Eva Python SDK

The Eva Python SDK provides convenient access to the Automata Eva API from applications written in Python 3. Documentation is available here.

* This SDK is currently in beta

• Eva Python SDK
  • Installation
    • Pip
    • Pipenv
    • Detail Instructions
  • Examples
    • Eva
    • evasdk.eva_http and evasdk.eva_ws
  • Versioning
  • Logging
  • Bugs and feature requests
  • Testing
  • Documentation
  • License

Installation

Requires Python 3, not compatible with Python 2

We support Python 3.6 and later.

Pip

Make sure you have Python3 and pip installed, then run the following command:

$ pip install evasdk

# Or for a specific version, i.e the lastest compatible version 2.x.x:
$ pip install evasdk~=2.0.0

Pipenv

Make sure you have Python3 and Pipenv installed, then run the following command:

$ pipenv install evasdk

# Or for a specific version, i.e the lastest compatible version 2.x.x:
$ pipenv install evasdk~=2.0.0

Detail Instructions

If your not familiar with Python or for more detailed instructions please refer to our wiki:

• Windows installation instructions
• Mac installation instructions

Examples

The following section provides some getting started example code, for more detailed examples please go to our eva_examples repository.

Eva

The Eva object allows you to directly control an Eva robot. It provides lots of useful helper function for interacting with the robot.

Connecting

host = '<your_eva_IP_here>'
token = '<your_token_here>'

eva = Eva(host, token)

GoTo movement

eva = Eva(host_ip, token)

with eva.lock():
    eva.control_wait_for_ready()
    eva.control_go_to([0, 0, 0, 0, 0, 0], mode='teach')

Toolpath create and run

toolpath = {
    "metadata": {
        "version": 2,
        "default_max_speed": 0.25,
        "payload": 0,
        "analog_modes": {
            "i0": "voltage",
            "i1": "voltage",
            "o0": "voltage",
            "o1": "voltage"
        },
        "next_label_id": 3
    },
    "waypoints": [{
        "label_id": 1,
        "joints": [0, 0.5235987755982988, -1.7453292519943295, 0, -1.9198621771937625, 0]
    }, {
        "label_id": 2,
        "joints": [0.18392622441053394, 0.8259819316864014, -2.050006151199341, 0.1785774528980255, -1.6037521743774412, -0.549331545829773]
    }],
    "timeline": [{
        "type": "home",
        "waypoint_id": 0
    }, {
        "type": "trajectory",
        "trajectory": "joint_space",
        "waypoint_id": 1
    }, {
        "type": "trajectory",
        "trajectory": "joint_space",
        "waypoint_id": 0
    }]
}

eva = Eva(host, token)

with eva.lock():
    eva.control_wait_for_ready()
    eva.toolpaths_use(toolpath)
    eva.control_home()
    eva.control_run(loop=1, mode='teach')

Please refer to the examples directory for more SDK usage examples.

evasdk.eva_http and evasdk.eva_ws

These can be used to interact directly with the HTTP and Websocket APIs. Useful when you don't want the managed websocket connection provided by the evasdk.Eva object.

Versioning

To determine which version of the SDK works with your Eva's software version number (found on the Choreograph config page), please reference the following table:

For more information on how to install a particular version of the SDK, please refer to the Installation section. We use the Semver version numbering stratergy.

Logging

The SDK uses Debug and Error level logging exclusively. Each Eva instance will log using the name evasdk.Eva:<host_name_here>. If you wish to enable the debug logging:

logging.basicConfig(level=logging.DEBUG)

Bugs and feature requests

Please raise any bugs or feature requests as a Github issues. We also gratefully accept pull requests for features and bug fixes.

Testing

# to run all test files in tests directory:
$ pipenv run test

# or to run a single test file:
$ pipenv shell
$ pipenv run testd tests/<test-name>_test.py

# some test require testing against a real robot. Therefore you will be required to supply a ip and token via the `--ip` and `--token` arguments as well as pass the --runrobot flag to notify pytest that you wish to run the robot tests:
$ pipenv run test --runrobot --ip 172.16.16.2 --token abc-123-def-456

# Tests requiring the robot or long amounts of time will not run by default,
# these require flags to be enabled, a full list of flags is available with the help flag:
$ pipenv run test -h

Documentation

Find the documentation here.

We are using Sphinx to generate documentation, and the documentation is deployed with Read The Docs.

We have added a few extensions to Sphinx

• sphinx.ext.autodoc to automatically generate package documentation based off of Python docstrings.
• m2r2 to convert rST to MD, this is so we can include README.md to the online docs.

We have a GitHub Action in the build.yaml workflow that will do this automatically update the documentation and commit the documentation changes on pushing a branch to GitHub. For this we are using EndBug/add-and-commit.

Read The Docs has automation rules. We have one set up that will automatically build documentation for any semver tagged version of the project.

We need to pass the force flag -f to overwrite modules.rst, as otherwise Sphinx will skip over searching the evasdk directory.

To generate a local version of the documentation:

cd docs
make html

Then open the file docs/_build/html/index.html in your browser.

License

This code is free to use under the terms of the Apache 2 license. Please refer to LICENSE for more information.