adding char to string code example

Example 1: how to add char to string python

def addChar(text,char,place):
  return text[:place] + char + text[place:]

Example 2: insert character into string

x <- "abcde"
stri_sub(x, 3, 2) # from 3 to 2 so... zero ?
# [1] ""
stri_sub(x, 3, 2) <- 1 # substitute from 3 to 2 ... hmm
x
# [1] "ab1cde"