# -*- coding: utf-8 -*-

try:
    basestring
except NameError:
    basestring = str


def pretty_print_json(jdata):
    buf = []
    _pp_dict(jdata, 0, buf)
    return "".join(buf)

def _pp_dict(dct, depth, buf):
    space = "  " * depth
    buf.append('{\n')
    for k, v in dct.items():
        buf.append('%s  "%s": ' % (space, k))  # TODO: escape k
        if isinstance(v, list):
            _pp_list(v, depth+1, buf)
        elif isinstance(v, dict):
            _pp_dict(v, depth+1, buf)
        else:
            _pp_scalar(v, depth+1, buf)
        buf.append(',\n')
    if buf[-1] == ',\n':
        buf.pop()
        buf.append('\n')
    buf.append(space)
    buf.append('}')

def _pp_list(lst, depth, buf):
    space = "  " * depth
    buf.append('[\n')
    for x in lst:
        buf.append(space)
        if isinstance(x, list):
            _pp_list(x, depth+1, buf)
        elif isinstance(x, dict):
            buf.append('  ')
            _pp_dict(x, depth+1, buf)
        else:
            _pp_scalar(x, depth+1, buf)
        buf.append(',\n')
    if buf[-1] == ',\n':
        buf.pop()
        buf.append('\n')
    buf.append(space)
    buf.append(']')

def _pp_scalar(scalar, depth, buf):
    buf.append(_repr_scalar(scalar))

def _repr_scalar(scalar):
    if scalar is None:
        return "null"
    elif scalar is True:
        return "true"
    if scalar is False:
        return "false"
    if isinstance(scalar, basestring):
        return '"%s"' % scalar.replace('"', r'\"')
    if isinstance(scalar, (int, float)):
        return str(scalar)
    raise TypeError("%r: unknown data type" % (scalar,))


if __name__ == '__main__':
    jdata = {
      "books": [
        {
           "id": 101,
           "title": u"すごい本",
           "authors": [
             {
               "id": 2001,
               "name": u"著者1"
             },
             {
               "id": 2001,
               "name": u"著者2"
             }
           ]
        },
        {
          "id": 102,
          "title": u"もっとすごい本",
          "authors": [
            {
              "id": 2103,
              "name": u"著者3"
            }
          ]
        }
      ]
    }
    s = pretty_print_json(jdata)
    print(s.encode('utf-8'))