Cutlass requires the osdf-python project as a dependency to work properly. Verify that you already have osdf-python installed and in the PYTHONPATH. One way of doing this is by using the Python REPL:

  $ python
  > from osdf import OSDF
  > <CNTRL-D>
  

If there are no errors or exceptions, then you should be ready to proceed with the installation of Cutlass. Download or clone the cutlass source code from github.

  $ git clone https://github.com/ihmpdcc/cutlass
  

  $ cd cutlass
  

Then one can use easy_install to install . If you have root privileges:

  # easy_install .
  

or with sudo:

  $ sudo easy_install .
  

If you are performing a non-root installation, you can still use easy_install. First, pick an installation directory. In this example we'll use /tmp. Then add the installation directory to your PYTHONPATH environment variable if it isn't already there:

  $ export PYTHONPATH=$PYTHONPATH:/tmp
  

Then invoke easy_install with the --install-dir option. Note the final '.', which tells easy_install where to look for the setup.py script.

$ easy_install --install-dir /tmp .

Another tool that is commonly used to install Python modules is pip. To use pip to install Cutlass, download the source code as shown above, then invoke pip as root or using sudo:

  $ cd cutlass
  

  $ sudo pip install .
  

Verify installation using Python REPL again:

  $ python
  > from cutlass import *
  > <CNTRL-D>
  

An iHMP domain specific API using osdf-python

import sys
from cutlass import iHMPSession

# Need to provide credentials to do things with OSDF
session = iHMPSession(username, password)

sample = session.create_sample()

sample.body_site = “tongue dorsum”
sample.supersite = “oral”

# ...more data

# See if we are valid and, if so, save the data
if sample.is_valid():
    sample.save()
else
    validation_errors = sample.validate()
    sys.stderr.write(“\n”.join(validation_errors))

Cutlass comes with bundled tests to enable developers to make changes and check for regressions. Since cutlass is primarly written in Python, we use the unittest module. To invoke any of the tests, we recommend that you first change directories into the base of the cutlass code

  $ cd cutlass
  

Then, to invoke the a single test script (in this case test_project.py can be found in the tests/ directory):

  $ python -m unittest tests.test_project
  

To autodiscover all tests and run them all:

  $ python -m unittest discover