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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def example_number_for_type(region_code, num_type):
 """Gets a valid number for the specified region and number type. If None is given as the region_code, then the returned number object may belong to any country. Arguments: region_code -- The region for which an example number is needed, or None. num_type -- The type of number that is needed. Returns a valid number for the specified region and type. Returns None when the metadata does not contain such information or if an invalid region or region 001 was specified. For 001 (representing non-geographical numbers), call example_number_for_non_geo_entity instead. """

    if region_code is None:
        return _example_number_anywhere_for_type(num_type)
    # Check the region code is valid.
    if not _is_valid_region_code(region_code):
        return None
    metadata = PhoneMetadata.metadata_for_region(region_code.upper())
    desc = _number_desc_by_type(metadata, num_type)
    if desc is not None and desc.example_number is not None:
        try:
            return parse(desc.example_number, region_code)
        except NumberParseException:  # pragma no cover
            pass
    return None