CODEWITHSUNDEEP
python-3.4
Nitish Kumar Pal
Nitish Kumar Pal

Reputation: 2986

In Python how remove extra space elements from two dimensional array?

For eg.

list = [['2', '2', '', ''], ['3', '3', '', ''], ['4', '4', '', '']]

and i want as

newlist = [['2','2'],['3','3'],['4','4']]

is there any list comprehensive compact way to achieve this like for 1D array we have [x for x in strings if x] is there any thing similar to this.

Upvotes: 1

Views: 1323

Answers (4)

Rudresh Panchal
Rudresh Panchal

Reputation: 1000

I think you mean you wish to remove empty elements fromm your 2darray. If that is the case then:

old_list = [['2', '2', '', ''], ['3', '3', '', ''], ['4', '4', '', '']]
new_list = [[instance for instance in sublist if len(instance)>0] for sublist in old_list]

If you wish to remove elements containing only whitespace(spaces etc), then yoy may do something like:

old_list = [['2', '2', '', ''], ['3', '3', '', ''], ['4', '4', '', '']]
new_list = [[instance for instance in sublist if not instance.isspace()] for sublist in old_list]

Upvotes: 3

Govind
Govind

Reputation: 444

use this list comprehension:

list = [[x for x in a if x] for a in list]

Upvotes: 0

Kai
Kai

Reputation: 1769

You can achieve this using filter. Also unrelated but since list is a reserved word it's best not to use it and try to come up with a more meaningful name, I've simply renamed it to original_list since the list() method won't work otherwise.

original_list = [['2', '2', '', ''], ['3', '3', '', ''], ['4', '4', '', '']]
new_list = []
for sub_list in original_list:
    new_sub_list = list(filter(None, sub_list))
    new_list.append(new_sub_list)

print(new_list)

Or in short

new_list2 = [ list(filter(None, sub_list)) for sub_list in original_list ]
print(new_list2)

Upvotes: 1

Faruk D.
Faruk D.

Reputation: 169

list = [[x for x in y if x != ''] for y in list]

Upvotes: 2

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