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"""
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Extended JSON encoder with support for more data types
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json.org does not specify how date time can be represented - just encode it somehow and ignore decoding ...
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"""
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import datetime
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import decimal
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import functools
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import json
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__all__ = ['dumps', 'dump', 'load', 'loads']
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def _is_tz_aware(value):
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"""
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Determines if a given datetime.time is timezone aware.
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The logic is described in Python's docs:
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http://docs.python.org/library/datetime.html#datetime.tzinfo
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"""
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return (value.tzinfo is not None
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and value.tzinfo.utcoffset(value) is not None)
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def _obj_dump(obj):
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"""
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Custom function for dumping objects to JSON, if obj has __json__ attribute
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or method defined it will be used for serialization
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:param obj:
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"""
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if isinstance(obj, complex):
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return [obj.real, obj.imag]
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# See "Date Time String Format" in the ECMA-262 specification.
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# some code borrowed from django 1.4
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elif isinstance(obj, datetime.datetime):
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r = obj.isoformat()
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if obj.microsecond:
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r = r[:23] + r[26:]
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if r.endswith('+00:00'):
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r = r[:-6] + 'Z'
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return r
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elif isinstance(obj, datetime.date):
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return obj.isoformat()
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elif isinstance(obj, decimal.Decimal):
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return str(obj)
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elif isinstance(obj, datetime.time):
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if _is_tz_aware(obj):
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raise ValueError("JSON can't represent timezone-aware times.")
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r = obj.isoformat()
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if obj.microsecond:
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r = r[:12]
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return r
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elif isinstance(obj, set):
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return list(obj)
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elif hasattr(obj, '__json__'):
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if callable(obj.__json__):
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return obj.__json__()
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else:
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return obj.__json__
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else:
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raise NotImplementedError
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class ExtendedEncoder(json.JSONEncoder):
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def default(self, obj):
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try:
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return _obj_dump(obj)
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except NotImplementedError:
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pass # quiet skipping of unsupported types!
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raise TypeError("%r is not JSON serializable" % (obj,))
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dumps = functools.partial(json.dumps, cls=ExtendedEncoder)
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dump = functools.partial(json.dump, cls=ExtendedEncoder)
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# No special support for loading these types back!!!
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load = json.load
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loads = json.loads
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