code: def formataddr(pair, charset='utf-8'):
      
      name, address = pair
      # The address MUST (per RFC) be ascii, so raise an UnicodeError if it isn't.
      address.encode('ascii')
      if name:
          try:
              name.encode('ascii')
          except UnicodeEncodeError:
              if isinstance(charset, str):
                  charset = Charset(charset)
              encoded_name = charset.header_encode(name)
              return "%s <%s>" % (encoded_name, address)
          else:
              quotes = ''
              if specialsre.search(name):
                  quotes = '"'
              name = escapesre.sub(r'\\\g<0>', name)
              return '%s%s%s <%s>' % (quotes, name, quotes, address)
      return address
docs: The inverse of parseaddr(), this takes a 2-tuple of the form
      (realname, email_address) and returns the string value suitable
      for an RFC 2822 From, To or Cc header.
  
      If the first element of pair is false, then the second element is
      returned unmodified.
  
      Optional charset if given is the character set that is used to encode
      realname in case realname is not ASCII safe.  Can be an instance of str or
      a Charset-like object which has a header_encode method.  Default is
      'utf-8'.