Python format.write_array方法代码示例

# 需要导入模块: from numpy.lib import format [as 别名]
# 或者: from numpy.lib.format import write_array [as 别名]
def test_version_2_0():
    f = BytesIO()
    # requires more than 2 byte for header
    dt = [(("%d" % i) * 100, float) for i in range(500)]
    d = np.ones(1000, dtype=dt)

    format.write_array(f, d, version=(2, 0))
    with warnings.catch_warnings(record=True) as w:
        warnings.filterwarnings('always', '', UserWarning)
        format.write_array(f, d)
        assert_(w[0].category is UserWarning)

    # check alignment of data portion
    f.seek(0)
    header = f.readline()
    assert_(len(header) % format.ARRAY_ALIGN == 0)

    f.seek(0)
    n = format.read_array(f)
    assert_array_equal(d, n)

    # 1.0 requested but data cannot be saved this way
    assert_raises(ValueError, format.write_array, f, d, (1, 0)) 

# 需要导入模块: from numpy.lib import format [as 别名]
# 或者: from numpy.lib.format import write_array [as 别名]
def test_read_magic():
    s1 = BytesIO()
    s2 = BytesIO()

    arr = np.ones((3, 6), dtype=float)

    format.write_array(s1, arr, version=(1, 0))
    format.write_array(s2, arr, version=(2, 0))

    s1.seek(0)
    s2.seek(0)

    version1 = format.read_magic(s1)
    version2 = format.read_magic(s2)

    assert_(version1 == (1, 0))
    assert_(version2 == (2, 0))

    assert_(s1.tell() == format.MAGIC_LEN)
    assert_(s2.tell() == format.MAGIC_LEN) 

# 需要导入模块: from numpy.lib import format [as 别名]
# 或者: from numpy.lib.format import write_array [as 别名]
def test_version_2_0():
    f = BytesIO()
    # requires more than 2 byte for header
    dt = [(("%d" % i) * 100, float) for i in range(500)]
    d = np.ones(1000, dtype=dt)

    format.write_array(f, d, version=(2, 0))
    with warnings.catch_warnings(record=True) as w:
        warnings.filterwarnings('always', '', UserWarning)
        format.write_array(f, d)
        assert_(w[0].category is UserWarning)

    f.seek(0)
    n = format.read_array(f)
    assert_array_equal(d, n)

    # 1.0 requested but data cannot be saved this way
    assert_raises(ValueError, format.write_array, f, d, (1, 0)) 

# 需要导入模块: from numpy.lib import format [as 别名]
# 或者: from numpy.lib.format import write_array [as 别名]
def test_write_version_1_0():
    f = BytesIO()
    arr = np.arange(1)
    # These should pass.
    format.write_array(f, arr, version=(1, 0))
    format.write_array(f, arr)

    # These should all fail.
    bad_versions = [
        (1, 1),
        (0, 0),
        (0, 1),
        (2, 0),
        (2, 2),
        (255, 255),
    ]
    for version in bad_versions:
        try:
            format.write_array(f, arr, version=version)
        except ValueError:
            pass
        else:
            raise AssertionError("we should have raised a ValueError for the bad version %r" % (version,)) 

# 需要导入模块: from numpy.lib import format [as 别名]
# 或者: from numpy.lib.format import write_array [as 别名]
def roundtrip(arr):
    f = BytesIO()
    format.write_array(f, arr)
    f2 = BytesIO(f.getvalue())
    arr2 = format.read_array(f2)
    return arr2 

# 需要导入模块: from numpy.lib import format [as 别名]
# 或者: from numpy.lib.format import write_array [as 别名]
def roundtrip_randsize(arr):
    f = BytesIO()
    format.write_array(f, arr)
    f2 = BytesIOSRandomSize(f.getvalue())
    arr2 = format.read_array(f2)
    return arr2 

# 需要导入模块: from numpy.lib import format [as 别名]
# 或者: from numpy.lib.format import write_array [as 别名]
def roundtrip_truncated(arr):
    f = BytesIO()
    format.write_array(f, arr)
    #BytesIO is one byte short
    f2 = BytesIO(f.getvalue()[0:-1])
    arr2 = format.read_array(f2)
    return arr2 

# 需要导入模块: from numpy.lib import format [as 别名]
# 或者: from numpy.lib.format import write_array [as 别名]
def test_memmap_roundtrip():
    # Fixme: used to crash on windows
    if not (sys.platform == 'win32' or sys.platform == 'cygwin'):
        for arr in basic_arrays + record_arrays:
            if arr.dtype.hasobject:
                # Skip these since they can't be mmap'ed.
                continue
            # Write it out normally and through mmap.
            nfn = os.path.join(tempdir, 'normal.npy')
            mfn = os.path.join(tempdir, 'memmap.npy')
            fp = open(nfn, 'wb')
            try:
                format.write_array(fp, arr)
            finally:
                fp.close()

            fortran_order = (
                arr.flags.f_contiguous and not arr.flags.c_contiguous)
            ma = format.open_memmap(mfn, mode='w+', dtype=arr.dtype,
                                    shape=arr.shape, fortran_order=fortran_order)
            ma[...] = arr
            del ma

            # Check that both of these files' contents are the same.
            fp = open(nfn, 'rb')
            normal_bytes = fp.read()
            fp.close()
            fp = open(mfn, 'rb')
            memmap_bytes = fp.read()
            fp.close()
            assert_equal_(normal_bytes, memmap_bytes)

            # Check that reading the file using memmap works.
            ma = format.open_memmap(nfn, mode='r')
            del ma 

# 需要导入模块: from numpy.lib import format [as 别名]
# 或者: from numpy.lib.format import write_array [as 别名]
def test_read_array_header_1_0():
    s = BytesIO()

    arr = np.ones((3, 6), dtype=float)
    format.write_array(s, arr, version=(1, 0))

    s.seek(format.MAGIC_LEN)
    shape, fortran, dtype = format.read_array_header_1_0(s)

    assert_(s.tell() % format.ARRAY_ALIGN == 0)
    assert_((shape, fortran, dtype) == ((3, 6), False, float)) 

# 需要导入模块: from numpy.lib import format [as 别名]
# 或者: from numpy.lib.format import write_array [as 别名]
def test_read_array_header_2_0():
    s = BytesIO()

    arr = np.ones((3, 6), dtype=float)
    format.write_array(s, arr, version=(2, 0))

    s.seek(format.MAGIC_LEN)
    shape, fortran, dtype = format.read_array_header_2_0(s)

    assert_(s.tell() % format.ARRAY_ALIGN == 0)
    assert_((shape, fortran, dtype) == ((3, 6), False, float)) 

# 需要导入模块: from numpy.lib import format [as 别名]
# 或者: from numpy.lib.format import write_array [as 别名]
def test_memmap_roundtrip():
    # Fixme: test crashes nose on windows.
    if not (sys.platform == 'win32' or sys.platform == 'cygwin'):
        for arr in basic_arrays + record_arrays:
            if arr.dtype.hasobject:
                # Skip these since they can't be mmap'ed.
                continue
            # Write it out normally and through mmap.
            nfn = os.path.join(tempdir, 'normal.npy')
            mfn = os.path.join(tempdir, 'memmap.npy')
            fp = open(nfn, 'wb')
            try:
                format.write_array(fp, arr)
            finally:
                fp.close()

            fortran_order = (
                arr.flags.f_contiguous and not arr.flags.c_contiguous)
            ma = format.open_memmap(mfn, mode='w+', dtype=arr.dtype,
                                    shape=arr.shape, fortran_order=fortran_order)
            ma[...] = arr
            del ma

            # Check that both of these files' contents are the same.
            fp = open(nfn, 'rb')
            normal_bytes = fp.read()
            fp.close()
            fp = open(mfn, 'rb')
            memmap_bytes = fp.read()
            fp.close()
            yield assert_equal_, normal_bytes, memmap_bytes

            # Check that reading the file using memmap works.
            ma = format.open_memmap(nfn, mode='r')
            del ma