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.. _getting:
Installation
============
PyVISA is a wrapper around the `National Instruments's VISA` library, which you need to download and install in order to use PyVISA (:ref:`getting_nivisa`).
PyVISA has no additional dependencies except Python_ itself. In runs on Python 2.6+ and 3.2+.
.. warning:: PyVISA works with 32- and 64- bit Python and can deal with 32- and 64-bit VISA libraries without any extra configuration. What PyVISA cannot do is open a 32-bit VISA library while running in 64-bit Python (or the other way around).
**You need to make sure that the Python and VISA library have the same bitness**
You can install it using pip_::
$ pip install pyvisa
or using easy_install_::
$ easy_install pyvisa
That's all! You can check that PyVISA is correctly installed by starting up python, and importing PyVISA:
>>> import visa
>>> lib = visa.VisaLibrary()
If you encounter any problem, take a look at the :ref:`faq`.
Getting the code
----------------
You can also get the code from PyPI_ or GitHub_. You can either clone the public repository::
$ git clone git://github.com/hgrecco/pyvisa.git
Download the tarball::
$ curl -OL https://github.com/hgrecco/pyvisa/tarball/master
Or, download the zipball::
$ curl -OL https://github.com/hgrecco/pyvisa/zipball/master
Once you have a copy of the source, you can embed it in your Python package, or install it into your site-packages easily::
$ python setup.py install
.. note:: If you have an old system installation of Python and you don't want to
mess with it, you can try `Anaconda CE`_. It is a free Python distribution by
Continuum Analytics that includes many scientific packages.
.. _easy_install: http://pypi.python.org/pypi/setuptools
.. _Python: http://www.python.org/
.. _pip: http://www.pip-installer.org/
.. _`Anaconda CE`: https://store.continuum.io/cshop/anaconda
.. _PyPI: https://pypi.python.org/pypi/PyVISA
.. _GitHub: https://github.com/hgrecco/pyvisa
.. _`National Instruments's VISA`: http://ni.com/visa/
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