code: public PyCodeBuilder appendLine(String... codeFragments) {
      code.append(indent);
      append(codeFragments);
      code.append("\n");
      return this;
    }
docs: Appends the current indent, then the given strings, then a newline.
  
  @param codeFragments The code string(s) to append.
  @return This CodeBuilder (for stringing together operations).