Python List Append Multiple Elements

I want to append multiple elements to my list at once. I tried this >>> l = [] >>> l.append('a') >>> l ['a'] >>> l.append('b').append('c') Tra

Solution 1:

The method append() works in place. In other words, it modifies the list, and doesn't return a new one.

So, if l.append('b') doesn't return anything (in fact it returns None), you can't do:

l.append('b').append('c')

because it will be equivalent to

None.append('c')

Answering the question: how can I append 'b' and 'c' at once?

You can use extend() in the following way:

l.extend(('b', 'c'))

Solution 2:

Use list.extend:

>>>l = []>>>l.extend(('a', 'b'))>>>l
['a', 'b']

Note that similar to list.append, list.extend also modifies the list in-place and returns None, so it is not possible to chain these method calls.

But when it comes to string, their methods return a new string. So, we can chain methods call on them:

>>>s = 'foobar'>>>s.replace('o', '^').replace('a', '*').upper()
'F^^B*R'

Solution 3:

l = []
l.extend([1,2,3,4,5])

There is a method for your purpose.