CODEWITHSUNDEEP
python-3.x
Erik Sven Broberg
Erik Sven Broberg

Reputation: 125

Merge items from separate lists into nested lists

Hello I am trying to merge two lists sequentially into sub lists. I wonder if this is possible without list comprehensions or a lambda operation as I'm still learning how to work with those approaches. Thank you

a = [0,1,2,3]
b = [4,5,6,7]

#desired output
c = [0,4],[1,5],[2,6],[3,7]

Upvotes: 0

Views: 35

Answers (2)

xrisk
xrisk

Reputation: 3898

Here’s a solution suitable for beginners!

c = []
a = [0,1,2,3]
b = [4,5,6,7]

for i in range(min(len(a), len(b))):
    c.append([a[i], b[i]]) # writing [a[i], b[i]] creates a new list 

print(c)

Upvotes: 0

Dimitris Fasarakis Hilliard
Dimitris Fasarakis Hilliard

Reputation: 160577

An approach that doesn't involve lambdas or list comprehensions (not sure what the issue is with list-comps) would be with map:

c = list(map(list, zip(a, b)))

This first zips the lists together, then creates a list instance for every tuple generated from zip with map and wraps it all up in list in order for map to yield all it's contents:

print(c)
[[0, 4], [1, 5], [2, 6], [3, 7]]

This, at least in my view, is less understandable than the equivalent comprehension John supplied in a comment.

Upvotes: 1

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