Nested string list with for loop

Question

I have the two following nested lists

List 1: [["Bob", "Davon", "Alex"],["Dylan","Rose", "Hard"]] 

List 2: [["Red", "Black"] , ["Blue", "Green"], ["Yellow", "Pink"]]

And want to show the first word of each list within the nest together, the second etc. So that the outcome would be:

['Bob and Dylan', 'Davon and Rose', 'Alex and Hard'] --> for the first list

['Red and Blue and Yellow, 'Black and Green and Pink'] --> for the second list

So the first outcome I can get with the following code

name_list = [["Bob", "Davon", "Alex"],["Dylan","Rose", "Hard"]] 

def addition(name_list):    
    new_list = []
    for i in range(len(name_list)):
        for j in range(len(name_list[i])):
            new_list.append(name_list[i][j] + " and " + name_list[i+1][j])
        return new_list       

addition (name_list)

But the second list: [["Red", "Black"] , ["Blue", "Green"], ["Yellow", "Pink"]] does not provide the right outcome.

The answers below both give the right idea, although I don't think they explicitly make the main point which should be that zip(*my_list) transposes your lists of lists into new versions which are then easy to manipulate into the detailed strings you want. — Andrew Jaffe
– Andrew Jaffe, Commented Oct 2, 2019 at 21:17

inspectorG4dget · Accepted Answer · 2019-10-02 20:57:56Z

1

names_list = ["{} and {}".format(*t) for t in zip(*name_list)]
colors_list = ["{} and {}".format(*t) for t in zip(*color_list)]

This probably won't work on python2.7 and you're better off upgrading to python3 anyways, since python2 is reaching end of life

answered Oct 2, 2019 at 20:57

inspectorG4dget

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2 Comments

ggorlen Over a year ago

Works fine in Python 2.7 for me.

whydoubt Over a year ago

There are three pair being zipped for color_list, so you actually need ["{} and {} and {}".format(*t) for t in zip(*color_list)]

whydoubt · Accepted Answer · 2019-10-02 21:31:55Z

0

[' and '.join(x) for x in zip(*name_list)]
[' and '.join(x) for x in zip(*color_list)]

str.join() will work on a list of any size, placing the string between each item.

edited Oct 2, 2019 at 21:31

answered Oct 2, 2019 at 21:06

whydoubt

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