The pysteps package needs the following dependencies
python >=3.8, <3.11 (lower or higher versions may work but are not tested).
Additionally, the following packages can be installed for better computational efficiency:
Other optional dependencies include:
cartopy >=0.18 (for geo-referenced visualization)
h5py (for importing HDF5 data)
pygrib (for importing MRMS data)
gdal (for importing GeoTIFF data)
pywavelets (for intensity-scale verification)
rasterio (for the reprojection module)
Important: If you only want to use pysteps, you can continue reading below. But, if you want to contribute to pysteps or edit the package, you need to install pysteps in development mode: Contributing to pysteps.
Anaconda install (recommended)#
Conda is an open-source package management system and environment management system that runs on Windows, macOS, and Linux. Conda quickly installs, runs, and updates packages and their dependencies. It also allows you to easily create, save, load, or switch between different environments on your local computer.
Since version 1.0, pysteps is available in conda-forge, a community-driven package repository for anaconda.
There are two installation alternatives using anaconda: install pysteps in a pre-existing environment or install it new environment.
In a terminal, to create a new conda environment and install pysteps, run:
$ conda create -n pysteps $ source activate pysteps
This will create and activate the new python environment. The next step is to add the conda-forge channel where the pysteps package is located:
$ conda config --env --prepend channels conda-forge
Let’s set this channel as the priority one:
$ conda config --env --set channel_priority strict
The latter step is not strictly necessary but is recommended since the conda-forge and the default Anaconda channels are not 100% compatible.
Finally, to install pysteps and all its dependencies run:
$ conda install pysteps
Install from source#
The recommended way to install pysteps from the source is using
to adhere to the PEP517 standards.
pip instead of
setup.py guarantees that all the package dependencies
are properly handled during the installation process.
OSX users: gcc compiler#
pySTEPS uses Cython extensions that need to be compiled with multi-threading support enabled. The default Apple Clang compiler does not support OpenMP. Hence, using the default compiler would have disabled multi-threading and may raise the following error during the installation:
clang: error: unsupported option '-fopenmp' error: command 'gcc' failed with exit status 1
To solve this issue, obtain the latest gcc version with Homebrew that has multi-threading enabled:
brew install gcc
To make sure that the installer uses the homebrew’s gcc, export the following environmental variables in the terminal (supposing that gcc version 8 was installed):
export CC=gcc-8 export CXX=g++-8
First, check that the homebrew’s gcc is detected:
This should point to the homebrew’s gcc installation.
Under certain circumstances, Homebrew does not add the symbolic links for the gcc executables under /usr/local/bin. If that is the case, specify the CC and CCX variables using the full path to the homebrew installation. For example:
export CC=/usr/local/Cellar/gcc/8.3.0/bin/gcc-8 export CXX=/usr/local/Cellar/gcc/8.3.0/bin/g++-8
Then, you can continue with the normal installation procedure described next.
Installation using pip#
The latest pysteps version in the repository can be installed using pip by simply running in a terminal:
pip install git+https://github.com/pySTEPS/pysteps
Or, from a local copy of the repo:
git clone https://github.com/pySTEPS/pysteps cd pysteps pip install .
The above commands install the latest version of the master branch, which is continuously under development.
If you are installing pysteps from the sources using pip, the Python interpreter must be launched outside of the pysteps root directory.
Importing pysteps from a working directory that contains the pysteps source code will raise a
This error is caused by the root pysteps folder being recognized as the pysteps package, also known as
the double import trap.
Setting up the user-defined configuration file#
The pysteps package allows the users to customize the default settings and configuration. The configuration parameters used by default are loaded from a user-defined JSON file and then stored in the pysteps.rcparams, a dictionary-like object that can be accessed as attributes or as items.
Final test: import pysteps in Python#
Activate the pysteps environment:
conda activate pysteps
Launch Python and import pysteps:
python >>> import pysteps