code: def description_for_number(numobj, lang, script=None, region=None):
      
      ntype = number_type(numobj)
      if ntype == PhoneNumberType.UNKNOWN:
          return ""
      elif not is_number_type_geographical(ntype, numobj.country_code):
          return country_name_for_number(numobj, lang, script, region)
      return description_for_valid_number(numobj, lang, script, region)
docs: Return a text description of a PhoneNumber object for the given language.
  
      The description might consist of the name of the country where the phone
      number is from and/or the name of the geographical area the phone number
      is from.  This function explicitly checks the validity of the number passed in
  
      Arguments:
      numobj -- The PhoneNumber object for which we want to get a text description.
      lang -- A 2-letter lowercase ISO 639-1 language code for the language in
                    which the description should be returned (e.g. "en")
      script -- A 4-letter titlecase (first letter uppercase, rest lowercase)
                    ISO script code as defined in ISO 15924, separated by an
                    underscore (e.g. "Hant")
      region -- The region code for a given user. This region will be omitted
                    from the description if the phone number comes from this
                    region. It should be a two-letter upper-case CLDR region
                    code.
  
      Returns a text description in the given language code, for the given phone
      number, or an empty string if no description is available.