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Lola Tesla
Lola Tesla

Reputation: 29

Creating one nested list from separate lists

Say I have the following lists:

list_1 = [1, 2, 3]
list_2 = ['a', 'b', 'c']
list_3 = ['red', 'yellow', 'blue']

And I want to create one list of lists, as follows:

combined_list = [[1, 'a', 'red'],
                 [2, 'b', 'yellow'],
                 [3, 'c', 'blue']]

What is the best way of going about this?

Upvotes: 2

Views: 67

Answers (3)

kebab-case
kebab-case

Reputation: 1852

Just use zip. You will need to cast each produced tuple into a list and use a list comprehension as the following example:

combined_list = [list(tuple) for tuple in zip(list_1, list_2, list_3)]

Upvotes: 2

Александр
Александр

Reputation: 289

list_1 = [1, 2, 3] 
list_2 = ['a', 'b', 'c'] 
list_3 = ['red', 'yellow', 'blue']

combined_list = []
combined_list+=map(list, zip(list_1, list_2, list_3))
print(combined_list)

Result:

[[1, 'a', 'red'], [2, 'b', 'yellow'], [3, 'c', 'blue']]

Upvotes: 1

sudo97
sudo97

Reputation: 914

ASSUMPTIONS:

All your lists list_1,list_2 and list_3 are of equal length

Solution

You simply iterate through the list and append the combined list for each index to an an empty list

def combine(l1,l2,l3):
    res = []
    for i in range(len(l1)):
        res.append([l1[i],l2[i],l3[i]])
    return res

Now you can simply call this function with your lists list_1, list_2 and list_3 like this

combined = combine(list_1,list_2,list_3)

Upvotes: 0

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