Pythonic way to append multiple values to a list [duplicate]

Question

To be clear I have found some similar questions, but (to the best of my knowledge) none of them are either concise enough or exactly what I am looking for.

I have a list(of ints) and two other ints, and want to make them all into one list. Right now I have:

old_list = [1, 2, 3]
first_int = 3
second_int = 5

new_list = old_list
new_list.append(first_int)
new_list.append(second_int) 

# new_list == [1, 2, 3, 3, 5]

I feel that there is a more Pythonic way to do this but I am unsure exactly how.
The order of 'new_list' is not important.

Thank you in advance.

DeepSpace · Accepted Answer · 2015-12-21 14:18:03Z

4

You extend a list, for example:

new_list.extend([first_int, second_int])

By the way, your code also modifies old_list because new_list is just a reference to old_list.

If you really want a new list:

new_list = old_list[:]

answered Dec 21, 2015 at 14:18

DeepSpace

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1 Comment

Beyarkay Over a year ago

The code modifying old_list is a typo on my part. Before when I actually wanted a new list and not a reference to the previous one I've been using new_list = old_list.copy() Is there a difference between that and what you've shown?

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