Streamlit's Plotly Chart: Fix The Deprecation Warning

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Understanding the Streamlit Plotly Chart kwargs Deprecation Warning

Hey guys! Let's dive into this deprecation warning you might be seeing when using st.plotly_chart in Streamlit. It can be a bit confusing, especially when you're not explicitly passing any variable keyword arguments (kwargs) but still get the warning. This article breaks down the issue and shows you how to handle it, ensuring your Streamlit apps run smoothly.

What's the Issue?

The core of the problem lies in how Streamlit's st.plotly_chart function handles keyword arguments. Even if you're only using documented parameters like width="content" or height, the function might still trigger a deprecation warning related to kwargs. This happens because of internal checks within Streamlit that were introduced during updates related to handling deprecated features. Basically, Streamlit is telling you that the way you're passing configurations might change in the future, even if you're doing it "correctly" according to the current documentation. It's like getting a heads-up that road work is coming, even if you're currently driving on a perfectly good road!

Why is This Happening?

The deprecation warning arises from a specific code block implemented during kwargs handling changes. Here’s the snippet that causes the alert:

if kwargs:
    show_deprecation_warning(
        "Variable keyword arguments for st.plotly_chart have been "
        "deprecated and will be removed in a future release. Use the "
        "config argument instead to specify Plotly configuration "
        "options."
    )

This code checks if any kwargs are being passed to st.plotly_chart. If it detects any, it throws the deprecation warning, advising you to use the config argument instead for specifying Plotly configuration options. The catch is that even when you're only using well-documented parameters like width="content", this check still gets triggered, leading to the unnecessary warning. It’s a bit overzealous, like a security system that goes off even when you're just opening your own front door!

Reproducing the Warning

To see this in action, here’s a simple, reproducible code example using Streamlit and Plotly. This code will generate the deprecation warning when you run it:

import plotly.graph_objects as go
import streamlit as st

fig = go.Figure()
fig.add_trace(go.Barpolar(r=[1], theta=[0], width=[120]))
fig.update_layout(width=500, height=360)

st.plotly_chart(fig, width="content")

Steps to Reproduce

  1. Make sure you have Streamlit and Plotly installed (pip install streamlit plotly).
  2. Copy the code above into a Python file (e.g., app.py).
  3. Run the Streamlit app using the command streamlit run app.py.
  4. Observe the deprecation warning in your terminal or browser console.

Even though we are only using the width parameter, which is a documented and valid argument, the warning still pops up. It’s like following the recipe perfectly but still getting an unexpected result!

Expected vs. Current Behavior

Expected Behavior

Ideally, using documented parameters like width should not trigger a deprecation warning. The warning should only appear when using variable keyword arguments that are genuinely deprecated. When you switch from using use_container_width to width, as suggested in the documentation, you expect a smooth transition without any warnings. It's like upgrading to a new software version and expecting it to work without any glitches!

Current Behavior

Currently, the deprecation warning is displayed even when using the width parameter correctly. This can be confusing and misleading, as it suggests that you're doing something wrong when you're actually following the recommended practices. It’s like being told you parked illegally when you're clearly in a designated parking spot!

Debugging Information

Here's some debug information to help you understand the environment where this issue occurs:

  • Streamlit version: 1.50.0 (or later versions where this issue persists)
  • Python version: Python 3.7+ (the issue is not specific to a particular Python version)
  • Operating System: macOS, Windows, or Linux (the issue is OS-independent)
  • Browser: Chrome, Firefox, Safari, or Edge (the issue is browser-independent)

Knowing these details ensures that the problem isn't isolated to a specific setup. It’s like checking that everyone in the same study group is experiencing the same confusing concept!

Is This a Regression?

Yes, this can be considered a regression. In previous versions of Streamlit, using the width parameter in st.plotly_chart did not produce this deprecation warning. The warning was introduced with changes in how kwargs are handled, inadvertently affecting the use of standard parameters. It's like a software update that fixes one thing but breaks another!

Potential Solutions and Workarounds

While we wait for an official fix from the Streamlit team, here are a few potential solutions and workarounds to mitigate the impact of this deprecation warning.

1. Suppress the Warning (Not Recommended)

You can suppress the warning using Python's warning filters, but this is generally not recommended because it can hide other important warnings. However, if you absolutely need to get rid of the warning for aesthetic reasons, you can use the following code:

import warnings

warnings.filterwarnings("ignore", category=DeprecationWarning)

This code will ignore all deprecation warnings, which might not be ideal. It’s like turning off the smoke detector because it keeps going off when you're cooking – you might miss a real fire!

2. Use config Argument (If Applicable)

As the warning suggests, you can try using the config argument to specify Plotly configuration options. However, this might not be applicable for simple parameters like width. The config argument is more suited for advanced Plotly configurations. It's like using a Swiss Army knife to open a simple envelope – it works, but it's overkill!

3. Wait for an Official Fix

The best solution is to wait for an official fix from the Streamlit team. They are likely aware of this issue and will address it in a future release. Keep an eye on the Streamlit changelog and release notes for updates. It's like waiting for the mechanic to fix your car instead of trying to fix it yourself with no experience!

Conclusion

The deprecation warning in st.plotly_chart when using width="content" is a bit of a nuisance, but it doesn't break your code. By understanding the cause and potential workarounds, you can continue developing your Streamlit apps with confidence. Keep an eye on Streamlit updates, and hopefully, this issue will be resolved soon. Happy coding, and may your Streamlit apps always run smoothly!

Remember, always search for existing issues, provide descriptive titles, and include sufficient information to help reproduce any problems you encounter. This helps the Streamlit community and the developers to address issues more efficiently. It’s like being a good detective and providing all the clues to solve the mystery!