CODEWITHSUNDEEP
pythonlist
abby
abby

Reputation: 13

How to Merge Lists of Lists

I am working in Python for a coding project. I am stuck on something that seems like it should be a simple fix but haven't had much luck.

Let's say I have two lists, each consisting of smaller lists...

Buckets= [[1,2,3],[1,2,3],[1,2,3]]
Emptybuckets=[[1],[],[3]]

How could I add these together such that I get:

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

Ive tried emptybuckets.append(buckets), for loops (for x in emptybuckets...append) etc.

Any suggestions would be greatly appreciated.

Upvotes: 1

Views: 72

Answers (3)

ListenSoftware Louise Ai Agent
ListenSoftware Louise Ai Agent

Reputation: 4263

you can append the lists using numpy.

Buckets= [[1,2,3],[1,2,3],[1,2,3]]
Emptybuckets=[[1],[],[3]]

for item in zip(Buckets,Emptybuckets):
    print(np.append(item[0],item[1],axis=0).astype(int))

output:

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

Upvotes: 0

anon582847382
anon582847382

Reputation: 20391

Use zip to group corresponding indices together, then adding them is easy:

[a+b for a, b in zip(Buckets, Emptybuckets)]
# [[1, 2, 3, 1], [1, 2, 3], [1, 2, 3, 3]]

Or if you want it exactly how it is in your question, just sort each one as you go:

[sorted(a+b) for a, b in zip(Buckets, Emptybuckets)]
# [[1, 1, 2, 3], [1, 2, 3], [1, 2, 3, 3]]

Upvotes: 6

AtAFork
AtAFork

Reputation: 376

Alex Thornton's answer is correct, and I would say that you should include sorted if you want the numbers ordered as you state in your question

[sorted(a+b) for a, b in zip(Buckets, Emptybuckets)]

Upvotes: 2

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