Python: String replace index

Question

I mean, i want to replace str[9:11] for another string. If I do str.replace(str[9:11], \"###\") It doesn\'t work, because the sequence [9:11] can b

Answer 1

you can do

s="cdabcjkewabcef"
snew="".join((s[:9],"###",s[12:]))

which should be faster than joining like snew=s[:9]+"###"+s[12:] on large strings