Suppress warning for not using custom encoding.

[white-gecko]

Suppress the warning "NQuadsSerializer/NTSerializer does not use custom encoding." in the case that the encoding argument (custom encoding) is set to the same value as the default encoding (self.encoding).

This is especially relevant, if one is selecting the NQuadsSerializer/NTSerializer for serializing query results, since it is setting utf-8 as encoding:

rdflib/rdflib/query.py

Lines 203 to 230 in 0469adb

	def serialize(
	self, destination=None, encoding="utf-8", format='xml', **args):
	if self.type in ('CONSTRUCT', 'DESCRIBE'):
	return self.graph.serialize(
	destination, encoding=encoding, format=format, **args)
	"""stolen wholesale from graph.serialize"""
	from rdflib import plugin
	serializer = plugin.get(format, ResultSerializer)(self)
	if destination is None:
	stream = BytesIO()
	stream2 = EncodeOnlyUnicode(stream)
	serializer.serialize(stream2, encoding=encoding, **args)
	return stream.getvalue()
	if hasattr(destination, "write"):
	stream = destination
	serializer.serialize(stream, encoding=encoding, **args)
	else:
	location = destination
	scheme, netloc, path, params, query, fragment = urlparse(location)
	if netloc != "":
	print("WARNING: not saving as location" +
	"is not a local file reference")
	return
	fd, name = tempfile.mkstemp()
	stream = os.fdopen(fd, 'wb')
	serializer.serialize(stream, encoding=encoding, **args)

[joernhees]

👍 thanks