1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 | # [netcdf4-python](http://unidata.github.io/netcdf4-python) [Python](http://python.org)/[numpy](http://numpy.org) interface to the netCDF [C library](https://github.com/Unidata/netcdf-c). [![Build status](https://github.com/Unidata/netcdf4-python/workflows/Build%20and%20Test/badge.svg)](https://github.com/Unidata/netcdf4-python/actions) [![PyPI package](https://badge.fury.io/py/netCDF4.svg)](http://python.org/pypi/netCDF4) [![Anaconda-Server Badge](https://anaconda.org/conda-forge/netCDF4/badges/version.svg)](https://anaconda.org/conda-forge/netCDF4) [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.2592291.svg)](https://doi.org/10.5281/zenodo.2592290) ## News For details on the latest updates, see the [Changelog](https://github.com/Unidata/netcdf4-python/blob/master/Changelog). 6/22/2021: Version [1.5.7](https://pypi.python.org/pypi/netCDF4/1.5.7) released. Fixed OverflowError on Windows when reading data with dimension sizes greater than 2**32-1. Masked arrays no longer returned for vlens. 2/15/2021: Version [1.5.6](https://pypi.python.org/pypi/netCDF4/1.5.6) released. Added `Dataset.fromcdl` and `Dataset.tocdl`, which require `ncdump` and `ncgen` utilities to be in `$PATH`. Removed python 2.7 support. 12/20/2020: Version [1.5.5.1](https://pypi.python.org/pypi/netCDF4/1.5.5.1) released. Updated binary wheels for OSX and linux that link latest netcdf-c and hdf5 libs. 12/01/2020: Version [1.5.5](https://pypi.python.org/pypi/netCDF4/1.5.5) released. Update license wording to be consistent with MIT license. 07/23/2020: Version [1.5.4](https://pypi.python.org/pypi/netCDF4/1.5.4) released. Now requires numpy >= 1.9. 10/27/2019: Version [1.5.3](https://pypi.python.org/pypi/netCDF4/1.5.3) released. Fix for [issue #972](https://github.com/Unidata/netcdf4-python/issues/972), plus binary wheels for python 3.8. 09/03/2019: Version [1.5.2](https://pypi.python.org/pypi/netCDF4/1.5.2) released. Bugfixes, no new features. 05/06/2019: Version [1.5.1.2](https://pypi.python.org/pypi/netCDF4/1.5.1.2) released. Fixes another slicing regression ([issue #922)](https://github.com/Unidata/netcdf4-python/issues/922)) introduced in the 1.5.1 release. 05/02/2019: Version [1.5.1.1](https://pypi.python.org/pypi/netCDF4/1.5.1.1) released. Fixes incorrect `__version__` module variable in 1.5.1 release, plus a slicing bug ([issue #919)](https://github.com/Unidata/netcdf4-python/issues/919)). 04/30/2019: Version [1.5.1](https://pypi.python.org/pypi/netCDF4/1.5.1) released. Bugfixes, no new features. 04/02/2019: Version [1.5.0.1](https://pypi.python.org/pypi/netCDF4/1.5.0.1) released. Binary wheels for macos x and linux rebuilt with netcdf-c 4.6.3 (instead of 4.4.1.1). Added read-shared capability for faster reads of NETCDF3 files (mode='rs'). 03/24/2019: Version [1.5.0](https://pypi.python.org/pypi/netCDF4/1.5.0) released. Parallel IO support for classic file formats added using the pnetcdf library (contribution from Lars Pastewka, [pull request #897](https://github.com/Unidata/netcdf4-python/pull/897)). 03/08/2019: Version [1.4.3.2](https://pypi.python.org/pypi/netCDF4/1.4.3.2) released. Include missing membuf.pyx file in source tarball. No need to update if you installed 1.4.3.1 from a binary wheel. 03/07/2019: Version [1.4.3.1](https://pypi.python.org/pypi/netCDF4/1.4.3.1) released. Fixes bug in implementation of NETCDF4_CLASSIC parallel IO support in 1.4.3. 03/05/2019: Version [1.4.3](https://pypi.python.org/pypi/netCDF4/1.4.3) released. Issues with netcdf-c 4.6.2 fixed (including broken parallel IO). `set_ncstring_attrs()` method added, memoryview buffer now returned when an in-memory Dataset is closed. 10/26/2018: Version [1.4.2](https://pypi.python.org/pypi/netCDF4/1.4.2) released. Minor bugfixes, added `Variable.get_dims()` method and `master_file` kwarg for `MFDataset.__init__`. 08/10/2018: Version [1.4.1](https://pypi.python.org/pypi/netCDF4/1.4.1) released. The old slicing behavior (numpy array returned unless missing values are present, otherwise masked array returned) is renabled via `set_always_mask(False)`. 05/11/2018: Version [1.4.0](https://pypi.python.org/pypi/netCDF4/1.4.0) released. The netcdftime package is no longer included, it is now a separate [package](https://pypi.python.org/pypi/cftime) dependency. In addition to several bug fixes, there are a few important changes to the default behaviour to note: * Slicing a netCDF variable will now always return masked array by default, even if there are no masked values. The result depended on the slice before, which was too surprising. If auto-masking is turned off (with `set_auto_mask(False)`) a numpy array will always be returned. * `_FillValue` is no longer treated as a valid_min/valid_max. This was too surprising, despite the fact the thet netcdf docs [attribute best practices](https://www.unidata.ucar.edu/software/netcdf/docs/attribute_conventions.html) suggests that clients should to this if `valid_min`, `valid_max` and `valid_range` are not set. * Changed 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`. * Retrieved compound-type variable data now returned with character array elements converted to numpy strings ([issue #773](https://github.com/Unidata/netcdf4-python/issues/773)). Works for assignment also. 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 in `createCompoundType` (they get converted to `('S1',N)` character array types automatically). * `valid_min`, `valid_max`, `_FillValue` and `missing_value` are now treated as unsigned integers if `_Unsigned` variable attribute is set (to mimic behaviour of netcdf-java). Conversion to unsigned type now occurs before masking and scale/offset operation ([issue #794](https://github.com/Unidata/netcdf4-python/issues/794)) 11/01/2017: Version [1.3.1](https://pypi.python.org/pypi/netCDF4/1.3.1) released. Parallel IO support with MPI! Requires that netcdf-c and hdf5 be built with MPI support, and [mpi4py](http://mpi4py.readthedocs.io/en/stable). To open a file for parallel access in a program running in an MPI environment using mpi4py, just use `parallel=True` when creating the `Dataset` instance. See [`examples/mpi_example.py`](https://github.com/Unidata/netcdf4-python/blob/master/examples/mpi_example.py) for a demonstration. For more info, see the tutorial [section](http://unidata.github.io/netcdf4-python/#section13). 9/25/2017: Version [1.3.0](https://pypi.python.org/pypi/netCDF4/1.3.0) released. Bug fixes for `netcdftime` and optimizations for reading strided slices. `encoding` kwarg added to `Dataset.__init__` and `Dataset.filepath` to deal with oddball encodings in filename paths (`sys.getfilesystemencoding()` is used by default to determine encoding). Make sure numpy datatypes used to define CompoundTypes have `isalignedstruct` flag set to avoid segfaults - which required bumping the minimum required numpy from 1.7.0 to 1.9.0. In cases where `missing_value/valid_min/valid_max/_FillValue` cannot be safely cast to the variable's dtype, they are no longer be used to automatically mask the data and a warning message is issued. 6/10/2017: Version [1.2.9](https://pypi.python.org/pypi/netCDF4/1.2.9) released. Fixes for auto-scaling and masking when `_Unsigned` and/or `valid_min`, `valid_max` attributes present. setup.py updated so that `pip install` works if cython not installed. Now requires [setuptools](https://pypi.python.org/pypi/setuptools) version 18.0 or greater. 6/1/2017: Version [1.2.8](https://pypi.python.org/pypi/netCDF4/1.2.8) released. From Changelog: * recognize `_Unsigned` attribute used by [netcdf-java](http://www.unidata.ucar.edu/software/thredds/current/netcdf-java/) to designate unsigned integer data stored with a signed integer type in netcdf-3 [issue #656](https://github.com/Unidata/netcdf4-python/issues/656). * add Dataset init memory parameter to allow loading a file from memory [pull request #652](https://github.com/Unidata/netcdf4-python/pull/652), [issue #406](https://github.com/Unidata/netcdf4-python/issues/406) and [issue #295](https://github.com/Unidata/netcdf4-python/issues/295). * fix for negative times in num2date [issue #659](https://github.com/Unidata/netcdf4-python/pull/659). * fix for failing tests in numpy 1.13 due to changes in `numpy.ma` [issue #662](https://github.com/Unidata/netcdf4-python/issues/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](https://github.com/Unidata/netcdf4-python/issues/654) * [Cython](http://cython.org) >= 0.19 now required, `_netCDF4.c` and `_netcdftime.c` removed from repository. 1/8/2017: Version [1.2.7](https://pypi.python.org/pypi/netCDF4/1.2.7) released. Python 3.6 compatibility, and fix for vector missing_values. 12/10/2016: Version [1.2.6](https://pypi.python.org/pypi/netCDF4/1.2.6) released. Bug fixes for Enum data type, and _FillValue/missing_value usage when data is stored in non-native endian format. Add get_variables_by_attributes to MFDataset. Support for python 2.6 removed. 12/1/2016: Version [1.2.5](https://pypi.python.org/pypi/netCDF4/1.2.5) released. See the [Changelog](https://github.com/Unidata/netcdf4-python/blob/master/Changelog) for changes. 4/15/2016: Version [1.2.4](https://pypi.python.org/pypi/netCDF4/1.2.4) released. Bugs in handling of variables with specified non-native "endian-ness" (byte-order) fixed ([issue #554] (https://github.com/Unidata/netcdf4-python/issues/554)). Build instructions updated and warning issued to deal with potential backwards incompatibility introduced when using HDF5 1.10.x (see [Unidata/netcdf-c/issue#250](https://github.com/Unidata/netcdf-c/issues/250)). 3/10/2016: Version [1.2.3](https://pypi.python.org/pypi/netCDF4/1.2.3) released. Various bug fixes. All text attributes in ``NETCDF4`` formatted files are now written as type ``NC_CHAR``, unless they contain unicode characters that cannot be encoded in ascii, in which case they are written as ``NC_STRING``. Previously, all unicode strings were written as ``NC_STRING``. This change preserves compatibility with clients, like Matlab, that can't deal with ``NC_STRING`` attributes. A ``setncattr_string`` method was added to force attributes to be written as ``NC_STRING``. 1/1/2016: Version [1.2.2](https://pypi.python.org/pypi/netCDF4/1.2.2) released. Mostly bugfixes, but with two new features. * support for the new ``NETCDF3_64BIT_DATA`` format introduced in netcdf-c 4.4.0. Similar to ``NETCDF3_64BIT`` (now ``NETCDF3_64BIT_OFFSET``), but includes 64 bit dimension sizes (> 2 billion), plus unsigned and 64 bit integer data types. Uses the classic (netcdf-3) data model, and does not use HDF5 as the underlying storage format. * Dimension objects now have a ``size`` attribute, which is the current length of the dimension (same as invoking ``len`` on the Dimension instance). The minimum required python version has now been increased from 2.5 to 2.6. 10/15/2015: Version [1.2.1](https://pypi.python.org/pypi/netCDF4/1.2.1) released. Adds the ability to slice Variables with unsorted integer sequences, and integer sequences with duplicates. 9/23/2015: Version [1.2.0](https://pypi.python.org/pypi/netCDF4/1.2.0) released. New features: * [get_variables_by_attributes](http://unidata.github.io/netcdf4-python/#netCDF4.Dataset.get_variables_by_attributes) ``Dataset`` and ``Group`` method for retrieving variables that have matching attributes. * Support for [Enum](http://unidata.github.io/netcdf4-python/#section12) data types. * [isopen](http://unidata.github.io/netcdf4-python/#netCDF4.Dataset.isopen) `Dataset` method. 7/28/2015: Version [1.1.9](https://pypi.python.org/pypi/netCDF4/1.1.9) bugfix release. 5/14/2015: Version [1.1.8](https://pypi.python.org/pypi/netCDF4/1.1.8) released. Unix-like paths can now be used in `createVariable` and `createGroup`. ```python 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, ```python g = nc.createGroup('/path/to') ``` now acts like `mkdir -p` in unix, creating 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__` was also added. `nc['/path/to']` now returns a group instance, and `nc['/path/to/var1']` now returns a variable instance. 3/19/2015: Version [1.1.7](https://pypi.python.org/pypi/netCDF4/1.1.7) released. Global Interpreter Lock (GIL) now released when extension module calls C library for read operations. This speeds up concurrent reads when using threads. Users who wish to use netcdf4-python inside threads should read http://www.hdfgroup.org/hdf5-quest.html#gconc regarding thread-safety in the HDF5 C library. Fixes to `setup.py` now ensure that `pip install netCDF4` with `export USE_NCCONFIG=0` will use environment variables to find paths to libraries and include files, instead of relying exclusively on the nc-config utility. ## Installation The easiest way to install is through pip: ```shell pip install netCDF4 ``` or, if you are a user of the Conda package manager, ```shell conda install -c conda-forge netCDF4 ``` ## Development installation * Clone GitHub repository (`git clone https://github.com/Unidata/netcdf4-python.git`) * Make sure [numpy](http://www.numpy.org/) and [Cython](http://cython.org/) are installed and you have [Python](https://www.python.org) 3.6 or newer. * Make sure [HDF5](http://www.h5py.org/) and netcdf-4 are installed, and the `nc-config` utility is in your Unix PATH. * Run `python setup.py build`, then `pip install -e .`. * To run all the tests, execute `cd test && python run_all.py`. ## Documentation See the online [docs](http://unidata.github.io/netcdf4-python) for more details. ## Usage ###### Sample [iPython](http://ipython.org/) notebooks available in the examples directory on [reading](http://nbviewer.ipython.org/github/Unidata/netcdf4-python/blob/master/examples/reading_netCDF.ipynb) and [writing](http://nbviewer.ipython.org/github/Unidata/netcdf4-python/blob/master/examples/writing_netCDF.ipynb) netCDF data with Python. |
Commit History @2b96493a-b732-44c2-b943-1674d9a96d46/upstream
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- New upstream version 1.5.1 Bas Couwenberg 5 years ago
- New upstream version 1.5.0.1 Bas Couwenberg 5 years ago
- New upstream version 1.5.0 Bas Couwenberg 5 years ago
- New upstream version 1.4.3.2 Bas Couwenberg 5 years ago
- New upstream version 1.4.3.1 Bas Couwenberg 5 years ago
- New upstream version 1.4.3 Bas Couwenberg 5 years ago
- New upstream version 1.4.2 Bas Couwenberg 5 years ago
- New upstream version 1.4.1 Bas Couwenberg 5 years ago
- New upstream version 1.4.0 Bas Couwenberg 6 years ago
- New upstream version 1.3.1 Bas Couwenberg 6 years ago
- New upstream version 1.3.0 Bas Couwenberg 6 years ago
- Imported Upstream version 1.2.9 Bas Couwenberg 6 years ago
- Imported Upstream version 1.2.8 Bas Couwenberg 6 years ago
- Imported Upstream version 1.2.7 Bas Couwenberg 7 years ago
- Imported Upstream version 1.2.6 Bas Couwenberg 7 years ago
- Imported Upstream version 1.2.5 Bas Couwenberg 7 years ago
- Imported Upstream version 1.2.4 Bas Couwenberg 8 years ago
- Imported Upstream version 1.2.3.1 Bas Couwenberg 8 years ago
- Imported Upstream version 1.2.3 Bas Couwenberg 8 years ago
- Imported Upstream version 1.2.2 Bas Couwenberg 8 years ago
- Imported Upstream version 1.2.1 Bas Couwenberg 8 years ago
- Imported Upstream version 1.2.0 Bas Couwenberg 8 years ago
- Imported Upstream version 1.1.9 Bas Couwenberg 8 years ago
- Imported Upstream version 1.1.8 Bas Couwenberg 8 years ago
- Imported Upstream version 1.1.7 Bas Couwenberg 9 years ago
- Imported Upstream version 1.1.4.1 Ross Gammon 9 years ago
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