itertools import izip
>>> with open('in.txt') as f:
...    input = [s.strip() for s in f.readlines()]
...
>>> input
['1', '2', '3', '4', '5']
>>> combine = ['6','7','8','9','10']
>>> with open('out.txt','w') as f:
...     for x in izip(input,combine):
...         f.write("{0}t{1}n".format(x[0],x[1]))
...
>>> quit()
burhan@sandbox:~$ cat out.txt
1       6
2       7
3       8
4       9
5       10

Answered By: Burhan Khalid

Write a list to columns

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