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The example works for me with both python 2 and 3. I'm going to close this in a while if OP doesn't reply.
$ python2 -c "import json; json.dump({'name': '港区'}, open('py2.json', 'w'), indent=4, separators=(',', ': '), ensure_ascii=False)" && cat py2.json
{
 "name": "港区"
}
$ python3 -c "import json; json.dump({'name': '港区'}, open('py3.json', 'w'), indent=4, separators=(',', ': '), ensure_ascii=False)" && cat py3.json
{
 "name": "港区"
}