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Add note about PYTHONNOUSERSITE to README #1806

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Nov 19, 2021
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Add note about PYTHONNOUSERSITE to README #1806

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18 changes: 13 additions & 5 deletions README.rst
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Expand Up @@ -57,11 +57,19 @@ environment (this is optional).
The following command will set up a conda virtual environment, add the
necessary package channels, and install ctapipe specified version and its dependencies::

CTAPIPE_VER=0.11.0
wget https://raw.githubusercontent.com/cta-observatory/ctapipe/v$CTAPIPE_VER/environment.yml
conda env create -n cta -f environment.yml
conda activate cta
conda install -c conda-forge ctapipe=$CTAPIPE_VER
```
CTAPIPE_VER=0.11.0
wget https://raw.githubusercontent.com/cta-observatory/ctapipe/v$CTAPIPE_VER/environment.yml
conda env create -n cta -f environment.yml
conda activate cta
conda install -c conda-forge ctapipe=$CTAPIPE_VER
```

**Note**: To prevent packages you installed with `pip install --user` from taking precedence over the conda environment, run:

```
conda env config vars set PYTHONNOUSERSITE=1 -n cta
```

**Note**: this environment contains many useful packages that are not strictly requirements of ctapipe.
To get only ctapipe and its direct dependencies, just do ``conda install -c conda-forge ctapipe[=<version>]`` in an environment
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