list comprehension to combine 2 lists

user_8633489 0
Viewed 6898

I have two sequence as below

t = [[1,2,3],[4,5,6],[7,8,9]]
alpha = ['a','b','c']

How to use list comprehension to modify t as below:-

t = [[1,2,3,'a'],[4,5,6,'b'],[7,8,9,'c']]
python-2.7 list python
3 Answers

use zip:

t = [[1,2,3],[4,5,6],[7,8,9]]
alpha = ['a','b','c']
new_list = [a+[b] for a, b in zip(t, alpha)]

Output:

[[1, 2, 3, 'a'], [4, 5, 6, 'b'], [7, 8, 9, 'c']]
user_73267380

You could use zip to get corresponding pairs of elements, and from there it's just a matter of joining:

>>> t = [[1,2,3],[4,5,6],[7,8,9]]
>>> alpha = ['a','b','c']
>>> [x[0] + [x[1]] for x in zip(t,alpha)]
[[1, 2, 3, 'a'], [4, 5, 6, 'b'], [7, 8, 9, 'c']]
user_24227760

Iterate over the indices:

t = [[1,2,3],[4,5,6],[7,8,9]]
alpha = ['a','b','c']
print([t[i] + [alpha[i]] for i in range(len(alpha))])
user_53225740
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