def replace(s, old, new, maxreplace=-<NUM_LIT:1>):
return s.replace(old, new, maxreplace)<EOL>
replace (str, old, new[, maxreplace]) -> string

    Return a copy of string str with all occurrences of substring
    old replaced by new. If the optional argument maxreplace is
    given, only the first maxreplace occurrences are replaced.