code: def is_valid_short_number_for_region(short_numobj, region_dialing_from):
      
      if not _region_dialing_from_matches_number(short_numobj, region_dialing_from):
          return False
      metadata = PhoneMetadata.short_metadata_for_region(region_dialing_from)
      if metadata is None:  # pragma no cover
          return False
      short_number = national_significant_number(short_numobj)
      general_desc = metadata.general_desc
      if not _matches_possible_number_and_national_number(short_number, general_desc):
          return False
      short_number_desc = metadata.short_code
      if short_number_desc.national_number_pattern is None:  # pragma no cover
          return False
      return _matches_possible_number_and_national_number(short_number, short_number_desc)
docs: Tests whether a short number matches a valid pattern in a region.
  
      Note that this doesn't verify the number is actually in use, which is
      impossible to tell by just looking at the number itself.
  
      Arguments:
      short_numobj -- the short number to check as a PhoneNumber object.
      region_dialing_from -- the region from which the number is dialed
  
      Return whether the short number matches a valid pattern