## Python environment

In OGS we make use of Python packages at different stages, e.g.:

Python packages are usually installed via pip inside an isolated environment (a virtual environment).

## Pip

When configuring OGS with OGS_USE_PIP=ON Python creates a new virtual environment in the .venv-directory inside your build directory. It will also install required Python packages into this environment. You can see the current environment definition in the file requirements.txt inside your build-directory.

.venv/bin/pip install python-package-name

To activate the environment run source .venv/bin/activate inside your build directory.

### Pip & Benchmarks

You can use the argument PYTHON_PACKAGES on AddTest() to specify additional Python package dependencies.

The following example would install the latest version of numpy and pandas version 0.1.2:

AddTest(
...
PYTHON_PACKAGES numpy pandas==0.1.2
...
)

This article was written by Lars Bilke. If you are missing something or you find an error please let us know.
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