#  Elvis.py  Copyright (c) Kari Laitinen

#  http://www.naturalprogramming.com

#  2006-05-24  File created.
#  2022-12-16  Converted to Python 3.

#  This program demonstrates how a list of characters can be
#  used. The list of characters is actually a list of single-
#  character strings.

#  Strings cannot be modified because they are immutable sequences.
#  Lists, on the other hand, are mutable sequences that can be
#  modified.

#  If we want to modify a string like the one below, we can convert
#  the string into a list with the list() built-in function.

#  When we want to print the modified text, we can convert the
#  list of characters back to a string with the string method join().


character_positions   =    "0123456789012345678901"

elvis_sentence  =  list(  "Elvis was a rock star." )

print( "\n   "  +  character_positions )

print( "\n   "  +  "".join( elvis_sentence ) )

elvis_sentence[ 12 ]  =  'm'
elvis_sentence[ 14 ]  =  'v'
elvis_sentence[ 15 ]  =  'i'
elvis_sentence[ 16 ]  =  'e'

print( "\n   "  +  "".join( elvis_sentence ) )