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Set up: >>> import sys >>> from io import BytesIO >>> 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(BytesIO(format.magic(1, 0))) (1, 0) >>> format.read_magic(BytesIO(format.magic(0, 0))) (0, 0) >>> format.read_magic(BytesIO(format.magic(255, 255))) (255, 255) >>> format.read_magic(BytesIO(format.magic(2, 5))) (2, 5) Test the header writing. >>> for arr in basic_arrays + record_arrays: ... f = BytesIO() ... format.write_array_header_1_0(f, arr) # XXX: arr is not a dict, items gets called on it ... 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': '>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': '>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': '>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': '>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': '>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': '>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': '>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': '>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': '>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': '>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': 'O', 'fortran_order': False, 'shape': (0,)} \n" "F\x00{'descr': 'O', 'fortran_order': False, 'shape': ()} \n" "F\x00{'descr': 'O', 'fortran_order': False, 'shape': (15,)} \n" "F\x00{'descr': 'O', 'fortran_order': False, 'shape': (3, 5)} \n" "F\x00{'descr': 'O', 'fortran_order': True, 'shape': (5, 3)} \n" "F\x00{'descr': 'O', 'fortran_order': False, 'shape': (3, 3)} \n" "F\x00{'descr': 'O', 'fortran_order': False, 'shape': (0,)} \n" "F\x00{'descr': 'O', 'fortran_order': False, 'shape': ()} \n" "F\x00{'descr': 'O', 'fortran_order': False, 'shape': (15,)} \n" "F\x00{'descr': 'O', 'fortran_order': False, 'shape': (3, 5)} \n" "F\x00{'descr': 'O', 'fortran_order': True, 'shape': (5, 3)} \n" "F\x00{'descr': 'O', '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" "v\x00{'descr': [('x', '>i4', (2,)), ('y', '>f8', (2, 2)), ('z', '|u1')],\n 'fortran_order': 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