CODEWITHSUNDEEP
pythonlist
user1369478
user1369478

Reputation: 107

processing of list of list

I am working on lists of list

input: 

x = [['a','a','a'],['b','b','b'],['c','c','c'],['d','d','d']]

and am looking for an output:

s = ['a_b_c_d','a_b_c_d','a_b_c_d']

Kindly let me know how can I do this using list comprehension.

Upvotes: 2

Views: 117

Answers (2)

NPE
NPE

Reputation: 500963

In [6]: x = [['a','a','a'],['b','b','b'],['c','c','c'],['d','d','d']]

In [7]: ['_'.join(s) for s in zip(*x)]
Out[7]: ['a_b_c_d', 'a_b_c_d', 'a_b_c_d']

As requested, this uses a list comprehension. See @eumiro's answer for a map()-based solution that I think is just as good.

Upvotes: 11

eumiro
eumiro

Reputation: 213125

>>> x = [['a','a','a'],['b','b','b'],['c','c','c'],['d','d','d']]
>>> map('_'.join, zip(*x))
['a_b_c_d', 'a_b_c_d', 'a_b_c_d']

… although @aix's list comprehension is more list-comprehensible.

Upvotes: 12

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