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Set up:
>>> from cStringIO import StringIO
>>> from numpy.lib import format
>>>
>>> scalars = [
... np.uint8,
... np.int8,
... np.uint16,
... np.int16,
... np.uint32,
... np.int32,
... np.uint64,
... np.int64,
... np.float32,
... np.float64,
... np.complex64,
... np.complex128,
... object,
... ]
>>>
>>> basic_arrays = []
>>>
>>> for scalar in scalars:
... for endian in '<>':
... dtype = np.dtype(scalar).newbyteorder(endian)
... basic = np.arange(15).astype(dtype)
... basic_arrays.extend([
... np.array([], dtype=dtype),
... np.array(10, dtype=dtype),
... basic,
... basic.reshape((3,5)),
... basic.reshape((3,5)).T,
... basic.reshape((3,5))[::-1,::2],
... ])
...
>>>
>>> Pdescr = [
... ('x', 'i4', (2,)),
... ('y', 'f8', (2, 2)),
... ('z', 'u1')]
>>>
>>>
>>> PbufferT = [
... ([3,2], [[6.,4.],[6.,4.]], 8),
... ([4,3], [[7.,5.],[7.,5.]], 9),
... ]
>>>
>>>
>>> Ndescr = [
... ('x', 'i4', (2,)),
... ('Info', [
... ('value', 'c16'),
... ('y2', 'f8'),
... ('Info2', [
... ('name', 'S2'),
... ('value', 'c16', (2,)),
... ('y3', 'f8', (2,)),
... ('z3', 'u4', (2,))]),
... ('name', 'S2'),
... ('z2', 'b1')]),
... ('color', 'S2'),
... ('info', [
... ('Name', 'U8'),
... ('Value', 'c16')]),
... ('y', 'f8', (2, 2)),
... ('z', 'u1')]
>>>
>>>
>>> NbufferT = [
... ([3,2], (6j, 6., ('nn', [6j,4j], [6.,4.], [1,2]), 'NN', True), 'cc', ('NN', 6j), [[6.,4.],[6.,4.]], 8),
... ([4,3], (7j, 7., ('oo', [7j,5j], [7.,5.], [2,1]), 'OO', False), 'dd', ('OO', 7j), [[7.,5.],[7.,5.]], 9),
... ]
>>>
>>>
>>> record_arrays = [
... np.array(PbufferT, dtype=np.dtype(Pdescr).newbyteorder('<')),
... np.array(NbufferT, dtype=np.dtype(Ndescr).newbyteorder('<')),
... np.array(PbufferT, dtype=np.dtype(Pdescr).newbyteorder('>')),
... np.array(NbufferT, dtype=np.dtype(Ndescr).newbyteorder('>')),
... ]
Test the magic string writing.
>>> format.magic(1, 0)
'\x93NUMPY\x01\x00'
>>> format.magic(0, 0)
'\x93NUMPY\x00\x00'
>>> format.magic(255, 255)
'\x93NUMPY\xff\xff'
>>> format.magic(2, 5)
'\x93NUMPY\x02\x05'
Test the magic string reading.
>>> format.read_magic(StringIO(format.magic(1, 0)))
(1, 0)
>>> format.read_magic(StringIO(format.magic(0, 0)))
(0, 0)
>>> format.read_magic(StringIO(format.magic(255, 255)))
(255, 255)
>>> format.read_magic(StringIO(format.magic(2, 5)))
(2, 5)
Test the header writing.
>>> for arr in basic_arrays + record_arrays:
... f = StringIO()
... format.write_array_header_1_0(f, arr)
... print repr(f.getvalue())
...
"F\x00{'descr': '|u1', 'fortran_order': False, 'shape': (0,)} \n"
"F\x00{'descr': '|u1', 'fortran_order': False, 'shape': ()} \n"
"F\x00{'descr': '|u1', 'fortran_order': False, 'shape': (15,)} \n"
"F\x00{'descr': '|u1', 'fortran_order': False, 'shape': (3, 5)} \n"
"F\x00{'descr': '|u1', 'fortran_order': True, 'shape': (5, 3)} \n"
"F\x00{'descr': '|u1', 'fortran_order': False, 'shape': (3, 3)} \n"
"F\x00{'descr': '|u1', 'fortran_order': False, 'shape': (0,)} \n"
"F\x00{'descr': '|u1', 'fortran_order': False, 'shape': ()} \n"
"F\x00{'descr': '|u1', 'fortran_order': False, 'shape': (15,)} \n"
"F\x00{'descr': '|u1', 'fortran_order': False, 'shape': (3, 5)} \n"
"F\x00{'descr': '|u1', 'fortran_order': True, 'shape': (5, 3)} \n"
"F\x00{'descr': '|u1', 'fortran_order': False, 'shape': (3, 3)} \n"
"F\x00{'descr': '|i1', 'fortran_order': False, 'shape': (0,)} \n"
"F\x00{'descr': '|i1', 'fortran_order': False, 'shape': ()} \n"
"F\x00{'descr': '|i1', 'fortran_order': False, 'shape': (15,)} \n"
"F\x00{'descr': '|i1', 'fortran_order': False, 'shape': (3, 5)} \n"
"F\x00{'descr': '|i1', 'fortran_order': True, 'shape': (5, 3)} \n"
"F\x00{'descr': '|i1', 'fortran_order': False, 'shape': (3, 3)} \n"
"F\x00{'descr': '|i1', 'fortran_order': False, 'shape': (0,)} \n"
"F\x00{'descr': '|i1', 'fortran_order': False, 'shape': ()} \n"
"F\x00{'descr': '|i1', 'fortran_order': False, 'shape': (15,)} \n"
"F\x00{'descr': '|i1', 'fortran_order': False, 'shape': (3, 5)} \n"
"F\x00{'descr': '|i1', 'fortran_order': True, 'shape': (5, 3)} \n"
"F\x00{'descr': '|i1', 'fortran_order': False, 'shape': (3, 3)} \n"
"F\x00{'descr': 'u2', 'fortran_order': False, 'shape': (0,)} \n"
"F\x00{'descr': '>u2', 'fortran_order': False, 'shape': ()} \n"
"F\x00{'descr': '>u2', 'fortran_order': False, 'shape': (15,)} \n"
"F\x00{'descr': '>u2', 'fortran_order': False, 'shape': (3, 5)} \n"
"F\x00{'descr': '>u2', 'fortran_order': True, 'shape': (5, 3)} \n"
"F\x00{'descr': '>u2', 'fortran_order': False, 'shape': (3, 3)} \n"
"F\x00{'descr': 'i2', 'fortran_order': False, 'shape': (0,)} \n"
"F\x00{'descr': '>i2', 'fortran_order': False, 'shape': ()} \n"
"F\x00{'descr': '>i2', 'fortran_order': False, 'shape': (15,)} \n"
"F\x00{'descr': '>i2', 'fortran_order': False, 'shape': (3, 5)} \n"
"F\x00{'descr': '>i2', 'fortran_order': True, 'shape': (5, 3)} \n"
"F\x00{'descr': '>i2', 'fortran_order': False, 'shape': (3, 3)} \n"
"F\x00{'descr': 'u4', 'fortran_order': False, 'shape': (0,)} \n"
"F\x00{'descr': '>u4', 'fortran_order': False, 'shape': ()} \n"
"F\x00{'descr': '>u4', 'fortran_order': False, 'shape': (15,)} \n"
"F\x00{'descr': '>u4', 'fortran_order': False, 'shape': (3, 5)} \n"
"F\x00{'descr': '>u4', 'fortran_order': True, 'shape': (5, 3)} \n"
"F\x00{'descr': '>u4', 'fortran_order': False, 'shape': (3, 3)} \n"
"F\x00{'descr': 'i4', 'fortran_order': False, 'shape': (0,)} \n"
"F\x00{'descr': '>i4', 'fortran_order': False, 'shape': ()} \n"
"F\x00{'descr': '>i4', 'fortran_order': False, 'shape': (15,)} \n"
"F\x00{'descr': '>i4', 'fortran_order': False, 'shape': (3, 5)} \n"
"F\x00{'descr': '>i4', 'fortran_order': True, 'shape': (5, 3)} \n"
"F\x00{'descr': '>i4', 'fortran_order': False, 'shape': (3, 3)} \n"
"F\x00{'descr': 'u8', 'fortran_order': False, 'shape': (0,)} \n"
"F\x00{'descr': '>u8', 'fortran_order': False, 'shape': ()} \n"
"F\x00{'descr': '>u8', 'fortran_order': False, 'shape': (15,)} \n"
"F\x00{'descr': '>u8', 'fortran_order': False, 'shape': (3, 5)} \n"
"F\x00{'descr': '>u8', 'fortran_order': True, 'shape': (5, 3)} \n"
"F\x00{'descr': '>u8', 'fortran_order': False, 'shape': (3, 3)} \n"
"F\x00{'descr': 'i8', 'fortran_order': False, 'shape': (0,)} \n"
"F\x00{'descr': '>i8', 'fortran_order': False, 'shape': ()} \n"
"F\x00{'descr': '>i8', 'fortran_order': False, 'shape': (15,)} \n"
"F\x00{'descr': '>i8', 'fortran_order': False, 'shape': (3, 5)} \n"
"F\x00{'descr': '>i8', 'fortran_order': True, 'shape': (5, 3)} \n"
"F\x00{'descr': '>i8', 'fortran_order': False, 'shape': (3, 3)} \n"
"F\x00{'descr': 'f4', 'fortran_order': False, 'shape': (0,)} \n"
"F\x00{'descr': '>f4', 'fortran_order': False, 'shape': ()} \n"
"F\x00{'descr': '>f4', 'fortran_order': False, 'shape': (15,)} \n"
"F\x00{'descr': '>f4', 'fortran_order': False, 'shape': (3, 5)} \n"
"F\x00{'descr': '>f4', 'fortran_order': True, 'shape': (5, 3)} \n"
"F\x00{'descr': '>f4', 'fortran_order': False, 'shape': (3, 3)} \n"
"F\x00{'descr': 'f8', 'fortran_order': False, 'shape': (0,)} \n"
"F\x00{'descr': '>f8', 'fortran_order': False, 'shape': ()} \n"
"F\x00{'descr': '>f8', 'fortran_order': False, 'shape': (15,)} \n"
"F\x00{'descr': '>f8', 'fortran_order': False, 'shape': (3, 5)} \n"
"F\x00{'descr': '>f8', 'fortran_order': True, 'shape': (5, 3)} \n"
"F\x00{'descr': '>f8', 'fortran_order': False, 'shape': (3, 3)} \n"
"F\x00{'descr': 'c8', 'fortran_order': False, 'shape': (0,)} \n"
"F\x00{'descr': '>c8', 'fortran_order': False, 'shape': ()} \n"
"F\x00{'descr': '>c8', 'fortran_order': False, 'shape': (15,)} \n"
"F\x00{'descr': '>c8', 'fortran_order': False, 'shape': (3, 5)} \n"
"F\x00{'descr': '>c8', 'fortran_order': True, 'shape': (5, 3)} \n"
"F\x00{'descr': '>c8', 'fortran_order': False, 'shape': (3, 3)} \n"
"F\x00{'descr': 'c16', 'fortran_order': False, 'shape': (0,)} \n"
"F\x00{'descr': '>c16', 'fortran_order': False, 'shape': ()} \n"
"F\x00{'descr': '>c16', 'fortran_order': False, 'shape': (15,)} \n"
"F\x00{'descr': '>c16', 'fortran_order': False, 'shape': (3, 5)} \n"
"F\x00{'descr': '>c16', 'fortran_order': True, 'shape': (5, 3)} \n"
"F\x00{'descr': '>c16', 'fortran_order': False, 'shape': (3, 3)} \n"
"F\x00{'descr': '|O4', 'fortran_order': False, 'shape': (0,)} \n"
"F\x00{'descr': '|O4', 'fortran_order': False, 'shape': ()} \n"
"F\x00{'descr': '|O4', 'fortran_order': False, 'shape': (15,)} \n"
"F\x00{'descr': '|O4', 'fortran_order': False, 'shape': (3, 5)} \n"
"F\x00{'descr': '|O4', 'fortran_order': True, 'shape': (5, 3)} \n"
"F\x00{'descr': '|O4', 'fortran_order': False, 'shape': (3, 3)} \n"
"F\x00{'descr': '|O4', 'fortran_order': False, 'shape': (0,)} \n"
"F\x00{'descr': '|O4', 'fortran_order': False, 'shape': ()} \n"
"F\x00{'descr': '|O4', 'fortran_order': False, 'shape': (15,)} \n"
"F\x00{'descr': '|O4', 'fortran_order': False, 'shape': (3, 5)} \n"
"F\x00{'descr': '|O4', 'fortran_order': True, 'shape': (5, 3)} \n"
"F\x00{'descr': '|O4', 'fortran_order': False, 'shape': (3, 3)} \n"
"v\x00{'descr': [('x', 'i4', (2,)), ('y', '>f8', (2, 2)), ('z', '|u1')],\n 'fortran_order': False,\n 'shape': (2,)} \n"
"\x16\x02{'descr': [('x', '>i4', (2,)),\n ('Info',\n [('value', '>c16'),\n ('y2', '>f8'),\n ('Info2',\n [('name', '|S2'),\n ('value', '>c16', (2,)),\n ('y3', '>f8', (2,)),\n ('z3', '>u4', (2,))]),\n ('name', '|S2'),\n ('z2', '|b1')]),\n ('color', '|S2'),\n ('info', [('Name', '>U8'), ('Value', '>c16')]),\n ('y', '>f8', (2, 2)),\n ('z', '|u1')],\n 'fortran_order': False,\n 'shape': (2,)} \n"
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