Python Operations

The Python module allows you to execute Python code within the context of a deploy.

python.call

Stateless operation

This operation will always execute commands and is not idempotent.

Execute a Python function within a deploy.

python.call(function)

• function: the function to execute
• args: arguments to pass to the function
• kwargs: keyword arguments to pass to the function

Example:

def my_callback(hello=None):
    command = 'echo hello'
    if hello:
        command = command + ' ' + **hello**

    status, stdout, stderr = host.run_shell_command(command=command, sudo=SUDO)
    assert status is True  # ensure the command executed OK

    if 'hello ' not in '\n'.join(stdout):  # stdout/stderr is a *list* of lines
        raise Exception(
            f'`{command}` problem with callback stdout:{stdout} stderr:{stderr}',
        )

python.call(
    name="Run my_callback function",
    function=my_callback,
    hello="world",
)

python.raise_exception

Stateless operation

This operation will always execute commands and is not idempotent.

Raise a Python exception within a deploy.

python.raise_exception(exception)

• exception: the exception class to raise
• args: arguments passed to the exception creation
• kwargs: keyword arguments passed to the exception creation

Example:

python.raise_exception(
    name="Raise NotImplementedError exception",
    exception=NotImplementedError,
    message="This is not implemented",
)