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.. _build-install-faq:
=================
Build/Install FAQ
=================
*How do I set up a development version of SciPy in parallel to a released
version that I use to do my job/research?*
If you use the ``conda`` package manager, this is covered in the
:ref:`quickstart-mac`, specifically in :ref:`quickstart-mac-install`.
Another simple way to achieve this is to install the released version in
site-packages, by using a binary installer or pip, for example, and set
up the development version in a virtualenv. First, install
`virtualenv`_ (optionally, use `virtualenvwrapper`_), then create your
virtualenv (named scipy-dev here) with::
$ virtualenv scipy-dev
Now, whenever you want to switch to the virtual environment, you can use the
command ``source scipy-dev/bin/activate``, and ``deactivate`` to exit from the
virtual environment and back to your previous shell. With scipy-dev
activated, first install Scipy's dependencies::
$ pip install numpy pytest cython pybind11
After that, you can install a development version of Scipy, for example, via::
$ python setup.py install
The installation goes to the virtual environment.
*How do I set up an in-place build for development?*
For development, you can set up an in-place build so that changes made to
``.py`` files have effect without rebuild. First, run::
$ python setup.py build_ext -i
Then you need to point your PYTHONPATH environment variable to this directory.
Some IDEs (`Spyder`_, for example) have utilities to manage PYTHONPATH. On Linux
and OSX, you can run the command::
$ export PYTHONPATH=$PWD
and on Windows::
$ set PYTHONPATH=/path/to/scipy
Now, editing a Python source file in SciPy allows you to immediately
test and use your changes (in ``.py`` files), by simply restarting the
interpreter.
If you use the macOS, please find more information in the
:ref:`quickstart-mac`.
.. _virtualenv: https://virtualenv.pypa.io/
.. _virtualenvwrapper: https://bitbucket.org/dhellmann/virtualenvwrapper/
.. _Spyder: https://www.spyder-ide.org/
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