CODEWITHSUNDEEP
pythonpython-3.xlist
user9431057
user9431057

Reputation: 1253

Get a list of lists, iterating a list of lists

I have a list of lists like this,

big_list = [[1,3,5], [1,2,5], [9,3,5]]

sec_list = [1,3,5]

I want to iterate through the big_list and check each list values against the sec_list. While I check, I want to store the values that are not matching into a another list of lists. So, I did this:

sma_list = []
for each in big_list:
    for i,j in zip(each, sec_list):
        if i!=j:
            sma_list.append(i)

I get the result like this:

[2, 9]

However, I need a list of lists like this,

[[2], [9]]

How can I achieve this?

Upvotes: 5

Views: 131

Answers (1)

Mad Physicist
Mad Physicist

Reputation: 114310

Short answer, 

sma_list.append([i])

Enclosing a value in square brackets makes it the first element of a one element list.

This will only work correctly if you have one missing element per list. You're much better off using a comprehension for the whole thing:

sma_list = [[i for i, j in zip(each, sec_list) if i != j] for each in big_list]

Upvotes: 4

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