CODEWITHSUNDEEP
python
sleeping_with_fishes
sleeping_with_fishes

Reputation: 41

How to delete empty strings from a 2d list

I have this 2d list right here : 

list = [ [1,2,3], [1,'',''], ['','','']]

I want to delete every instance of '' in the list, so that the output should look like this:

>> [ [1,2,3],[1]]

I think that deleting all the ''-s is gonna left me out with this list, so could you please also explain how to get rid of empty lists in 2d lists? 

>> [ [1,2,3],[1],[]]

Thank you!

Upvotes: 0

Views: 1033

Answers (3)

Derek Eden
Derek Eden

Reputation: 4638

could also use filter:

lst = [ [1,2,3], [1,'',''], ['','','']] #don't use list to define a list
list(filter(None,[list(filter(None,l)) for l in lst]))

output:

[[1, 2, 3], [1]]

Upvotes: 1

AidanGawronski
AidanGawronski

Reputation: 2085

A one liner with nested list comprehensions (not very dry though):

[[y for y in x if y != ''] for x in list if [y for y in x if y != ''] != []]
# [[1, 2, 3], [1]]

Upvotes: 0

ComplicatedPhenomenon
ComplicatedPhenomenon

Reputation: 4199

a = [[1,2,3], [1,'',''], ['','','']] 
b = [[i for i in item if i != ''] for item in a]
c = [item for item in b if item != []]
print(b)
print(c)

Output

[[1, 2, 3], [1], []]
[[1, 2, 3], [1]]

Upvotes: 4

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