how to replace a specific charactor in a index of a list code example

Example 1: python string replace index

# strings are immutable in Python, 
# we have to create a new string which 
# includes the value at the desired index

s = s[:index] + newstring + s[index + 1:]

Example 2: python string replace by index

def replace_str_index(text,index=0,replacement=''):
    return '%s%s%s'%(text[:index],replacement,text[index+1:])