code: def renderContents(self, encoding=DEFAULT_OUTPUT_ENCODING,
                         prettyPrint=False, indentLevel=0):
          
          s=[]
          for c in self:
              text = None
              if isinstance(c, NavigableString):
                  text = c.__str__(encoding)
              elif isinstance(c, Tag):
                  s.append(c.__str__(encoding, prettyPrint, indentLevel))
              if text and prettyPrint:
                  text = text.strip()
              if text:
                  if prettyPrint:
                      s.append(" " * (indentLevel-1))
                  s.append(text)
                  if prettyPrint:
                      s.append("\n")
          return ''.join(s)
docs: Renders the contents of this tag as a string in the given
          encoding. If encoding is None, returns a Unicode string..