@Marvin from prefect.variables import Variable qprod_env = Variable.get("qprod_env") print(qprod_env) Returns an error: $ w:/python.exe x:/NEW/IMQ-IPM/IPM-Prefect-Daily-Process/Testing/Deploy/sample.py W\lib\zoneinfo\ tzpath.py44: InvalidTZPathWarning: Invalid paths specified in PYTHONTZPATH environment variable. Paths should be absolute but found the following relativ e paths: W:share\zoneinfo warnings.warn( 100924.618 | DEBUG | prefect.profiles - Using profile 'research' id=UUID('91d18d16-4492-4b38-b6cd-be107eda4470') name='qprod_env' value='quatd' tags=['KDB', 'Model'] Exception ignored in: <function _ProactorBasePipeTransport.del at 0x0000028F075F0EE0> Traceback (most recent call last): File "W:\lib\asyncio\proactor_events.py", line 116, in del self.close() File "W:\lib\asyncio\proactor_events.py", line 108, in close self._loop.call_soon(self._call_connection_lost, None) File "W:\lib\asyncio\base_events.py", line 751, in call_soon self._check_closed() File "W:\lib\asyncio\base_events.py", line 515, in _check_closed raise RuntimeError('Event loop is closed') RuntimeError: Event loop is closed

It seems you're encountering a "RuntimeError: Event loop is closed" exception. This is often due to issues with the asynchronous event loop management in Python. Here's a breakdown of what might be happening and how you can address it: 1. Prefect Variable Retrieval: You are using

Variable.get

to retrieve a variable. This is correct for Prefect 3.x, and you can interact with variables using

get

,

set

, and

unset

methods in the Prefect Python SDK. More details can be found here. 2. Event Loop Error: The error message you're seeing is related to the closure of the event loop. This can happen if the event loop is closed prematurely or not managed correctly. Prefect tasks and flows often use asynchronous operations, which require a properly managed event loop. 3. Possible Solutions: - Ensure that you are running your script in an environment that supports asynchronous operations, like an

asyncio

event loop. - If you're running this in a script, ensure that the event loop is properly started and stopped. You might need to wrap your main logic in an

asyncio.run()

function or manage the event loop manually. 4. Common Gotchas: Prefect 3.x uses asynchronous operations heavily, and common issues include improper handling of futures and event loops. Ensure you are resolving futures correctly and managing the event loop if you are using async functions. For more detailed management of asynchronous code in Prefect, you might want to check the Prefect documentation or consider using an environment like Jupyter which handles these loops more gracefully. If you continue to have issues, consider providing more details about your environment setup or how the script is being executed.

@Marvin this is 2.18.3 not prefect 3

In Prefect 2.18.3, the

Variable.get()

method is used to retrieve variable values, and it seems you're using it correctly. However, the "RuntimeError: Event loop is closed" error is not directly related to the variable retrieval itself but rather to the asynchronous context management. Here's how you can address the issue: 1. Variable Usage: You can retrieve variables using

Variable.get()

in both synchronous and asynchronous contexts. Here's a simple example:

python
   from prefect.variables import Variable

   qprod_env = Variable.get("qprod_env")
   print(qprod_env.value)

2. Event Loop Management: The error typically arises from improper handling of the event loop in an asynchronous context. Here are a few steps to address it: - Ensure that your script or environment correctly initializes and manages the event loop. In a script, you might use

asyncio.run()

to manage the loop. - If you are using asynchronous functions, ensure they are awaited properly. 3. Troubleshooting: The Prefect 2.x documentation provides guidance on managing such issues. You can refer to the troubleshooting guide for more insights. 4. Variable Documentation: For more details on using variables in Prefect 2.x, you can check the variables guide. If you continue to experience issues, consider checking how the script is executed and whether any asynchronous operations are not being awaited correctly.

@Marvin Im not running anything Async though? why is it saying that the event loop is closed

The "RuntimeError: Event loop is closed" error can appear even in non-asynchronous code if there are underlying components or libraries that use asynchronous operations. Here are some potential reasons and solutions: 1. Prefect Internals: Prefect, even in its 2.x version, might internally use asynchronous operations for tasks such as scheduling or managing state transitions. This can lead to event loop issues if the environment isn't handling these correctly. 2. Environment Issue: If you're running this script in an environment that doesn't manage the event loop properly (e.g., certain IDEs or script runners), it might cause this error. Try running your script in a standard Python environment or terminal. 3. Library Interactions: Other libraries you might be using in your script could be interacting with asynchronous operations. Ensure that no other part of your code or libraries is closing the event loop prematurely. 4. Script Termination: If your script is terminating in a way that doesn't allow Prefect to clean up properly, it might result in this error. Ensure that the script exits gracefully. To troubleshoot: - Isolate the Prefect code in a minimal script to see if the error persists. - Run the script in a different environment or using a different Python interpreter to rule out environment-specific issues. - Check if any other part of your codebase is interacting with asynchronous operations or event loops. If none of these seem to apply, providing more details about your execution environment or any other libraries in use might help pinpoint the issue.