How to initialize a list and extend it with another list in one line? [duplicate]

Question

This sounds like a super easy question, so I'm surprised that searching didn't yield any results: I want to initialize a list of constants and extend it with a list from another source.

This works:

remoteList = [2, 3, 4]
myList = [0,1]
myList.extend(remoteList)

Which means it gives the expected results:

myList
[0, 1, 2, 3, 4]

However, doing the list initialization in one line doesn't work, myList is left undefined:

remoteList = [2, 3, 4]
myList = [0,1].extend(remoteList)

Is there a way to initialize the list and extend it with another list (in a pythonic way) in one line? Why doesn't my one line example work, or at least produce some sort of list?

Answer 1

You can use unpacking inside the list literal

myList = [0, 1, *remoteList]

This is part of the unpacking generalizations made available in Python 3.5

Answer 2

Are not you just asking about the + list concatenation operation:

In [1]: remoteList = [2, 3, 4]

In [2]: myList = [0, 1] + remoteList

In [3]: myList
Out[3]: [0, 1, 2, 3, 4]

Works for both Python 2 and 3.

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There are some slight differences between "extend" and "plus":

• Concatenating two lists - difference between '+=' and extend()