'Constructor for JSONEncoder, with sensible defaults.
If skipkeys is false, then it is a TypeError to attempt
encoding of keys that are not str, int, long, float or None.  If
skipkeys is True, such items are simply skipped.
If ensure_ascii is true, the output is guaranteed to be str
objects with all incoming unicode characters escaped.  If
ensure_ascii is false, the output will be unicode object.
If check_circular is true, then lists, dicts, and custom encoded
objects will be checked for circular references during encoding to
prevent an infinite recursion (which would cause an OverflowError).
Otherwise, no such check takes place.
If allow_nan is true, then NaN, Infinity, and -Infinity will be
encoded as such.  This behavior is not JSON specification compliant,
but is consistent with most JavaScript based encoders and decoders.
Otherwise, it will be a ValueError to encode such floats.
If sort_keys is true, then the output of dictionaries will be
sorted by key; this is useful for regression tests to ensure
that JSON serializations can be compared on a day-to-day basis.
If indent is a string, then JSON array elements and object members
will be pretty-printed with a newline followed by that string repeated
for each level of nesting. ``None`` (the default) selects the most compact
representation without any newlines. For backwards compatibility with
versions of simplejson earlier than 2.1.0, an integer is also accepted
and is converted to a string with that many spaces.
If specified, separators should be an (item_separator, key_separator)
tuple.  The default is (\', \', \': \') if *indent* is ``None`` and
(\',\', \': \') otherwise.  To get the most compact JSON representation,
you should specify (\',\', \':\') to eliminate whitespace.
If specified, default is a function that gets called for objects
that can\'t otherwise be serialized.  It should return a JSON encodable
version of the object or raise a ``TypeError``.
If encoding is not None, then all input strings will be
transformed into unicode using that encoding prior to JSON-encoding.
The default is UTF-8.
If use_decimal is true (not the default), ``decimal.Decimal`` will
be supported directly by the encoder. For the inverse, decode JSON
with ``parse_float=decimal.Decimal``.
If namedtuple_as_object is true (the default), objects with
``_asdict()`` methods will be encoded as JSON objects.
If tuple_as_array is true (the default), tuple (and subclasses) will
be encoded as JSON arrays.
If bigint_as_string is true (not the default), ints 2**53 and higher
or lower than -2**53 will be encoded as strings. This is to avoid the
rounding that happens in Javascript otherwise.
If specified, item_sort_key is a callable used to sort the items in
each dictionary. This is useful if you want to sort items other than
in alphabetical order by key.
If for_json is true (not the default), objects with a ``for_json()``
method will use the return value of that method for encoding as JSON
instead of the object.
If *ignore_nan* is true (default: ``False``), then out of range
:class:`float` values (``nan``, ``inf``, ``-inf``) will be serialized
as ``null`` in compliance with the ECMA-262 specification. If true,
this will override *allow_nan*.'

def __init__(self, skipkeys=False, ensure_ascii=True, check_circular=True, allow_nan=True, sort_keys=False, indent=None, separators=None, encoding='utf-8', default=None, use_decimal=True, namedtuple_as_object=True, tuple_as_array=True, bigint_as_string=False, item_sort_key=None, for_json=False, ignore_nan=False):

    self.skipkeys = skipkeys
    self.ensure_ascii = ensure_ascii
    self.check_circular = check_circular
    self.allow_nan = allow_nan
    self.sort_keys = sort_keys
    self.use_decimal = use_decimal
    self.namedtuple_as_object = namedtuple_as_object
    self.tuple_as_array = tuple_as_array
    self.bigint_as_string = bigint_as_string
    self.item_sort_key = item_sort_key
    self.for_json = for_json
    self.ignore_nan = ignore_nan
    if ((indent is not None) and (not isinstance(indent, string_types))):
        indent = (indent * '    ')
    self.indent = indent
    if (separators is not None):
        (self.item_separator, self.key_separator) = separators
    elif (indent is not None):
        self.item_separator = ','
    if (default is not None):
        self.default = default
    self.encoding = encoding
