本文整理汇总了Python中numpy.lib.utils.safe_eval方法的典型用法代码示例。如果您正苦于以下问题：Python utils.safe_eval方法的具体用法？Python utils.safe_eval怎么用？Python utils.safe_eval使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类numpy.lib.utils的用法示例。
在下文中一共展示了utils.safe_eval方法的5个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: test_safe_eval_nameconstant
# 需要导入模块: from numpy.lib import utils [as 别名]
# 或者: from numpy.lib.utils import safe_eval [as 别名]
def test_safe_eval_nameconstant():
# Test if safe_eval supports Python 3.4 _ast.NameConstant
utils.safe_eval('None') 示例2: _read_array_header
# 需要导入模块: from numpy.lib import utils [as 别名]
# 或者: from numpy.lib.utils import safe_eval [as 别名]
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 示例3: _read_array_header
# 需要导入模块: from numpy.lib import utils [as 别名]
# 或者: from numpy.lib.utils import safe_eval [as 别名]
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 示例4: _read_array_header
# 需要导入模块: from numpy.lib import utils [as 别名]
# 或者: from numpy.lib.utils import safe_eval [as 别名]
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 示例5: _read_array_header
# 需要导入模块: from numpy.lib import utils [as 别名]
# 或者: from numpy.lib.utils import safe_eval [as 别名]
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