Installing OpenQuake with Conda
Warning! This is not officially supported!
I use conda extensively to manage Python environments. While I have my frustrations with it, in particular the slow and brittle dependency solver, it services my needs rather well.
However, no one else at GEM uses it, so it's not supported as an environment host for OpenQuake. Nonetheless, here's what I do in general (though this seems to change slightly every year or so, whenever I make a new environment for whatever reason). Note that this involves installing from source (i.e., GitHub), rather than releases, on Linux or MacOS (or with WSL on Windows), though you could do it from the source code from a given point release if you need a specific version. I assume you already have conda installed.
Step 1: Clone (or download) the engine from
GitHub and go into the
git clone email@example.com:gem/oq-engine.git
Step 2: Go to requirements-py3x-yyyy.txt (for the platform and Python
version you're using) and comment out the line with
install a newer version that is uniquely compatible with the exact version of
Python it installs).
Step 3: Make a new conda environment with the Python version you want.
conda create -n oq python=3.9
Step 4: Activate the new environment.
conda activate oq
Step 5: Install the requirements with
pip install -r requirements-py3x-yyyy.txt
Step 6: (Optional but highly recommended) Install Numba, which is easiest
through conda. This will also install a lot of other libraries for numerical
computing, e.g. BLAS and MKL. (Note,
numba may already be installed by the
conda install numba
Step 7: Install the OpenQuake Engine in development mode.
pip install -e .
And that should work!