code: def compile_replace(pattern, repl, flags=0):
      
  
      call = None
      if pattern is not None and isinstance(pattern, _RE_TYPE):
          if isinstance(repl, (str, bytes)):
              if not (pattern.flags & DEBUG):
                  call = _cached_replace_compile(pattern, repl, flags, type(repl))
              else:  # pragma: no cover
                  call = _bre_parse._ReplaceParser().parse(pattern, repl, bool(flags & FORMAT))
          elif isinstance(repl, ReplaceTemplate):
              if flags:
                  raise ValueError("Cannot process flags argument with a ReplaceTemplate!")
              if repl.pattern_hash != hash(pattern):
                  raise ValueError("Pattern hash doesn't match hash in compiled replace!")
              call = repl
          else:
              raise TypeError("Not a valid type!")
      else:
          raise TypeError("Pattern must be a compiled regular expression!")
      return call
docs: Construct a method that can be used as a replace method for `sub`, `subn`, etc.