How to use the segyio._segyio.init_metrics function in segyio

def test_metrics(self):
        f = _segyio.open(self.filename, "r")
        binary_header = _segyio.read_binaryheader(f)
        ilb = 189
        xlb = 193

        with self.assertRaises(TypeError):
            metrics = _segyio.init_metrics("?", binary_header, ilb, xlb)

        with self.assertRaises(TypeError):
            metrics = _segyio.init_metrics(f, "?", ilb, xlb)

        with self.assertRaises(IndexError):
            metrics = _segyio.init_metrics(f, binary_header, ilb + 1, xlb)

        metrics = _segyio.init_metrics(f, binary_header, ilb, xlb)

        self.assertEqual(metrics['iline_field'], ilb)
        self.assertEqual(metrics['xline_field'], xlb)
        self.assertEqual(metrics['trace0'], _segyio.textheader_size() + _segyio.binheader_size())
        self.assertEqual(metrics['sample_count'], 50)
        self.assertEqual(metrics['format'], 1)
        self.assertEqual(metrics['trace_bsize'], 200)
        self.assertEqual(metrics['sorting'], 2) # inline sorting = 2, crossline sorting = 1
        self.assertEqual(metrics['trace_count'], 25)
        self.assertEqual(metrics['offset_count'], 1)
        self.assertEqual(metrics['iline_count'], 5)
        self.assertEqual(metrics['xline_count'], 5)

        _segyio.close(f)

        with self.assertRaises(IOError):

def test_metrics(self):
        f = _segyio.open(self.filename, "r")
        binary_header = _segyio.read_binaryheader(f)
        ilb = 189
        xlb = 193

        with self.assertRaises(TypeError):
            metrics = _segyio.init_metrics("?", binary_header, ilb, xlb)

        with self.assertRaises(TypeError):
            metrics = _segyio.init_metrics(f, "?", ilb, xlb)

        with self.assertRaises(IndexError):
            metrics = _segyio.init_metrics(f, binary_header, ilb + 1, xlb)

        metrics = _segyio.init_metrics(f, binary_header, ilb, xlb)

        self.assertEqual(metrics['iline_field'], ilb)
        self.assertEqual(metrics['xline_field'], xlb)
        self.assertEqual(metrics['trace0'], _segyio.textheader_size() + _segyio.binheader_size())
        self.assertEqual(metrics['sample_count'], 50)
        self.assertEqual(metrics['format'], 1)
        self.assertEqual(metrics['trace_bsize'], 200)
        self.assertEqual(metrics['sorting'], 2) # inline sorting = 2, crossline sorting = 1
        self.assertEqual(metrics['trace_count'], 25)
        self.assertEqual(metrics['offset_count'], 1)
        self.assertEqual(metrics['iline_count'], 5)

def test_metrics(self):
        f = _segyio.open(self.filename, "r")
        binary_header = _segyio.read_binaryheader(f)
        ilb = 189
        xlb = 193

        with self.assertRaises(TypeError):
            metrics = _segyio.init_metrics("?", binary_header, ilb, xlb)

        with self.assertRaises(TypeError):
            metrics = _segyio.init_metrics(f, "?", ilb, xlb)

        with self.assertRaises(IndexError):
            metrics = _segyio.init_metrics(f, binary_header, ilb + 1, xlb)

        metrics = _segyio.init_metrics(f, binary_header, ilb, xlb)

        self.assertEqual(metrics['iline_field'], ilb)
        self.assertEqual(metrics['xline_field'], xlb)
        self.assertEqual(metrics['trace0'], _segyio.textheader_size() + _segyio.binheader_size())
        self.assertEqual(metrics['sample_count'], 50)
        self.assertEqual(metrics['format'], 1)
        self.assertEqual(metrics['trace_bsize'], 200)
        self.assertEqual(metrics['sorting'], 2) # inline sorting = 2, crossline sorting = 1
        self.assertEqual(metrics['trace_count'], 25)
        self.assertEqual(metrics['offset_count'], 1)
        self.assertEqual(metrics['iline_count'], 5)
        self.assertEqual(metrics['xline_count'], 5)

        _segyio.close(f)

def test_line_metrics(self):
        f = _segyio.open(self.filename, "r")

        binary_header = _segyio.read_binaryheader(f)
        ilb = 189
        xlb = 193
        metrics = _segyio.init_metrics(f, binary_header, ilb, xlb)
        _segyio.close(f)

        sorting = metrics['sorting']
        trace_count = metrics['trace_count']
        inline_count = metrics['iline_count']
        crossline_count = metrics['xline_count']
        offset_count = metrics['offset_count']

        metrics = _segyio.init_line_metrics(sorting, trace_count, inline_count, crossline_count, offset_count)

        self.assertEqual(metrics['xline_length'], 5)
        self.assertEqual(metrics['xline_stride'], 5)
        self.assertEqual(metrics['iline_length'], 5)
        self.assertEqual(metrics['iline_stride'], 1)

        # (sorting, trace_count, inline_count, crossline_count, offset_count)

def test_metrics(self):
        f = _segyio.open(self.filename, "r")
        binary_header = _segyio.read_binaryheader(f)
        ilb = 189
        xlb = 193

        with self.assertRaises(TypeError):
            metrics = _segyio.init_metrics("?", binary_header, ilb, xlb)

        with self.assertRaises(TypeError):
            metrics = _segyio.init_metrics(f, "?", ilb, xlb)

        with self.assertRaises(IndexError):
            metrics = _segyio.init_metrics(f, binary_header, ilb + 1, xlb)

        metrics = _segyio.init_metrics(f, binary_header, ilb, xlb)

        self.assertEqual(metrics['iline_field'], ilb)
        self.assertEqual(metrics['xline_field'], xlb)
        self.assertEqual(metrics['trace0'], _segyio.textheader_size() + _segyio.binheader_size())
        self.assertEqual(metrics['sample_count'], 50)
        self.assertEqual(metrics['format'], 1)
        self.assertEqual(metrics['trace_bsize'], 200)
        self.assertEqual(metrics['sorting'], 2) # inline sorting = 2, crossline sorting = 1

self.assertEqual(metrics['iline_field'], ilb)
        self.assertEqual(metrics['xline_field'], xlb)
        self.assertEqual(metrics['trace0'], _segyio.textheader_size() + _segyio.binheader_size())
        self.assertEqual(metrics['sample_count'], 50)
        self.assertEqual(metrics['format'], 1)
        self.assertEqual(metrics['trace_bsize'], 200)
        self.assertEqual(metrics['sorting'], 2) # inline sorting = 2, crossline sorting = 1
        self.assertEqual(metrics['trace_count'], 25)
        self.assertEqual(metrics['offset_count'], 1)
        self.assertEqual(metrics['iline_count'], 5)
        self.assertEqual(metrics['xline_count'], 5)

        _segyio.close(f)

        with self.assertRaises(IOError):
            metrics = _segyio.init_metrics(f, binary_header, ilb, xlb)

def test_fread_trace0(self):
        f = _segyio.open(self.filename, "r")

        binary_header = _segyio.read_binaryheader(f)
        ilb = 189
        xlb = 193

        metrics = _segyio.init_metrics(f, binary_header, ilb, xlb)

        sorting = metrics['sorting']
        trace_count = metrics['trace_count']
        inline_count = metrics['iline_count']
        crossline_count = metrics['xline_count']
        offset_count = metrics['offset_count']

        line_metrics = _segyio.init_line_metrics(sorting, trace_count, inline_count, crossline_count, offset_count)

        iline_indexes = numpy.zeros(metrics['iline_count'], dtype=numpy.uintc)
        xline_indexes = numpy.zeros(metrics['xline_count'], dtype=numpy.uintc)
        offsets       = numpy.zeros(metrics['offset_count'], dtype=numpy.uintc)
        _segyio.init_indices(f, metrics, iline_indexes, xline_indexes, offsets)

        with self.assertRaises(KeyError):
            _segyio.fread_trace0(0, len(xline_indexes), line_metrics['iline_stride'], offset_count, iline_indexes, "inline")