The installation and initialisation steps are slightly different if you want to work on Pytac. N.B. This guide uses pipenv but a virtualenv will also work.


This is only required on your first use.

  • Ensure you have the following requirements: Pip, Pipenv, and a local copy of Pytac.

  • Install dev-packages and Cothread for EPICS support:

    $ pipenv install --dev
    $ pip install cothread
    $ # Cothread is required for EPICS functionality, but Pytac can run without it.


This is required each time you want to start up Pytac.

  • Navigate to your pytac directory and activate a Pipenv shell, and start Python:

    $ cd <directory-path>
    $ pipenv shell
    $ python
    Python 2.7.3 (default, Nov  9 2013, 21:59:00)
    [GCC 4.4.7 20120313 (Red Hat 4.4.7-3)] on linux2
    Type "help", "copyright", "credits" or "license" for more information.
  • Import Pytac and initialise the lattice from the VMX directory:

    >>> import pytac.load_csv
    >>> lattice = pytac.load_csv.load('VMX')

The lattice object is used for interacting with elements of the accelerator.