[python] Saving utf-8 texts with json.dumps as UTF8, not as \u escape sequence

Peters' python 2 workaround fails on an edge case:

d = {u'keyword': u'bad credit  \xe7redit cards'}
with io.open('filename', 'w', encoding='utf8') as json_file:
    data = json.dumps(d, ensure_ascii=False).decode('utf8')
    try:
        json_file.write(data)
    except TypeError:
        # Decode data to Unicode first
        json_file.write(data.decode('utf8'))

UnicodeEncodeError: 'ascii' codec can't encode character u'\xe7' in position 25: ordinal not in range(128)

It was crashing on the .decode('utf8') part of line 3. I fixed the problem by making the program much simpler by avoiding that step as well as the special casing of ascii:

with io.open('filename', 'w', encoding='utf8') as json_file:
  data = json.dumps(d, ensure_ascii=False, encoding='utf8')
  json_file.write(unicode(data))

cat filename
{"keyword": "bad credit  çredit cards"}

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