Python utils.safe_eval方法代碼示例

# 需要導入模塊: from numpy.lib import utils [as 別名]
# 或者: from numpy.lib.utils import safe_eval [as 別名]
def test_safe_eval_nameconstant():
    # Test if safe_eval supports Python 3.4 _ast.NameConstant
    utils.safe_eval('None') 

# 需要導入模塊: from numpy.lib import utils [as 別名]
# 或者: from numpy.lib.utils import safe_eval [as 別名]
def _read_array_header(fp, version):
    """
    see read_array_header_1_0
    """
    # Read an unsigned, little-endian short int which has the length of the
    # header.
    import struct
    if version == (1, 0):
        hlength_type = '<H'
    elif version == (2, 0):
        hlength_type = '<I'
    else:
        raise ValueError("Invalid version %r" % version)

    hlength_str = _read_bytes(fp, struct.calcsize(hlength_type), "array header length")
    header_length = struct.unpack(hlength_type, hlength_str)[0]
    header = _read_bytes(fp, header_length, "array header")

    # The header is a pretty-printed string representation of a literal
    # Python dictionary with trailing newlines padded to a ARRAY_ALIGN byte
    # boundary. The keys are strings.
    #   "shape" : tuple of int
    #   "fortran_order" : bool
    #   "descr" : dtype.descr
    header = _filter_header(header)
    try:
        d = safe_eval(header)
    except SyntaxError as e:
        msg = "Cannot parse header: %r\nException: %r"
        raise ValueError(msg % (header, e))
    if not isinstance(d, dict):
        msg = "Header is not a dictionary: %r"
        raise ValueError(msg % d)
    keys = sorted(d.keys())
    if keys != ['descr', 'fortran_order', 'shape']:
        msg = "Header does not contain the correct keys: %r"
        raise ValueError(msg % (keys,))

    # Sanity-check the values.
    if (not isinstance(d['shape'], tuple) or
            not numpy.all([isinstance(x, (int, long)) for x in d['shape']])):
        msg = "shape is not valid: %r"
        raise ValueError(msg % (d['shape'],))
    if not isinstance(d['fortran_order'], bool):
        msg = "fortran_order is not a valid bool: %r"
        raise ValueError(msg % (d['fortran_order'],))
    try:
        dtype = descr_to_dtype(d['descr'])
    except TypeError as e:
        msg = "descr is not a valid dtype descriptor: %r"
        raise ValueError(msg % (d['descr'],))

    return d['shape'], d['fortran_order'], dtype 

# 需要導入模塊: from numpy.lib import utils [as 別名]
# 或者: from numpy.lib.utils import safe_eval [as 別名]
def _read_array_header(fp, version):
    """
    see read_array_header_1_0
    """
    # Read an unsigned, little-endian short int which has the length of the
    # header.
    import struct
    if version == (1, 0):
        hlength_type = '<H'
    elif version == (2, 0):
        hlength_type = '<I'
    else:
        raise ValueError("Invalid version %r" % version)

    hlength_str = _read_bytes(fp, struct.calcsize(hlength_type), "array header length")
    header_length = struct.unpack(hlength_type, hlength_str)[0]
    header = _read_bytes(fp, header_length, "array header")

    # The header is a pretty-printed string representation of a literal
    # Python dictionary with trailing newlines padded to a ARRAY_ALIGN byte
    # boundary. The keys are strings.
    #   "shape" : tuple of int
    #   "fortran_order" : bool
    #   "descr" : dtype.descr
    header = _filter_header(header)
    try:
        d = safe_eval(header)
    except SyntaxError as e:
        msg = "Cannot parse header: %r\nException: %r"
        raise ValueError(msg % (header, e))
    if not isinstance(d, dict):
        msg = "Header is not a dictionary: %r"
        raise ValueError(msg % d)
    keys = sorted(d.keys())
    if keys != ['descr', 'fortran_order', 'shape']:
        msg = "Header does not contain the correct keys: %r"
        raise ValueError(msg % (keys,))

    # Sanity-check the values.
    if (not isinstance(d['shape'], tuple) or
            not numpy.all([isinstance(x, (int, long)) for x in d['shape']])):
        msg = "shape is not valid: %r"
        raise ValueError(msg % (d['shape'],))
    if not isinstance(d['fortran_order'], bool):
        msg = "fortran_order is not a valid bool: %r"
        raise ValueError(msg % (d['fortran_order'],))
    try:
        dtype = numpy.dtype(d['descr'])
    except TypeError as e:
        msg = "descr is not a valid dtype descriptor: %r"
        raise ValueError(msg % (d['descr'],))

    return d['shape'], d['fortran_order'], dtype 

# 需要導入模塊: from numpy.lib import utils [as 別名]
# 或者: from numpy.lib.utils import safe_eval [as 別名]
def _read_array_header(fp, version):
    """
    see read_array_header_1_0
    """
    # Read an unsigned, little-endian short int which has the length of the
    # header.
    import struct
    if version == (1, 0):
        hlength_str = _read_bytes(fp, 2, "array header length")
        header_length = struct.unpack('<H', hlength_str)[0]
        header = _read_bytes(fp, header_length, "array header")
    elif version == (2, 0):
        hlength_str = _read_bytes(fp, 4, "array header length")
        header_length = struct.unpack('<I', hlength_str)[0]
        header = _read_bytes(fp, header_length, "array header")
    else:
        raise ValueError("Invalid version %r" % version)

    # The header is a pretty-printed string representation of a literal
    # Python dictionary with trailing newlines padded to a 16-byte
    # boundary. The keys are strings.
    #   "shape" : tuple of int
    #   "fortran_order" : bool
    #   "descr" : dtype.descr
    header = _filter_header(header)
    try:
        d = safe_eval(header)
    except SyntaxError as e:
        msg = "Cannot parse header: %r\nException: %r"
        raise ValueError(msg % (header, e))
    if not isinstance(d, dict):
        msg = "Header is not a dictionary: %r"
        raise ValueError(msg % d)
    keys = sorted(d.keys())
    if keys != ['descr', 'fortran_order', 'shape']:
        msg = "Header does not contain the correct keys: %r"
        raise ValueError(msg % (keys,))

    # Sanity-check the values.
    if (not isinstance(d['shape'], tuple) or
            not numpy.all([isinstance(x, (int, long)) for x in d['shape']])):
        msg = "shape is not valid: %r"
        raise ValueError(msg % (d['shape'],))
    if not isinstance(d['fortran_order'], bool):
        msg = "fortran_order is not a valid bool: %r"
        raise ValueError(msg % (d['fortran_order'],))
    try:
        dtype = numpy.dtype(d['descr'])
    except TypeError as e:
        msg = "descr is not a valid dtype descriptor: %r"
        raise ValueError(msg % (d['descr'],))

    return d['shape'], d['fortran_order'], dtype 

# 需要導入模塊: from numpy.lib import utils [as 別名]
# 或者: from numpy.lib.utils import safe_eval [as 別名]
def _read_array_header(fp, version):
    """
    see read_array_header_1_0
    """
    # Read an unsigned, little-endian short int which has the length of the
    # header.
    import struct
    if version == (1, 0):
        hlength_type = '<H'
    elif version == (2, 0):
        hlength_type = '<I'
    else:
        raise ValueError("Invalid version {!r}".format(version))

    hlength_str = _read_bytes(fp, struct.calcsize(hlength_type), "array header length")
    header_length = struct.unpack(hlength_type, hlength_str)[0]
    header = _read_bytes(fp, header_length, "array header")

    # The header is a pretty-printed string representation of a literal
    # Python dictionary with trailing newlines padded to a ARRAY_ALIGN byte
    # boundary. The keys are strings.
    #   "shape" : tuple of int
    #   "fortran_order" : bool
    #   "descr" : dtype.descr
    header = _filter_header(header)
    try:
        d = safe_eval(header)
    except SyntaxError as e:
        msg = "Cannot parse header: {!r}\nException: {!r}"
        raise ValueError(msg.format(header, e))
    if not isinstance(d, dict):
        msg = "Header is not a dictionary: {!r}"
        raise ValueError(msg.format(d))
    keys = sorted(d.keys())
    if keys != ['descr', 'fortran_order', 'shape']:
        msg = "Header does not contain the correct keys: {!r}"
        raise ValueError(msg.format(keys))

    # Sanity-check the values.
    if (not isinstance(d['shape'], tuple) or
            not numpy.all([isinstance(x, (int, long)) for x in d['shape']])):
        msg = "shape is not valid: {!r}"
        raise ValueError(msg.format(d['shape']))
    if not isinstance(d['fortran_order'], bool):
        msg = "fortran_order is not a valid bool: {!r}"
        raise ValueError(msg.format(d['fortran_order']))
    try:
        dtype = descr_to_dtype(d['descr'])
    except TypeError as e:
        msg = "descr is not a valid dtype descriptor: {!r}"
        raise ValueError(msg.format(d['descr']))

    return d['shape'], d['fortran_order'], dtype