Join special characters in list elements

Question

How to join some special characters in a particular element in a list?

eg

lst = ['Bhanu','23','08','1989','Hello World']

How to add a special character "/" in between 23 , 08 , 1989 and make it as '23/08/1989' as a single element of a list?

Answer 1

You want to replace the middle 3 elements, and use the str.join() method to produce the replacement:

lst[1:4] = ['/'.join(lst[1:4])]

Note that the right-hand-side expression is put into a list object, so you can replace multiple elements in the original list with just the one result.

Demo:

>>> lst = ['Bhanu','23','08','1989','Hello World']
>>> '/'.join(lst[1:4])
'23/08/1989'
>>> lst[1:4] = ['/'.join(lst[1:4])]
>>> lst
['Bhanu', '23/08/1989', 'Hello World']