How could i print lists in python one after another

Question

Assume there're three lists:

list1 = [a1, a2, a3]
list2 = [b1, b2, b3]
list3 = [c1, c2, c3]

how could I print lists one after another to get following result:

a1, b1, c1
a2, b2, c2
a3, b3, c3

related: [Matrix Transpose in Python](http://stackoverflow.com/q/4937491/4279) — jfs, Oct 14 '14 at 18:42
@J.F.Sebastian over-killing for this purpose, I don't want to create extra space. — os1, Oct 14 '14 at 18:45
@os1 If you're so much worried about space then there's [`itertools.izip`](https://docs.python.org/2/library/itertools.html#itertools.izip) as well that returns iterator. — Ashwini Chaudhary, Oct 14 '14 at 18:48
@AshwiniChaudhary Why shouldn't I worry about space, above is a toy example with list of limited length. — os1, Oct 14 '14 at 18:51
@AshwiniChaudhary Even zip returns iterator. yes, space is not a concern here. — os1, Oct 14 '14 at 19:05

score 4 · Answer 1 · answered Oct 14 '14 at 18:41

You could use zip to combine the lists element-wise, then join to create a string delimited by commas from each row.

list1 = ['a1', 'a2', 'a3']
list2 = ['b1', 'b2', 'b3']
list3 = ['c1', 'c2', 'c3']

for row in zip(list1, list2, list3):
    print(', '.join(row))

Output

a1, b1, c1
a2, b2, c2
a3, b3, c3

score 1 · Accepted Answer · edited May 23 '17 at 11:49

1

list1 = ['a1', 'a2', 'a3']
list2 = ['b1', 'b2', 'b3']
list3 = ['c1', 'c2', 'c3']

for row in zip(list1, list2, list3):
    print(", ".join(row))

a1, b1, c1
a2, b2, c2
a3, b3, c3

zip() returns an iterator in Python 3. You could use itertools.izip() on Python 2 as @Ashwini Chaudhary suggested.

edited May 23 '17 at 11:49

Community

answered Oct 14 '14 at 18:44

jfs

score 1 · Answer 3 · answered Oct 14 '14 at 18:44

1

You could simply use

for i in range(0,len(list1)):
   print list1[i],",",list2[i],",",list3[i]

answered Oct 14 '14 at 18:44

nEO

if you got what you were looking for, please accept this as an answer. – nEO Oct 14 '14 at 18:53
I made a correction. You should is OK. But I should use zip in python since it returns a iterator. – os1 Oct 14 '14 at 19:04

3 Answers3