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- # coding: utf-8
- import pytest
- from pandas.io.msgpack import packb, unpackb
- class DecodeError(Exception):
- pass
- class TestObj(object):
- def _arr_to_str(self, arr):
- return ''.join(str(c) for c in arr)
- def bad_complex_decoder(self, o):
- raise DecodeError("Ooops!")
- def _decode_complex(self, obj):
- if b'__complex__' in obj:
- return complex(obj[b'real'], obj[b'imag'])
- return obj
- def _encode_complex(self, obj):
- if isinstance(obj, complex):
- return {b'__complex__': True, b'real': 1, b'imag': 2}
- return obj
- def test_encode_hook(self):
- packed = packb([3, 1 + 2j], default=self._encode_complex)
- unpacked = unpackb(packed, use_list=1)
- assert unpacked[1] == {b'__complex__': True, b'real': 1, b'imag': 2}
- def test_decode_hook(self):
- packed = packb([3, {b'__complex__': True, b'real': 1, b'imag': 2}])
- unpacked = unpackb(packed, object_hook=self._decode_complex,
- use_list=1)
- assert unpacked[1] == 1 + 2j
- def test_decode_pairs_hook(self):
- packed = packb([3, {1: 2, 3: 4}])
- prod_sum = 1 * 2 + 3 * 4
- unpacked = unpackb(
- packed, object_pairs_hook=lambda l: sum(k * v for k, v in l),
- use_list=1)
- assert unpacked[1] == prod_sum
- def test_only_one_obj_hook(self):
- msg = "object_pairs_hook and object_hook are mutually exclusive"
- with pytest.raises(TypeError, match=msg):
- unpackb(b'', object_hook=lambda x: x,
- object_pairs_hook=lambda x: x)
- def test_bad_hook(self):
- msg = r"can't serialize \(1\+2j\)"
- with pytest.raises(TypeError, match=msg):
- packed = packb([3, 1 + 2j], default=lambda o: o)
- unpacked = unpackb(packed, use_list=1) # noqa
- def test_array_hook(self):
- packed = packb([1, 2, 3])
- unpacked = unpackb(packed, list_hook=self._arr_to_str, use_list=1)
- assert unpacked == '123'
- def test_an_exception_in_objecthook1(self):
- with pytest.raises(DecodeError, match='Ooops!'):
- packed = packb({1: {'__complex__': True, 'real': 1, 'imag': 2}})
- unpackb(packed, object_hook=self.bad_complex_decoder)
- def test_an_exception_in_objecthook2(self):
- with pytest.raises(DecodeError, match='Ooops!'):
- packed = packb({1: [{'__complex__': True, 'real': 1, 'imag': 2}]})
- unpackb(packed, list_hook=self.bad_complex_decoder, use_list=1)
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