How to Merge Lists in Python

If you ever have multiple lists in Python that you want to combine in one list, don’t panic. Python actually makes it really easy to perform a function like this. You can combine and concatenate lists just by using the plus (+) symbol — seriously, it doesn’t get much easier than that. If you want to get a better idea for how merging lists works, check out the example below.

Let’s say we have two lists, and they’re defined as such:

listone = [9, 13, 16]
 listtwo = [21, 36, 54]

And now let’s say we want to merge the lists together to create one list. Here’s how that can be done:

newlist = listone + listtwo
  print newlist

The output of the code above would be: 9, 13, 16, 21, 36, 54. And the new list, of course, would be defined like this: newlist = [9, 13, 16, 21, 36, 54]. It’s that easy to combine two lists to create a new one.

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