Appending new items to a list

Question

How do you append a string to a list of strings, particularly, to a specific string in the list?

For example:

myList = ['apples', 'oranges', 'bananas']

newString = 'peach'

I want to append newString to index 1 ('oranges') of myList (so that the newString appears after index 1 in myList.) How would I go about doing that?

Answer 1

Use list.insert:

In [3]: myList = ['apples', 'oranges', 'bananas']

In [4]: myList.insert(1, 'peach')

In [5]: myList
Out[5]: ['apples', 'peach', 'oranges', 'bananas']

1 is the position, 'peach' is the element to insert.

Answer 2

There are two common ways to do this.

1. Use list.insert method, like this

   >>> myList.insert(1, newString)
   >>> myList
   ['apples', 'peach', 'oranges', 'bananas']
   

2. Use slicing to assign an element to the slice 1:1, like this

   >>> myList[1:1] = [newString]
   >>> myList
   ['apples', 'peach', 'oranges', 'bananas']
   

Quoting the documentation,

s.insert(i, x) same as s[i:i] = [x]

Answer 3

There is an inbuilt method for lists known as .insert() which takes 2 arguments , first being the position and the other the object you want to insert, So the code may look like:

myList = ['apples', 'oranges', 'bananas']

newString = 'peach'

position = 1

myList.insert(position, newString)

Answer 4

Just use the list.append method:

myList.append('X')