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Changelog
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version 1.6.2 (not yet released)
==============================
* Added ``netCDF4.__has_set_alignment__`` property to help identify if the
underlying netcdf4 supports setting the HDF5 alignment.
* Slicing multi-dimensional variables with an all False boolean index array
now returns an empty numpy array (instead of raising an exception - issue #1197).
Behavior now consistent with numpy slicing.
* fix problem with compiling using netcdf-c < 4.9.0 (issue #1209)
version 1.6.1 (tag v1.6.1rel)
==============================
* add Dataset methods has_<name>_filter (where <name>=zstd,blosc,bzip2,szip)
to check for availability of extra compression filters.
* release GIL for all C-lib calls (issue #1180).
* Add support for nc_set_alignment and nc_get_alignment to control alignment
of data within HDF5 files.
version 1.6.0 (tag v1.6.0rel)
==============================
* add support for new quantization functionality in netcdf-c 4.9.0 via "signficant_digits"
and "quantize_mode" kwargs in Dataset.createVariable. Default quantization_mode is "BitGroom",
but alternate methods "BitRound" and GranularBitRound" also supported.
* opening a Dataset in append mode (mode = 'a' or 'r+') creates a Dataset
if one does not already exist (similar to python open builtin). Issue #1144.
Added a mode='x' option (as in python open) which is the same as mode='w' with
clobber=False.
* allow createVariable to accept either Dimension instances or Dimension
names in "dimensions" tuple kwarg (issue #1145).
* remove all vestiges of python 2 in _netCDF4.pyx and set cython language_level
directive to 3 in setup.py.
* add 'compression' kwarg to createVariable to enable new compression
functionality in netcdf-c 4.9.0. 'None','zlib','szip','zstd','bzip2'
'blosc_lz','blosc_lz4','blosc_lz4hc','blosc_zlib' and 'blosc_zstd'
are currently supported. 'blosc_shuffle',
'szip_mask' and 'szip_pixels_per_block' kwargs also added.
compression='zlib' is equivalent to (the now deprecated) zlib=True.
If the environment variable NETCDF_PLUGIN_DIR is set to point to the
directory with the compression plugin lib__nc* files, then the compression plugins will
be installed within the package and be automatically available (the binary
wheels have this). Otherwise, the environment variable HDF5_PLUGIN_PATH
needs to be set at runtime to point to plugins in order to use the new compression
options.
* MFDataset did not aggregate 'name' variable attribute (issue #1153).
* issue warning instead of raising an exception if missing_value or
_FillValue can't be cast to the variable type when creating a
masked array (issue #1152).
* Define MPI_Session for compatibility with current mpi4py (PR #1156).
version 1.5.8 (tag v1.5.8rel)
==============================
* Fix Enum bug (issue #1128): the enum_dict member of an EnumType read from a file
contains invalid values when the enum is large enough (more than 127 or 255
members).
* Binary wheels for aarch64 and python 3.10.
version 1.5.7 (tag v1.5.7rel)
==============================
* don't try to mask vlens with default _FillValue, since vlens don't have a default _FillValue.
This gets rid of numpy DeprecationWarning (issue #1099).
* update docs to reflect the fact that a variable must be in collective mode before writing
compressed data to it in parallel. Added a test for this (examples/mpi_example_compressed.py).
Issue #1108.
* Fix OverflowError when dimension sizes become greater than 2**32-1 elements on Windows (Issue #1112).
* Don't return masked arrays for vlens (only for primitive and enum types - issue #1115).
version 1.5.6 (tag v1.5.6rel)
==============================
* move CI/CD tests from travis/appveyor to Github Actions (PR #1061).
* move netCDF4 dir under src so module can be imported in source directory (PR #1062).
* change numpy.bool to numpy.bool_ and numpy.float to numpy.float_ (float and
bool are deprecated in numpy 1.20, issue #1065)
* clean up docstrings so that they work with latest pdoc.
* update cython numpy API to remove deprecation warnings.
* Add "fromcdl" and "tocdl" Dataset methods for import/export of CDL
via ncdump/ncgen called externally via the subprocess module (issue #1078).
* remove python 2.7 support.
* broadcast data (if possible)to conform to variable shape when writing to a slice
(issue #1083).
version 1.5.5.1 (tag v1.5.5.1rel)
==================================
* rebuild binary wheels for linux and OSX to link netcdf-c 4.7.4 and hdf5 1.12.0.
version 1.5.5 (tag v1.5.5rel)
==============================
* have setup.py always try use nc-config first to find paths to netcdf and
hdf5 libraries and headers. Don't use pkg-config to find HDF5 if HDF5 env
vars are set (or read from setup.cfg).
* Change MIT license text to standard OSI wording (PR #1046).
version 1.5.4 (tag v1.5.4rel)
==============================
* fix printing of variable objects for variables that end with the letter 'u'
(issue #983).
* make sure root group has 'name' attribute (issue #988).
* add the ability to pack vlen floats to integers using
scale_factor/add_offset (issue #1003)
* use len instead of deprecated numpy.alen (issue #1008)
* check size on valid_range instead of using len (issue #1013).
* add `set_chunk_cache/get_chunk_cache` module functions to reset the
default chunk cache sizes before opening a Dataset (issue #1018).
* replace use of numpy's deprecated tostring() method with tobytes()
(issue #1023).
* bump minimal numpy version to 1.9 (first version to have tobytes()).
version 1.5.3 (tag v1.5.3rel)
==============================
* make sure arrays are masked that are not filled when auto_fill is off
(issue #972).
* python 3.8 binary wheels.
version 1.5.2 (tag v1.5.2rel)
==============================
* fix for scaling bug when _Unsigned attribute is set and byteorder of data
does not match native byteorder (issue #930).
* revise documentation for Python 3 (issue #946).
* establish support for Python 2.7, 3.5, 3.6 and 3.7 (issue #948).
* use dict built-in instead of OrderedDict for Python 3.7+
(pull request #955).
* remove underline ANSI in Dataset string representation (pull request #956).
* remove newlines from string representation (pull request #960).
* fix for issue #957 (size of scalar var is a float since numpy.prod(())=1.0).
* make sure Variable.setncattr fails to set _FillValue (issue #959).
* fix detection of parallel HDF5 support with netcdf-c 4.6.1 (issue #964).
version 1.5.1.2 (tag v1.5.1.2rel)
==================================
* fix another slicing bug introduced by the fix to issue #906 (issue #922).
version 1.5.1.1 (tag v1.5.1.1rel)
==================================
* fixed __version__ attribute (was set incorrectly in 1.5.1 release).
* fix for issue #919 (assigning 2d array to 3d variable with singleton
first dimension with v[:] = a).
* minimum numpy changed from 1.9.0 to 1.10.0.
version 1.5.1 (tag v1.5.1rel)
==============================
* fix issue #908 by adding workaround for incorrect value returned
by nc_inq_var_fill for netcdf-c < 4.5.1.
* fix bug writing slice to unlimited dimension that is not the first
(leftmost). Issue #906.
* make sure data gets converted to type of scale_factor when add_offset=0
and scale_factor=1 (issue #913).
* fix for reading empty (NIL) string attributes (issue #915).
version 1.5.0.1 (tag v1.5.0.1rel)
==================================
* binary wheels for linux and macosx rebuilt against netcdf-c 4.6.3 (instead
of 4.4.1.1).
* add read-shared mode (mode='rs'). Significantly speeds up reads of NETCDF3
files (pull request #902).
version 1.5.0 (tag v1.5.0rel)
===============================
* added support for parallel IO in the classic netcdf-3 formats through the
pnetcdf library (pull request #897).
version 1.4.3.2 (tag v1.4.3.2)
===============================
* include missing membuf.pyx file in release source tarball.
version 1.4.3.1 (tag v1.4.3.1)
===============================
* fix bug in implementation of NETCDF4_CLASSIC support for parallel IO
in v1.4.3 release.
version 1.4.3 (tag v1.4.3rel)
=============================
* make set_always_mask work in MFDataset.
* fix saving diskless files to disk with netcdf-c >= 4.6.2.
* write to an in-memory Dataset, memoryview buffer returned by Dataset.close()
(issue #865, requires netcdf-c >= 4.6.2)
* fix performance regression when using large sequences of consecutive
integers for indexing with netcdf-c >= 4.6.2 (issue #870).
* improved error messages for ncinfo and other utilities (issue #873).
* fix for int64 attributes not being created for NETCDF3_64BIT_DATA (CDF5)
files (issue #878).
* fix for MPI parallel error ("NetCDF: Attempt to use feature that was not
turned on when netCDF was built") using netcdf-c 4.6.2 (issue #883).
* Added methods `set_ncstring_attrs()` to Dataset, Group and Variable that
forces all text attributes to be written as variable length strings (netCDF
type NC_STRING - issue #882).
* Allow parallel mode with NETCDF4_CLASSIC files (issue #890).
version 1.4.2 (tag v1.4.2rel)
=============================
* add get_dims Variable method (issue #824)
* make sure format keyword not ignored when mode is 'ws' (issue #827)
* fix numpy FutureWarning (non-tuple sequence for
multidimensional indexing is deprecated), issue #833.
* add 'master_file' kwarg to MFDataset.__init__ (issue #835).
* always use nc_get_vars for strided access over OpenDAP (issue #838).
* raise FutureWarning when trying to set multi-dimensional array attribute
while still silently flattening the array (issue #841). Will change
to ValueError in next release (1.4.3).
* fix parallel writes when both nc4 parallel and pnetcdf parallel options
enabled in the netcdf-c library (issue #820).
* fix for writing masked scalar character variable (issue #850).
version 1.4.1 (tag v1.4.1rel)
=============================
* disable workaround for slow nc_get_vars for __netcdflibversion__ >= 4.6.2,
since a fix was added to speed up nc_get_vars in the C library. Issue 680.
* new Dataset and Variable methods (set_always_mask) to optionally
re-enable old behaviour (return masked arrays
only if selected slice contains missing values) (issue #809).
version 1.4.0 (tag v1.4.0rel)
=============================
* fixed bug in detection of CDF5 library support in setup.py (pull request
#736, issue #713).
* fixed reading of variables with zero-length dimensions in NETCDF3_CLASSIC
files (issue #743).
* allow integer-like objects in VLEN slices (not just python ints, issue
#526, pull request #757).
* treating _FillValue as a valid_min/valid_max was too surprising, despite
the fact the thet netcdf docs 'attribute best practices' suggests that
clients should to this. Revert this change from issue #576 (issue #761).
* remove netcdftime, since it is now a separate package. date2num, num2date
and date2index still importable from netCDF4.
* fix 'Unreachable code' cython warning (issue #767).
* Change behavior of string attributes so that nc.stringatt = ['foo','bar']
produces an vlen string array attribute in NETCDF4, instead of concatenating
into a single string ('foobar'). In NETCDF3/NETCDF4_CLASSIC, an IOError
is now raised, instead of writing 'foobar'. Issue #770.
* fix loading of enum type names (issue #775).
* make sure missing_value applies only to scaled short integers if
auto-scaling is on (issue #777).
* automatically create views of compound types with character arrays as
numpy strings (issue #773). Can be disabled using
'set_auto_chartostring(False)'. Numpy structured
array dtypes with 'SN' string subtypes can now be used to
define netcdf compound types (they get converted to ('S1',N)
character array types automatically).
* always return masked array by default, even if there are no
masked values (too surprising to get ndarray or MaskedArray depending
on slice, issue #785).
* treat valid_min/valid_max/_FillValue/missing_value as unsigned
integers if _Unsigned is set (to mimic behaviour of netcdf-java).
Conversion to unsigned type now occurs before masking and scale/offset
operation. Issue #794.
version 1.3.1 (tag v1.3.1rel)
=============================
* add parallel IO capabilities. netcdf-c and hdf5 must be compiled with MPI
support, and mpi4py must be installed. To open a file for parallel access,
use `parallel=True` in `Dataset.__init__` and optionally pass the mpi4py Comm instance
using the `comm` kwarg and the mpi4py Info instance using the `info` kwarg.
IO can be toggled between collective and independent using `Variable.set_collective`.
See `examples/mpi_example.py`. Issue #717, pull request #716.
Minimum cython dependency bumped from 0.19 to 0.21.
* Add optional `MFTime` calendar overload to use across all files, for example,
`'standard'` or `'gregorian'`. If `None` (the default), check that the calendar
attribute is present on each variable and values are unique across files raising
a `ValueError` otherwise.
* Allow _FillValue to be set for vlen string variables (issue #730).
version 1.3.0 (tag v1.3.0rel)
==============================
* always search for HDF5 headers when building, even when nc-config is used
(since nc-config does not always include the path to the HDF5 headers).
Also use H5get_libversion to obtain HDF5 version info instead of
H5public.h. Fixes issue #677.
* encoding kwarg added to Dataset.__init__ and Dataset.filepath (default
is to use sys.getfilesystemencoding()) so that oddball
encodings (such as cp1252 on windows) can be handled in Dataset
filepaths (issue #686).
* Calls to nc_get_vars are avoided, since nc_get_vars is very slow (issue
#680). Strided slices are now converted to multiple calls to
nc_get_vara. This speeds up strided slice reads by a factor of 10-100
(especially for NETCDF4/HDF5 files) in most cases. In some cases, strided reads
using nc_get_vars are faster (e.g. strided reads over many dimensions
such as var[:,::2,::2,::2])), so a variable method use_nc_get_vars was added.
var.use_nc_get_vars(True) will tell the library to use nc_get_vars instead
of multiple calls to nc_get_vara, which was the default behaviour previous
to this change.
* fix utc offset time zone conversion in netcdftime - it was being done
exactly backwards (issue #685 - thanks to @pgamez and @mdecker).
* Fix error message for illegal ellipsis slicing, add test (issue #701).
* Improve timezone format parsing in netcdftime
(https://github.com/Unidata/netcdftime/issues/17).
* make sure numpy datatypes used to define CompoundTypes have
isalignedstruct flag set to True (issue #705), otherwise.
segfaults can occur. Fix required raising them minimum numpy requirement
from 1.7.0 to 1.9.0.
* ignore missing_value, _FillValue, valid_range, valid_min and valid_max
when creating masked arrays if attribute cannot be safely
cast to variable data type (and issue a warning). When setting
these attributes don't cast to variable dtype unless it can
be done safely and issue a warning. Issue #707.
version 1.2.9 (tag v1.2.9rel)
==============================
* Fix for auto scaling and masking when _Unsigned attribute set (create
view as unsigned type after scaling and masking). Issue #671.
* Always mask values outside valid_min, valid_max (not just when
missing_value attribue present). Issue #672.
* Fix setup.py so pip install doesn't fail if cython not installed.
setuptools >= 18.0 now required for installation (Issue #666).
version 1.2.8 (tag v1.2.8rel)
==============================
* recognize _Unsigned attribute used by netcdf-java to designate unsigned
integer data stored with a signed integer type in netcdf-3 (issue #656).
* add Dataset init memory parameter to allow loading a file from memory
(pull request #652, issues #406 and #295).
* fix for negative times in num2date (issue #659).
* fix for failing tests in numpy 1.13 due to changes in numpy.ma (issue #662).
* Checking for _Encoding attribute for NC_STRING variables, otherwise use
'utf-8'. 'utf-8' is used everywhere else, 'default_encoding' global module
variable is no longer used. getncattr method now takes optional kwarg
'encoding' (default 'utf-8') so encoding of attributes can be specified
if desired. If _Encoding is specified for an NC_CHAR ('S1') variable,
the chartostring utility function is used to convert the array of
characters to an array of strings with one less dimension (the last
dimension is interpreted as the length of each string) when reading the
data. When writing the data, stringtochar is used to convert a numpy
array of fixed length strings to an array of characters with one more
dimension. chartostring and stringtochar now also have an 'encoding' kwarg.
Automatic conversion to/from character to string arrays can be turned off
via a new set_auto_chartostring Dataset and Variable method (default
is True). Addresses issue #654.
* Cython >= 0.19 now required, _netCDF4.c and _netcdftime.c removed from
repository.
version 1.2.7 (tag v1.2.7rel)
==============================
* fix for issue #624 (error in conversion to masked array when variable slice
returns a scalar). This is a regression introduced in 1.2.5 associated
with support for vector missing_values. Test (tst_masked5.py) added for
vector missing_values.
* fix for python 3.6 compatibility (error retrieving character _FillValue attribute,
issue #626). Test with python 3.6 using travis CI.
version 1.2.6 (tag v1.2.6rel)
==============================
* fix some test failures on big endian PPC64 that were due to
errors in byte-swapping logic. Also fixed bug in enum
code exposed on PPC64 (issue #608).
* remove support for python 2.6 (it probably still will work for a while
though).
* Sometimes checking that data being assigned to a variable has
an 'ndim' attribute is not sufficient, instead check to see that
the object supports the buffer interface (issue #613).
* make get_variables_by_attributes work in MFDataset (issue #610)
The hack is also applied for set_auto_maskandscale, set_auto_scale,
set_automask, so these don't have to be duplicated in MFDataset (pull
request #571).
version 1.2.5 (tag v1.2.5rel)
==============================
* Add MFDataset.set_auto_maskandscale (plus set_auto_scale, set_auto_mask).
Fixes issue #570.
* Use valid_min/valid_max/valid_range attributes when defining mask
(issue #576). Values outside the valid range are considered to
be missing when defining the mask.
* Fix for issue #584 (add support for dates before -4712-1-1 in 360_day
and 365_day calendars to netcdftime.utime).
* Fix for issue #593: add support for datetime.timedelta operations
(adding and subtracting timedelta, subtracting two datetime
instances to compute time duration between them), implement
datetime.replace() and datetime.__str__(). datetime.__repr__()
includes the full state of an instance. Add datetime.calendar.
datetime comparison operators have full accuracy now.
* Fix for issue #585 by increasing the size of the buffer used to store the
filepath.
* Fix for issue #592: Add support for string array attributes. (When
reading, a vlen string array attribute is returned as a list of
strings. To write, use var.setncattr_string("name", ["two", "strings"]).)
* Fix for issue #596 - julian day calculations wrong for negative years,
caused incorrect rountrip num2date(date2num(date)) roundtrip for dates with year
< 0.
* Make sure negative years work in utime.num2date (issue #596).
* raise NotImplementedError when trying to pickle Dataset, Variable,
CompoundType, VLType, EnumType and MFDataset (issue #602).
* Fix for issue #527: initialize vldata[i].p in Variable._get(...).
version 1.2.4 (tag v1.2.4rel)
==============================
* Fix for issue #554. It is now ensured that data is in native endian
byte order before passing to netcdf-c library. Data read from variable
with non-native byte order is also byte-swapped, so that dtype remains
consistent with netcdf variable. Behavior now consistent with h5py.
* raise warning for HDF5 1.10.x (issue #549), since backwards
incompatible files may be created.
* raise AttributeError instead of RuntimeError when attribute operation
fails. raise IOError instead of RuntimeError when nc_create or
nc_open fails (issue #546).
* Use NamedTemporaryFile instead of deprecated mktemp in tests
(pull request #543).
* add AppVeyor automated windows tests (pull request #540).
version 1.2.3.1 (tag v1.2.3.1rel)
==================================
* fix bug in setup.py (pull request #539, introduced in issue #518).
version 1.2.3 (tag v1.2.3rel)
==============================
* try to avoid writing NC_STRING attributes if possible, by
trying to convert unicode strings to ascii and write as NC_CHAR (issue
#529). This preserves compatibility with clients (like Matlab) that
can't deal with NC_STRING attributes. A 'setncattr_string' method
was added for Dataset and Variable to that users can force attributes
to be written as NC_STRING if necessary.
* fix failing tests with numpy 1.11 (issues #521 and #522).
* fix indentation bug in nc4tonc3 utility (issue #519).
* add the capability in setup.py to use pkg-config instead of
nc-config (pull request #518).
* make sure slices which return scalar masked arrays
are consistent with numpy.ma (issue #515).
* add test/tst_cdf5.py and test/tst_filepath.py (to test new
NETCDF3_64BIT_DATA format and filepath Dataset method).
* expose netcdftime.__version__ (issue #504).
* fix potential memory leak in Dataset.filepath in attempt to fix
mysterious segfaults on CentOS6 (issue #506). Segfaults
can apparently still occur on systems like CentOS6 with old versions of glibc.
version 1.2.2 (tag v1.2.2rel)
=============================
* fix failing tests on python 2.6 (issue #497). Change minimum required
python from 2.5 to 2.6.
* Potential memory leaks fixed by freeing string pointers internally allocated
in netcdf-c using nc_free_string. Also use nc_free_vlens to free space allocated
for vlens inside netcdf-c (issue #495).
* invoke str on filename argument to Dataset constructor, so pathlib
instances can be used (issue #489).
* don't use hardwired NC_MAX_DIMS or NC_MAX_VARS internally to allocate space
for dimension or variable ids. Instead, find out the number of dims
and vars and use malloc. NC_MAX_NAME is still used to allocate space
for attribute and variable names, since there is no obvious way to
determine the length of these names.
* if trying to write a unicode attribute, check to see if it exists
first and is NC_CHAR, and if so, delete it and recreate it. Workaround for C
lib bug discovered in issue #485.
* support for NETCDF3_64BIT_DATA format supported in netcdf-c 4.4.0.
Similar to NETCDF3_64BIT (now NETCDF3_64BIT_OFFSET), but includes
64 bit dimensions and sizes, plus unsigned and 64 bit integer
data types.
* make sure chunksize does not exceed dimension size
(for non-unlimited dimensions) on variable creation (issue #480).
* add 'size' attribute to Dimension (same as len(d), where
d is a Dimension instance, issue #477).
* fix bug in nc3tonc4 with --unpackshort=1 (issue #474).
* dates do not have to be contiguous, i.e. can be before and after the
missing dates in Gregorian calendar (pull request #476).
version 1.2.1 (tag v1.2.1rel)
=============================
* add the capability to slice variables with unsorted integer sequences,
or integer sequences with duplicates (issue #467). This was done
by converting boolean array slices to integer array slices internally,
instead of the other way around.
* raise TypeError if masked array assigned to a VLEN str variable slice
(issue #464).
* Ellipsis now can be used with scalar VLEN str variables (issue #458).
Slicing of scalar VLEN (non-str) variables now works.
* Allow non-positive reference years in non-real-world calendars
(issue #442).
version 1.2.0 (tag v1.2.0rel)
=============================
* Fixes to setup.py for building on windows (issue #460).
* warnings now issued if file being read contains unsupported
variables or data types (they were previously being silently
skipped).
* added 'get_variables_by_attributes' method (issue #454).
* check for 'units' attribute in date2index (issue #453).
* added support for enum types (issue #452).
* added 'isopen' Dataset method (issue #450).
* raise ValueError if year 0 or negative year used in time units string.
The year 0 does not exist in the Julian and Gregorian
calendars (issue #442).
version 1.1.9 (tag v1.1.9rel)
=============================
* fix for issue #391 (data is already byte-swapped to native
endian format by the HDF4 library).
* fix for issue #415 (copy.deepcopy does not work on
netcdftime datetime object).
* fix for issue #420 - len(v) where v is a scalar variable returned
unexpected IndexError, now returns "TypeError: len() on unsized object"
(same as numpy does for len() on a scalar array).
* translate docstrings from epydoc markup to markdown, so
pdoc can be used (epydoc is dead).
* add small offset in conversion to Julian date for numerical
stability (more accurate round trip calculations). This offset is removed
in back conversion only from microseconds. Pull request #433.
* add detection of unsigned integers to handling of automatic
packing (set_auto_scale and set_auto_maskandscale) when writing.
Pull request #435.
* use USE_SETUPCFG env var to over-ride use of setup.cfg. If USE_SETUPCFG
evaluates to false, setup.cfg will not be used and all configuration
variables can be set from environment variables. Useful when using 'pip
install' and nc-config is broken (issue #438).
* fix for integer overflow in date2index (issue #444).
version 1.1.8 (tag v1.1.8rel)
=============================
* v[...] now returns a numpy scalar array (not just a scalar) when
v is a scalar netcdf variable (issue #413).
* unix-like paths can now be used in createVariable and createGroup.
v = nc.createVariable('/path/to/var1',('xdim','ydim'),float)
will create a Variable named 'var1', while also creating the Groups
'path' and 'path/to' if they do not already exist.
Similarly, g = nc.createGroup('/path/to') acts like 'mkdir -p' in unix, creating
the Groups 'path' and '/path/to', if they don't already exist.
Users who relied on nc.createGroup(groupname) failing when the
group already exists will have to modify their code, since nc.createGroup
will now return the existing group instance.
Dataset.__getitem__ also added. nc['/path/to'] returns
a Group instance, and nc['/path/to/var1'] returns a Variable
instance.
* change minimum required numpy to 1.7.0, fix so all tests pass with 1.7.0.
Added travis tests for minimum required cython, numpy (issue #404).
* enable abbreviations to time units specification, as allowed in CF (issue
#402). Now, instead of just 'seconds' and 'seconds', 'secs', 'sec' and 's'
are also allowed (similar to minutes, days and hours).
* install utility scripts in utils directory with setuptools entry points
(pull request #392 from @mindw). Code for utilities moved
to netCDF4_utils.py - makes utilities more windows-friendly.
* make sure booleans are treated correctly in setup.cfg. Add
use_cython (default True) to setup.cfg. If set to False, then
cython will not be used to compile netCDF4.pyx (existing netCDF4.c
will be used instead).
* use "from Cython.Build import cythonize" instead of
"from Cython.Distutils import build_ext" in setup.py (issue #393)
to conform to new cython build mechanism (CEP 201, described at
https://github.com/cython/cython/wiki/enhancements-distutils_preprocessing).
* unicode attributes now written as strings, not bytes (using
nc_put_att_string instead of nc_put_att_text, issue #388).
* add __orthogonal_indexing__ attribute to Variable, Dataset and Group (issue #385) to
denote that Variable objects do not follow numpy indexing semantics for integer and
boolean array indices.
* make sure application of scale_factor and add_offset works correctly when
scale_factor not given (issue #381).
* add man pages for nc3tonc4, nc4tonc3, ncinfo in man directory.
Not installed by setup.py (contributed by Ross Gammon, issue #383).
* replace tabs with spaces by running reindent.py on all *.py and *.pyx files
(issue #378).
* refactor netCDF4_utils and netCDF4 module into netCDF4 package.
Refactoring effectively removes netCDF4 utils private attributes from
netCDF4 namespace, so has the potential to break code using private
attributes (issue #409).
version 1.1.7 (tag v1.1.7rel)
=============================
* check to make sure cython >= 0.19 is available before trying
to use it (otherwise compilation with fail). Issue 367.
* add ipython notebooks from Unidata workshop in examples directory.
* fix ellipsis variable slicing regression (issue 371).
* release the Global Interpreter Lock (GIL) when calling the C
library for read operations. Speeds up multi-threaded reads
(issue 369). Caution - the HDF5 library may need to be compiled
with the threadsafe option to ensure that global data structures
are not corrupted by simultaneous manipulation by different threads.
* Make sure USE_NCCONFIG environment variable takes precedence over value
of use_ncconfig in setup.cfg. With this change, 'pip install netCDF4'
with USE_NCCONFIG=1 will use environment variables to find paths to
libraries and include files, instead of relying on nc-config (issue #341).
version 1.1.6 (tag v1.1.6rel)
=============================
* fix for issue 353 (num2date can no longer handle units like 'hours since
2000-01-01 0').
* fix for issue 354 (num2date no longer supports multi-dimensional arrays).
* fix for spurious UserWarning about endian-ness mismatch (issue 364).
* make calendar name keyword for num2date/date2num case insensitive
(issue 362).
* make sure units parser returns time-zone naive datetime instance that
includes UTC offset (issue 357). UTC offset was applied incorrectly in
netcdftime.date2num and num2date. No longer need to depend on
python-dateutil.
version 1.1.5 (tag v1.1.5rel)
=============================
* add dependency on python-dateutil in setup.py and install docs.
* use python datetime in num2date and date2num whenever possible. Remove
duplicate num2date and date2num functions from netcdftime. Addresses issue
#344. Add microsecond capability to netcdftime.datetime. Roundtrip
accuracy of num2date/date2num now down to less than a millisecond.
* use nc-config by default to find dependencies. setup.py modified to handle failure
to find nc-config more gracefully (issue #340). If you wish to use env vars to point
to the libs, you must first move the setup.cfg file out of the way
(rename it to setup.cfg.save), or set USE_NCCONFIG to 0.
* if endian-ness of variable is specified, adjust datatype to reflect this when opening
a file (issue 346).
* fix for issue #349 (seconds outside the range 0-59 in netcdftime.num2date).
version 1.1.4 (tag v1.1.4rel)
=============================
* speedup conversion of array indices to slices (issue #325).
* fix for issue #330 (incorrect values for seconds returned by netcdftime).
* fix reading of scalar vlen variables (issue #333).
* setting fill_value=False in createVariable for vlen and compound variables
now does nothing, instead of causing an error when the Dataset is closed
(issue #331).
* cython will regenerate netCDF4.c when install is run, not just build.
Makes 'pip install' do the right thing when cython is installed (issue #263).
version 1.1.3 (tag v1.1.3rel)
=============================
* checked in _datetime.c to git (resolves issue #315). Note - _datetime.c
was *not* included in the 1.1.2 release.
* Changed __str__ to __repr__ in MFDataset, to be consistent with Dataset
(issue #317). IPython uses __repr__ to make use-friendly human-readable summaries
of objects in the terminal.
version 1.1.2 (tag v1.1.2rel)
=============================
* fix for issue 312 (allow slicing with objects that can be cast to ints).
* indexing netCDF variables with integer sequences and boolean arrays now
behave the same way (integer sequences are converted to boolean arrays
internally). Addresses issue #300. Since indexing using integer sequences
does not behave exactly as before, some client code may break. For example,
previously when integer index arrays had the same length, and that length
was equal to the number of dimensions of the array being indexed,
netcdf4-python mirrored the numpy indexing behavior and treated the elements
of the index arrays as individual sets of integer indices. This special
case has been removed. An IndexError is now raised when the new behavior
would produce a different result than the old, i.e. when the
indices in an integer sequence are not sorted, or there are duplicate
indices in the sequence.
* fix for issue #310 (masked arrays not returned correctly when variable
has non native endian-ness).
* fix for issue #306 (slicing variable with "-1" when there is only
one element along that dimension).
* Improved speed of num2date and date2num for standard, julian, gregorian
and proleptic gregorian calendars by vectorizing the functions. See Issue #296
* Fix for issue #301 ("Datestring parser chokes on years with extra space").
* Add name property for Dimension, Variable and Group instances (to access string
name associated with instance).
* Allow for null byte attributes (so _FillValue='\x00' can be set manually).
Issue 273.
* Added __repr__ (matching __str__) for all types (pull request #291).
IPython uses __repr__ to make use-friendly human-readable summaries
of objects in the terminal.
version 1.1.1 (tag v1.1.1rel)
==============================
* make sure _FillValue is a byte for character arrays in Python 3 (issue
271).
* add numpy to install_requires in setup.py (issue #282, fixes issue #211).
'pip install netcdf4-python' will no longer fail if numpy not installed.
* Fix for issue 278 (UnicodeDecodeError reading netcdf.h from setup.py with
Python 3.4).
* Make netcdftime.datetime immutable and hashable (issue 255).
* Fix issue with slicing of scalar VLEN arrays (issue 270).
* Add set_auto_mask and set_auto_scale methods to control auto scaling and
auto masking separately. (issue 269). Also added set_auto_maskandscale,
set_auto_scale, set_auto_mask Dataset/Group methods that recursively walk
through all variables in the Dataset/Group.
* Make sure file_format attribute propagated to Group instances (issue 265).
* Fix for issue #259 ("Cannot use broadcasting to set all elements of a
Variable to a given value").
version 1.1.0 (tag v1.1.0rel)
=============================
* revert weakref change, so that previous behaviour (Dimensions and Variables
keep strong references to parent Dataset) is the default. New keyword
argument 'keepweakref' for Dataset.__init__ can be set to true to get
weak references.
version 1.0.9 (tag v1.0.9rel)
=============================
* speed up the creation of new Group instances (issue 239).
* fix logic errors in setup.py (issue 236).
* it is now possible to create and set variable length string variables with
numpy string datatypes (pull request 224).
* add .travis.yml (for travis-ci testing on github), silence warnings from
test output (issue 225).
* modify __unicode__ for Variable and Dimension to return more useful error
message when Dataset object has been garbage collected.
* use weak references to group instances when creating Dimension and Variable
objects. This prevents cyclic references messing up garbage collection (issue
218, pull request 219).
* accessing values from a 0-dimensional Variable now returns a 0-dimensional
numpy array, not a 1-dimensional array (issue 220). To write code
compatible with both the old and new (fixed) behavior, wrap values accessed
from a 0-dimensional Variable with numpy.asscalar.
* add an __array__ method to Variable to make numpy ufuncs faster (issue 216).
* change download_url in setup.py to point to pypi instead of googlecode.
* fix for date2index error when time variable has only one entry (issue 215).
* silence warnings ("Non-trivial type declarators in shared declaration (e.g.
mix of pointers and values). Each pointer declaration should be on its own
line") with Cython 0.2.
* reduced memory usage for Variable.__getitem__ under Python 2.
version 1.0.8 (tag v1.0.8rel)
=============================
* change file_format Dataset attribute to data_model (keeping file_format
for backward compatibility). Add disk_format attribute (underlying
disk format, one of NETCDF3, HDF4, HDF5, DAP2, DAP4, PNETCDF or UNDEFINED).
Uses nc_inq_format_extended, added in version 4.3.1 of library. If using
earlier version of lib, disk_format will be set to UNDEFINED.
* default _FillValue now ignored for byte data types (int8 and uint8) as per
http://www.unidata.ucar.edu/software/netcdf/docs/netcdf-c/Fill-Values.html#Fill-Values
"If you need a fill value for a byte variable, it is recommended that you
explicitly define an appropriate _FillValue attribute, as generic utilities
such as ncdump will not assume a default fill value for byte variables".
ncinfo now returns fill mode information (issue 209).
* check to see if filling was disabled before masking data equal to
default fill value (issue 209).
* add variable type information to Dataset.__repr__ (output of ncinfo).
version 1.0.7 (tag v1.0.7rel)
=============================
* add the ability to specify the locations of hdf4,jpeg and curl libs, in
case netCDF4 was built statically with HDF4 and/or OpenDAP support (issue
207).
* add 'ncinfo' utility (like 'ncdump -h' but less verbose).
* more information displayed when Dataset or Group instance is printed.
* fix for issue 194 (versions after 1.0.5 fail for netcdf 4.1.1, due to
call to nc_inq_path, which was added in netcdf 4.1.2). Fixed by adding
compile time API check similar to what was done for nc_rename_grp. If
filepath Dataset method is called an exception will be raised at runtime
if the module was built with netcdf < 4.1.2, or cython was not installed
at build time.
* fix for issues 202 and 206 (exception raised by numpy.isnan for character data types).
* if dateutils not installed and time unit accuracy < 1 second requested, have
netcdftime raise an ImportError.
version 1.0.6 (svn revision 1312)
================================
* issue warning of endian-ness of dtype argument does not match endian kwarg in
createVariable.
* make sure netcdf type NC_CHAR always returned in numpy array dtype 'S1'
(sometimes arrays of type 'U1' were being returned). Fixes intermittently failing
test tst_compoundatt.py on python 3.3.
* fix for issue 201 (if data associated with numpy array not the
same endian-ness as dtype, data was written incorrectly). Now
bytes are swapped if necessary. Variable.endian() now returns
'native' instead of None for NETCDF3 formatted files. createVariable
now enforces endian='native' for NETCDF3 files. Added tst_endian.py
test case.
* fix for issue 200 (library version detection failed on cygwin).
* fix for issue 199 (nc4tonc3 utility not copying global attributes).
* fix for issue 198 (setup.py chokes when no arguments given).
* fix for issue 197 (slicing of netCDF variables using lists of integers).
* create 'path' attribute for group instance using posixpath, instead
of os.path (to ensure the unix path is used on all platforms). Issue 196.
* fix for issue 196 (test failures on win32 due to files being deleted
before they are closed).
version 1.0.5 (svn revision 1278)
================================
* change setup.py to compile the Cython sources directly, if
cython is available.
This allows for "ifdef" like capability to modify source at compile time to
account for changes in netcdf API (e.g. the forthcoming addition of the
nc_rename_grp in version 4.3.1).
* added a "renameGroup" method, which raises an exception if
the netcdf lib version linked does not support it. Requires
netcdf >= 4.3.1.
* support for more than one missing value (missing_value attribute
is a vector) when converting to masked array.
* add 'renameAttribute' method to Dataset, Group and Variable.
* fix so that var[:] = x works if x is a scalar, and var is a netcdf variable
with an unlimited dimension that has shape () - i.e. no data has been
written to it yet. Before this change, var[:] = x did not write any data.
Now the scalar x will be written as the first entry in var along the
unlimited dimension.
* remove dos line feeds from nc3tonc4 (issue 181).
* add datatype property for Variable that returns numpy dtype for primitive
datatypes (same as dtype attribute) but returns CompoundType or VLType
instance for compound or vlen variables (issue 178).
* fix logic for deciding where to look for nc-config in setup.py (issue 177).
* issue a warning and don't try to apply scale_factor or add_offset if these
attributes are not convertible to floats (issue 176).
* add filepath method to Dataset instance to return file path (or opendap
URL) used to create Dataset (issue 172).
* fix for issue 170 (opening a remote DAP dataset fails after creating
a NETCDF4 formatted file).
* fix for issue 169 (error in chartostring function on 64-bit windows).
* add support for missing_value or _FillValue == NaN (issue 168).
* added a Dimension.group() method (issue 165).
version 1.0.4 (svn revision 1229)
=================================
* fixed alignment bug that could cause memory corruption
when reading compound type variables. All users of compound
types should upgrade.
version 1.0.3 (svn revision 1219)
=================================
* don't try to write empty data array to netcdf file (fixed failing
test with netcdf 4.3.0rc2).
* date2num, num2date and date2index now can handle units of microseconds and milliseconds
(for proleptic_gregorian calendar, or gregorian and standard calendars
as long as the time origin is after 1582-10-15). Issue 159.
* Added a _grp attribute to Dimension (issue 165).
* don't bundle ordereddict (issue 164).
* support reading of vlen string attributes (issue 156).
* add --vars option to nc3tonc4 (issue 154).
* Don't try to set fletcher32 checksum on scalar variables (it causes HDF5
to crash). Fixes issue 150.
* Add --istart/--istop options to nc3tonc4 (issue 148, courtesy of
Rich Signell).
* fix for proleptic_gregorian in netcdftime.py (courtesy of Matthias Cuntz).
version 1.0.2 (svn revision 1196)
=================================
* disable version check for HDF5, which is broken by hdf5 1.8.10.
* make sure all files have a calendar attribute in MFTime (issue 144).
* more robust fix to issue 90 (array shape modified by assignment to
a netCDF variable with one more dimension), including test case.
version 1.0.1 (svn revision 1190)
=================================
* fix error that occurred when retrieving data from a variable that has a
missing_value attribute specified as a string (issue 142).
* automatically close netcdf files when there are no references
left to Dataset object (using __dealloc__ method). Fixes issue 137.
* fix for slicing of scalar vlen string variables (issue 140).
* fix to allow writing of unicode data to a NC_CHAR variable.
* allow for writing of large variables (> 2**32 elements). Fixes issue 130.
version 1.0fix1
===============
* fix python 3 incompatibility in setup.py (issue 125).
version 1.0 (svn revision 1164)
===============================
* add 'aggdim' keyword to MFDataset, so the name of the dimension
to aggregate over can be specified (instead of using the unlimited
dimension). aggdim=None by default, which results in the previous
behavior. aggdim must be the leftmost dimension of all the variables
to be aggregated.
* raise IndexError when indexing a netcdf variable out of range
so iterating over a variable in a for loop behaves as expected
(as described in http://effbot.org/zone/python-for-statement.htm).
Fixes issue 121.
* added MacPorts portfile (so it can be installed via MacPorts
on macosx using a "local Portfile repository"). Installs
from svn HEAD using 'port install netcdf4-python'.
* added experimental 'diskless' file capability (only added to the C
lib after the 4.2 release). Controlled by kwarg 'diskless' to
netCDF4.Dataset (default False). diskless=True when creating a file
results in a file that exists only in memory, closing the file
makes the data disapper, except if persist=True keyword given in
which case it is persisted to a disk file on close. diskless=True
when opening a file creates an in-memory copy of the file for faster access.
* add the ability to specify the location of the required libs
(and whether to use nc-config) with setup.cfg,
instead of using environment variables.
* fix ISO9601 date parser so it recognizes time zone offsets in time unit
strings (contributed by David Hassel, issue 114, r1117).
* add setncatts Dataset,Group and Variable method to add a bunch of
attributes (given in a python dictionary) at once. Speeds things
up for NETCDF3 and NETCDF4_CLASSIC files a lot, since nc_redef/nc_enddef
not need to be called for each attribute (issue 85, r1113). Adding 1000
attributes is about 35 times faster using setncatts to add them all at once.
Makes no difference for NETCDF4 formatted files, since nc_redef/nc_enddef
is not called.
* only round after apply scale_factor and add_offset if variable type is
integer (issue 111, r1109).
* Fixed bug with all False Boolean index (r1107).
* added support for after, before and nearest selection method to date2index
fast "first guess" indexing (r1106).
* Remove white space in time units string (netcdftime._parse_date).
An extra space in the time units of one CMIP3 model caused an error
(r1105).
* based on results with examples/bench_compress2.py, change
default complevel for zlib compression from 6 to 4. If complevel=0,
turn compression off entirely (set zlib=False) (r1102).
version 0.9.9 (svn revision 1099)
================================
* changed default unicode encoding from "latin-1" to "utf-8", since
this is the python 3 default, and the only encoding that appears to
work for dimension and variable names.
* added test case for unicode attributes, variable and dimension names.
* fixes for unicode variable, dimension and group names.
* fix for unicode attributes in python3 (ncdump did not intrepret them as
text strings). Issue 107.
* add --format option to nc4tonc3 utility (can be either NETCDF3_CLASSIC or
NETCDF3_64BIT). Fixes issue 104.
version 0.9.8 (svn revision 1080)
================================
* use numpy.ma.isMA to check for masked array (instead of checking
for presence of 'mask' attribute).
* fixes for AIX with ibm xlc compiler.
* make sure unicode attributes don't get converted to ascii strings (issue
98).
version 0.9.7 (svn revision 1073)
================================
* Added __str__ methods to Dataset, Variable, Dimension, CompoundType,
VLType and MFDataset, so useful human-readable information is provided when these
objects are printed in an interactive session.
* don't try to apply scale_factor and offset if scale_factor=1 and
add_offset=0 (to avoid making copies of large arrays).
* changed netCDF4._default_fillvals to netCDF4.default_fillvals (to make part
of public API). Added to docs (issue 94).
version 0.9.6 (svn revision 1043)
=================================
* changed default unicode encoding from "ascii" to "latin-1" (iso-8859-1).
* add "unicode_error" module variable to control what happens when characters
cannot be decoded by the encoding specified by the "default_encoding" module
variable (which is "ascii" by default). unicode_error = "replace" by default
which means bad characters are replace by "?". Previously an error was
raised, the old behavior can be obtained by setting unicode_error = 'strict'.
Fixes issue 92.
* add __enter__ and __exit__ methods so you can do "with Dataset(url) as f:"