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propertiesdata.py
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propertiesdata.py
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import logging
from ..data import Data
from ..decorators import (
_display_or_return,
_inplace_enabled,
_inplace_enabled_define_and_cleanup,
_manage_log_level_via_verbosity,
_test_decorator_args,
)
from . import Properties
logger = logging.getLogger(__name__)
class PropertiesData(Properties):
"""Mixin class for a data array with descriptive properties.
.. versionadded:: (cfdm) 1.7.0
"""
def __new__(cls, *args, **kwargs):
"""Store component classes."""
instance = super().__new__(cls)
instance._Data = Data
return instance
def __getitem__(self, indices):
"""Return a subspace defined by indices.
f.__getitem__(indices) <==> f[indices]
Indexing follows rules that are very similar to the numpy
indexing rules, the only differences being:
* An integer index i takes the i-th element but does not
reduce the rank by one.
* When two or more dimensions' indices are sequences of
integers then these indices work independently along each
dimension (similar to the way vector subscripts work in
Fortran). This is the same behaviour as indexing on a
Variable object of the netCDF4 package.
.. versionadded:: (cfdm) 1.7.0
:Returns:
The subspace.
**Examples**
>>> f.shape
(1, 10, 9)
>>> f[:, :, 1].shape
(1, 10, 1)
>>> f[:, 0].shape
(1, 1, 9)
>>> f[..., 6:3:-1, 3:6].shape
(1, 3, 3)
>>> f[0, [2, 9], [4, 8]].shape
(1, 2, 2)
>>> f[0, :, -2].shape
(1, 10, 1)
"""
new = self.copy()
data = self.get_data(None, _fill_value=False)
if data is not None:
new.set_data(data[indices], copy=False)
if 0 in new.shape:
raise IndexError(
f"Indices {indices!r} result in a subspaced shape of "
f"{new.shape}, but can't create a subspace of "
f"{self.__class__.__name__} that has a size 0 axis"
)
return new
def __str__(self):
"""Called by the `str` built-in function.
x.__str__() <==> str(x)
.. versionadded:: (cfdm) 1.7.0
"""
data = self.get_data(None, _units=False, _fill_value=False)
if data is not None:
dims = ", ".join([str(x) for x in data.shape])
dims = f"({dims})"
else:
dims = ""
# Units
units = self.get_property("units", "")
if units is None:
isreftime = bool(self.get_property("calendar", False))
else:
isreftime = "since" in units
if isreftime:
units += " " + self.get_property("calendar", "")
return f"{self.identity('')}{dims} {units}"
def _parse_axes(self, axes):
"""Conform axes.
:Parameters:
axes: (sequence of) `int`
{{axes int examples}}
:Returns:
`list`
The conformed axes.
"""
if axes is None:
return axes
if isinstance(axes, int):
axes = (axes,)
ndim = self.ndim
return [(i + ndim if i < 0 else i) for i in axes]
@classmethod
def _test_docstring_substitution_classmethod(cls, arg1, arg2):
"""Test docstring substitution on with @classmethod.
{{inplace: `bool`, optional}}
{{package}}.{{class}}
"""
return (arg1, arg2)
@staticmethod
def _test_docstring_substitution_staticmethod(arg1, arg2):
"""Test docstring substitution on with @staticmethod.
{{inplace: `bool`, optional}}
{{package}}.{{class}}
"""
return (arg1, arg2)
def _test_docstring_substitution_3(self, arg1, arg2):
"""Test docstring substitution 3.
{{inplace: `bool`, optional}}
{{package}}.{{class}}
"""
return self.__class__._test_docstring_substitution_staticmethod(
arg1, arg2
)
def _test_docstring_substitution_4(self, arg1, arg2):
"""Test docstring substitution 4.
{{inplace: `bool`, optional}}
{{package}}.{{class}}
"""
return self._test_docstring_substitution_classmethod(arg1, arg2)
@_test_decorator_args("i")
@_inplace_enabled(default=False)
def _test_docstring_substitution(self, inplace=False, verbose=None):
"""Test docstring substitution with two decorators.
{{inplace: `bool`, optional}}
{{package}}.{{class}}
"""
print("In _test_docstring_substitution")
@property
def array(self):
"""A numpy array deep copy of the data.
Changing the returned numpy array does not change the data
array.
.. versionadded:: 1.10.0.0
.. seealso:: `data`, `datetime_array`
**Examples**
>>> f.data
<{{repr}}Data(5): [0, ... 4] kg m-1 s-2>
>>> a = f.array
>>> type(a)
<type 'numpy.ndarray'>
>>> print(a)
[0 1 2 3 4]
>>> a[0] = 999
>>> print(a)
[999 1 2 3 4]
>>> print(f.array)
[0 1 2 3 4]
>>> f.data
<{{repr}}Data(5): [0, ... 4] kg m-1 s-2>
"""
data = self.get_data(None)
if data is None:
raise AttributeError(f"{self.__class__.__name__} has no data")
return data.array
@property
def datetime_array(self):
"""An independent numpy array of date-time objects.
Only applicable for data with reference time units.
If the calendar has not been set then the CF default calendar
will be used and the units will be updated accordingly.
.. versionadded:: 1.10.0.0
.. seealso:: `array`, `data`
**Examples**
>>> f.units
'days since 2000-01-01'
>>> print(f.array)
[ 0 31 60 91]
>>> print(f.datetime_array)
[cftime.DatetimeGregorian(2000-01-01 00:00:00)
cftime.DatetimeGregorian(2000-02-01 00:00:00)
cftime.DatetimeGregorian(2000-03-01 00:00:00)
cftime.DatetimeGregorian(2000-04-01 00:00:00)]
"""
data = self.get_data(None)
if data is None:
raise AttributeError(f"{self.__class__.__name__} has no data")
return data.datetime_array
@property
def dtype(self):
"""Data-type of the data elements.
**Examples**
>>> d.dtype
dtype('float64')
>>> type(d.dtype)
<type 'numpy.dtype'>
"""
data = self.get_data(None, _units=False, _fill_value=False)
if data is not None:
return data.dtype
raise AttributeError(
f"{self.__class__.__name__} object has no attribute 'dtype'"
)
@property
def ndim(self):
"""The number of dimensions in the data array.
.. seealso:: `data`, `has_data`, `isscalar`, `shape`, `size`
**Examples**
>>> f.shape
(73, 96)
>>> f.ndim
2
>>> f.size
7008
>>> f.shape
(73, 1, 96)
>>> f.ndim
3
>>> f.size
7008
>>> f.shape
(73,)
>>> f.ndim
1
>>> f.size
73
>>> f.shape
()
>>> f.ndim
0
>>> f.size
1
"""
data = self.get_data(None, _units=False, _fill_value=False)
if data is not None:
return data.ndim
raise AttributeError(
f"{self.__class__.__name__} object has no attribute 'ndim'"
)
@property
def shape(self):
"""A tuple of the data array's dimension sizes.
.. seealso:: `data`, `has_data`, `ndim`, `size`
**Examples**
>>> f.shape
(73, 96)
>>> f.ndim
2
>>> f.size
7008
>>> f.shape
(73, 1, 96)
>>> f.ndim
3
>>> f.size
7008
>>> f.shape
(73,)
>>> f.ndim
1
>>> f.size
73
>>> f.shape
()
>>> f.ndim
0
>>> f.size
1
"""
data = self.get_data(None, _units=False, _fill_value=False)
if data is not None:
return data.shape
raise AttributeError(
f"{self.__class__.__name__} object has no attribute 'shape'"
)
@property
def size(self):
"""The number of elements in the data array.
.. seealso:: `data`, `has_data`, `ndim`, `shape`
**Examples**
>>> f.shape
(73, 96)
>>> f.ndim
2
>>> f.size
7008
>>> f.shape
(73, 1, 96)
>>> f.ndim
3
>>> f.size
7008
>>> f.shape
(73,)
>>> f.ndim
1
>>> f.size
73
>>> f.shape
()
>>> f.ndim
0
>>> f.size
1
"""
data = self.get_data(None, _units=False, _fill_value=False)
if data is not None:
return data.size
raise AttributeError(
f"{self.__class__.__name__} object has no attribute 'size'"
)
# ----------------------------------------------------------------
# Methods
# ----------------------------------------------------------------
@_inplace_enabled(default=False)
def apply_masking(self, inplace=False):
"""Apply masking as defined by the CF conventions.
Masking is applied according to any of the following criteria that
are applicable:
* where data elements are equal to the value of the
``missing_value`` property;
* where data elements are equal to the value of the ``_FillValue``
property;
* where data elements are strictly less than the value of the
``valid_min`` property;
* where data elements are strictly greater than the value of the
``valid_max`` property;
* where data elements are within the inclusive range specified by
the two values of ``valid_range`` property.
If any of the above properties have not been set the no masking is
applied for that method.
Elements that are already masked remain so.
.. note:: If using the `apply_masking` method on a construct
that has been read from a dataset with the
``mask=False`` parameter to the `read` function,
then the mask defined in the dataset can only be
recreated if the ``missing_value``, ``_FillValue``,
``valid_min``, ``valid_max``, and ``valid_range``
properties have not been updated.
.. versionadded:: (cfdm) 1.8.2
.. seealso:: `Data.apply_masking`, `read`, `write`
:Parameters:
{{inplace: `bool`, optional}}
:Returns:
A new instance with masked values, or `None` if the
operation was in-place.
**Examples**
>>> print(v.data.array)
[9.96920997e+36, 9.96920997e+36, 9.96920997e+36, 9.96920997e+36,
9.96920997e+36, 9.96920997e+36, 9.96920997e+36, 9.96920997e+36],
[0.023 0.036 0.045 0.062 0.046 0.073 0.006 0.066]
[0.11 0.131 0.124 0.146 0.087 0.103 0.057 0.011]
[0.029 0.059 0.039 0.07 0.058 0.072 0.009 0.017]
[9.96920997e+36, 9.96920997e+36, 9.96920997e+36, 9.96920997e+36,
9.96920997e+36, 9.96920997e+36, 9.96920997e+36, 9.96920997e+36]])
>>> masked_v = v.apply_masking()
>>> print(masked_v.data.array)
[[ -- -- -- -- -- -- -- --]
[0.023 0.036 0.045 0.062 0.046 0.073 0.006 0.066]
[0.11 0.131 0.124 0.146 0.087 0.103 0.057 0.011]
[0.029 0.059 0.039 0.07 0.058 0.072 0.009 0.017]
[ -- -- -- -- -- -- -- --]]
"""
v = _inplace_enabled_define_and_cleanup(self)
data = v.get_data(None, _units=False, _fill_value=False)
if data is not None:
fill_values = []
for prop in ("_FillValue", "missing_value"):
x = v.get_property(prop, None)
if x is not None:
fill_values.append(x)
kwargs = {"inplace": True, "fill_values": fill_values}
for prop in ("valid_min", "valid_max", "valid_range"):
kwargs[prop] = v.get_property(prop, None)
if kwargs["valid_range"] is not None and (
kwargs["valid_min"] is not None
or kwargs["valid_max"] is not None
):
raise ValueError(
"Can't apply masking when the 'valid_range' property "
"has been set as well as either of the "
"'valid_min' or 'valid_max' properties"
)
data.apply_masking(**kwargs)
return v
def creation_commands(
self,
representative_data=False,
namespace=None,
indent=0,
string=True,
name="c",
data_name="data",
header=True,
):
"""Return the commands that would create the construct.
.. versionadded:: (cfdm) 1.8.7.0
.. seealso:: `{{package}}.Data.creation_commands`,
`{{package}}.Field.creation_commands`
:Parameters:
{{representative_data: `bool`, optional}}
{{namespace: `str`, optional}}
{{indent: `int`, optional}}
{{string: `bool`, optional}}
{{name: `str`, optional}}
{{data_name: `str`, optional}}
{{header: `bool`, optional}}
:Returns:
{{returns creation_commands}}
**Examples**
>>> x = {{package}}.{{class}}(
... properties={'units': 'Kelvin',
... 'standard_name': 'air_temperature'}
... )
>>> x.set_data([271.15, 274.15, 280])
>>> print(x.creation_commands(header=False))
c = {{package}}.{{class}}()
c.set_properties({'units': 'Kelvin', 'standard_name': 'air_temperature'})
data = {{package}}.Data([271.15, 274.15, 280.0], units='Kelvin', dtype='f8')
c.set_data(data)
"""
if name == data_name:
raise ValueError(
"The 'name' and 'data_name' parameters can "
f"not have the same value: {name!r}"
)
namespace0 = namespace
if namespace is None:
namespace = self._package() + "."
elif namespace and not namespace.endswith("."):
namespace += "."
out = super().creation_commands(
namespace=namespace,
indent=0,
string=False,
name=name,
header=header,
)
data = self.get_data(None)
if data is not None:
if representative_data:
out.append(f"{data_name} = {data!r} # Representative data")
else:
out.extend(
data.creation_commands(
name=data_name,
namespace=namespace0,
indent=0,
string=False,
)
)
out.append(f"{name}.set_data({data_name})")
if string:
indent = " " * indent
out[0] = indent + out[0]
out = ("\n" + indent).join(out)
return out
@_display_or_return
def dump(
self,
display=True,
_key=None,
_omit_properties=(),
_prefix="",
_title=None,
_create_title=True,
_level=0,
_axes=None,
_axis_names=None,
):
"""A full description.
.. versionadded:: (cfdm) 1.7.0
:Parameters:
display: `bool`, optional
If False then return the description as a string. By
default the description is printed.
:Returns:
{{returns dump}}
"""
# ------------------------------------------------------------
# Properties
# ------------------------------------------------------------
string = super().dump(
display=False,
_key=_key,
_omit_properties=_omit_properties,
_prefix=_prefix,
_title=_title,
_create_title=_create_title,
_level=_level,
)
if string:
string = [string]
else:
string = []
indent1 = " " * (_level + 1)
# ------------------------------------------------------------
# Data
# ------------------------------------------------------------
data = self.get_data(None)
if data is not None:
if _axes and _axis_names:
x = [_axis_names[axis] for axis in _axes]
ndim = data.ndim
x = x[:ndim]
if len(x) < ndim:
x.extend([str(size) for size in data.shape[len(x) :]])
else:
x = [str(size) for size in data.shape]
shape = ", ".join(x)
string.append(f"{indent1}{_prefix}Data({shape}) = {data}")
return "\n".join(string)
@_manage_log_level_via_verbosity
def equals(
self,
other,
rtol=None,
atol=None,
verbose=None,
ignore_data_type=False,
ignore_fill_value=False,
ignore_properties=None,
ignore_compression=True,
ignore_type=False,
):
"""Whether two instances are the same.
Equality is strict by default. This means that:
* the same descriptive properties must be present, with the
same values and data types, and vector-valued properties
must also have same the size and be element-wise equal (see
the *ignore_properties* and *ignore_data_type* parameters),
and
..
* if there are data arrays then they must have same shape and
data type, the same missing data mask, and be element-wise
equal (see the *ignore_data_type* parameter).
{{equals tolerance}}
Any type of object may be tested but, in general, equality is
only possible with another object of the same type, or a
subclass of one. See the *ignore_type* parameter.
{{equals compression}}
{{equals netCDF}}
.. versionadded:: (cfdm) 1.7.0
:Parameters:
other:
The object to compare for equality.
{{atol: number, optional}}
{{rtol: number, optional}}
{{ignore_fill_value: `bool`, optional}}
{{verbose: `int` or `str` or `None`, optional}}
{{ignore_properties: (sequence of) `str`, optional}}
{{ignore_data_type: `bool`, optional}}
{{ignore_compression: `bool`, optional}}
{{ignore_type: `bool`, optional}}
:Returns:
`bool`
Whether the two instances are equal.
**Examples**
>>> x.equals(x)
True
>>> x.equals(x.copy())
True
>>> x.equals('something else')
False
"""
pp = super()._equals_preprocess(
other, verbose=verbose, ignore_type=ignore_type
)
if pp is True or pp is False:
return pp
other = pp
# ------------------------------------------------------------
# Check external variables (returning True if both are
# external with the same netCDF variable name)
# ------------------------------------------------------------
external0 = self._get_component("external", False)
external1 = other._get_component("external", False)
if external0 != external1:
logger.info(
f"{self.__class__.__name__}: Only one external variable)"
)
return False
if external0:
# Both variables are external
if self.nc_get_variable(None) != other.nc_get_variable(None):
logger.info(
f"{self.__class__.__name__}: External variables have "
"different netCDF variable names: "
f"{self.nc_get_variable(None)} != "
f"{other.nc_get_variable(None)})"
)
return False
return True
# ------------------------------------------------------------
# Check the properties
# ------------------------------------------------------------
if not super().equals(
other,
rtol=rtol,
atol=atol,
verbose=verbose,
ignore_data_type=ignore_data_type,
ignore_fill_value=ignore_fill_value,
ignore_properties=ignore_properties,
ignore_type=ignore_type,
):
return False
# ------------------------------------------------------------
# Check the data
# ------------------------------------------------------------
if self.has_data() != other.has_data():
logger.info(
f"{self.__class__.__name__}: Different data: Only one has data"
)
return False
if self.has_data():
if not self._equals(
self.get_data(),
other.get_data(),
rtol=rtol,
atol=atol,
verbose=verbose,
ignore_data_type=ignore_data_type,
ignore_fill_value=ignore_fill_value,
ignore_compression=ignore_compression,
):
logger.info(f"{self.__class__.__name__}: Different data")
return False
return True
def get_filenames(self):
"""Return the name of the file or files containing the data.
:Returns:
`set` The file names in normalised, absolute form. If the
data are in memory then an empty `set` is returned.
"""
data = self.get_data(None, _units=False, _fill_value=False)
if data is not None:
return data.get_filenames()
return set()
@_inplace_enabled(default=False)
def insert_dimension(self, position=0, inplace=False):
"""Expand the shape of the data array.
Inserts a new size 1 axis into the data array.
.. versionadded:: (cfdm) 1.7.0
.. seealso:: `squeeze`, `transpose`
:Parameters:
position: `int`, optional
Specify the position that the new axis will have in
the data array. By default the new axis has position
0, the slowest varying position. Negative integers
counting from the last position are allowed.
*Parameter example:*
``position=2``
*Parameter example:*
``position=-1``
{{inplace: `bool`, optional}}
:Returns:
`{{class}}` or `None`
A new instance with expanded data axes. If the
operation was in-place then `None` is returned.
**Examples**
>>> f.shape
(19, 73, 96)
>>> f.insert_dimension(position=3).shape
(19, 73, 96, 1)
>>> f.insert_dimension(position=-1).shape
(19, 73, 1, 96)
"""
v = _inplace_enabled_define_and_cleanup(self)
data = v.get_data(None, _units=False, _fill_value=False)
if data is not None:
data.insert_dimension(position, inplace=True)
return v
@_inplace_enabled(default=False)
def squeeze(self, axes=None, inplace=False):
"""Remove size one axes from the data array.
By default all size one axes are removed, but particular size
one axes may be selected for removal.
.. versionadded:: (cfdm) 1.7.0
.. seealso:: `insert_dimension`, `transpose`
:Parameters:
axes: (sequence of) `int`, optional
The positions of the size one axes to be removed. By
default all size one axes are removed.
{{axes int examples}}
{{inplace: `bool`, optional}}
:Returns:
`{{class}}` or `None`
A new instance with removed size 1 one data axes. If
the operation was in-place then `None` is returned.
**Examples**
>>> f = {{package}}.{{class}}()
>>> d = {{package}}.Data(numpy.arange(7008).reshape((1, 73, 1, 96)))
>>> f.set_data(d)
>>> f.shape
(1, 73, 1, 96)
>>> f.squeeze().shape
(73, 96)
>>> f.squeeze(0).shape
(73, 1, 96)
>>> f.squeeze([-3, 2]).shape
(73, 96)
"""
v = _inplace_enabled_define_and_cleanup(self)
data = v.get_data(None, _units=False, _fill_value=False)
if data is not None:
data.squeeze(axes, inplace=True)
return v
@_inplace_enabled(default=False)
def to_memory(self, inplace=False):
"""Bring data on disk into memory.
There is no change to data that is already in memory.
:Parameters:
inplace: `bool`, optional
If True then do the operation in-place and return `None`.
:Returns:
`{{class}}` or `None`
A copy with the data in memory, or `None` if the
operation was in-place.
"""
v = _inplace_enabled_define_and_cleanup(self)
data = v.get_data(None)
if data is not None:
data.to_memory(inplace=True)
return v
@_inplace_enabled(default=False)
def transpose(self, axes=None, inplace=False):
"""Permute the axes of the data array.
.. versionadded:: (cfdm) 1.7.0
.. seealso:: `insert_dimension`, `squeeze`
:Parameters:
axes: (sequence of) `int`, optional
The new axis order. By default the order is reversed.
{{axes int examples}}
{{inplace: `bool`, optional}}
:Returns:
`{{class}}` or `None`
A new instance with permuted data axes. If the operation
was in-place then `None` is returned.
**Examples**
>>> f.shape
(19, 73, 96)
>>> f.transpose().shape
(96, 73, 19)
>>> f.transpose([1, 0, 2]).shape
(73, 19, 96)
"""
v = _inplace_enabled_define_and_cleanup(self)
data = v.get_data(None, _units=False, _fill_value=False)
if data is not None: