Скачать или смотреть Accessing args in a Subprocess Bokeh Server

Learn how to effectively pass and access `args` when running a Bokeh server with subprocess in Python. This guide provides clear examples and explanations to tackle this common challenge.
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How to Access Arguments in a Bokeh Server Started by a Subprocess

Running a Bokeh server application often involves passing command-line arguments to customize its behavior. However, when invoking the Bokeh server from a Python script using the subprocess module, many users encounter an issue: they find that sys.argv does not include the intended arguments passed. This guide seeks to clarify how to effectively access these arguments.

The Challenge

You might find yourself in a situation where you have a Python file — let’s say script.py — that launches a Bokeh server and you want to pass arguments to be available in app.py (the Bokeh application). According to the documentation, sys.argv should provide access to those arguments. Yet, after launching the server via subprocess.Popen, you only see script.py in sys.argv.

This leads to the question: Is it possible to view the args of the subprocess Bokeh call inside the app?

The Solution

Yes, it is possible to access the provided args in your Bokeh application (app.py). Below, we will walk through how to do this step-by-step.

Step 1: Modify Your script.py

Here’s an example of how your script.py should be structured to pass the command-line arguments correctly to the Bokeh server:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Prepare Your app.py

In your app.py, you will need to import the sys module and print out the arguments:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Run Your Script

You can run your script from the command line and pass parameters like this:

[[See Video to Reveal this Text or Code Snippet]]

Expected Output

When you execute the command above, you should see output similar to this:

[[See Video to Reveal this Text or Code Snippet]]

This output confirms that you successfully passed the arguments t1, t2, and t3 to your Bokeh application, and they are accessible via sys.argv in app.py.

Conclusion

In this guide, we have addressed how to pass and access command-line arguments to a bokeh server that is launched via a subprocess in a Python script. By utilizing subprocess.Popen and capturing the sys.argv, you can effectively send and receive necessary input parameters. This adds a whole new layer of flexibility to your Bokeh applications!

With this knowledge, you can now customize your Bokeh apps and make them interactive based on the inputs provided at runtime.