Fix: St.plotly_chart Width Parameter Deprecation

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Understanding the st.plotly_chart Deprecation Warning

Hey guys! Let's dive into a common hiccup when using st.plotly_chart in Streamlit. Specifically, we're looking at the kwargs deprecation warning that pops up when you're using the width parameter. It's like, you're just trying to make your charts look nice and fit the screen with width="content", and bam, a warning! This can be frustrating, but don't worry, we'll break it down and find a solution.

The Core Issue: Deprecation of kwargs

At the heart of the problem is the deprecation of kwargs (keyword arguments) within st.plotly_chart. Streamlit is moving away from allowing arbitrary keyword arguments and encouraging you to use specific, documented parameters instead. The warning is triggered even if you're only using the documented width and height parameters, which is the confusing part. This means even if you're not explicitly passing extra, undocumented arguments, the warning still appears.

This behavior is considered a regression, because in previous versions of Streamlit, using parameters like width="content" wouldn't trigger this warning. When you use width="content", you're telling the chart to adjust its width to fit the available content space, which is super useful for responsive design. The deprecation warning makes it seem like you're doing something wrong, even though you're using a perfectly valid parameter.

Reproducible Code Example and How to Trigger the Warning

Let's get practical with a simple example. Here's a snippet that demonstrates the issue:

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")

In this code:

  1. We import plotly.graph_objects and streamlit.
  2. Create a basic Plotly figure.
  3. Use st.plotly_chart to display the figure.
  4. The key part is width="content". This is where the deprecation warning is likely to appear. The warning message will tell you that the use of variable keyword arguments in st.plotly_chart is deprecated and will be removed in a future release. However, in this case, you are only using the documented width argument. This is the source of the frustration.

Why This Matters and the Impact

This might seem like a minor annoyance, but it can affect your Streamlit apps in several ways:

  • Cluttered Output: The warning message can clutter your app's output, making it harder to read and debug other issues.
  • False Alarms: The warning can make you think you're doing something wrong, even when your code is correct and using the intended parameters.
  • Future Compatibility: While the current code still works, the deprecation suggests that the behavior may change in future Streamlit versions, potentially breaking your app.

Troubleshooting and Potential Solutions

So, what can we do, guys? Let's explore some potential solutions and workarounds.

Verify Streamlit Version

First, make sure you are using the correct version of Streamlit. The described behavior is observed in Streamlit version 1.50.0. Ensure that you have upgraded to the latest version. Upgrade to the latest stable version of Streamlit. Sometimes, newer versions include bug fixes or improvements that address these types of issues.

Inspect the st.plotly_chart Call

Carefully review your code where you call st.plotly_chart. Double-check that you're only using the documented parameters (fig, use_container_width, width, height, config, theme). The warning can be triggered if there's even a slight typo or if you're unintentionally passing any extra arguments. Make sure you're not passing any extra, undocumented arguments to st.plotly_chart. If you are, remove them or find the correct way to specify those arguments using the supported parameters.

Check for Conflicts with Other Libraries

Sometimes, conflicts with other libraries can cause unexpected behavior. Ensure that there are no conflicting versions of libraries installed in your environment. If you suspect a conflict, try creating a new virtual environment and installing only the necessary libraries for your Streamlit app.

Consider Workarounds (If Necessary)

If the warning persists, you might consider the following workarounds:

  1. Ignore the Warning: If the chart displays correctly, and you're confident you're using the correct parameters, you can temporarily ignore the warning. However, keep an eye on future Streamlit updates, as the behavior might change.
  2. Explicitly Set Width in fig.update_layout: Instead of using width="content", you might be able to achieve the desired effect by calculating and setting the width and height in fig.update_layout. This might provide more control over the chart's size.

Debugging Tips

  • Print the kwargs: Add print(kwargs) before the st.plotly_chart call to see what arguments are actually being passed. This can help you identify any unexpected parameters. However, in this specific case, the kwargs should be empty, which is part of the problem.
  • Simplify the Code: Create a minimal, reproducible example (like the one above) to isolate the issue. This helps you determine if the problem is in your code or a Streamlit bug.
  • Check the Streamlit Issue Tracker: Search the Streamlit issue tracker (GitHub) for similar reports. Other users might have encountered the same problem and found a solution or workaround.

Submitting a Bug Report

If you've tried all the above steps and the warning persists, it might indicate a bug in Streamlit. If this is the case, consider submitting a bug report. Here's how:

  1. Check Existing Issues: Before submitting a new report, search the existing issues on the Streamlit GitHub repository to see if someone has already reported the same problem.
  2. Create a Clear Title: Give your issue a descriptive title that summarizes the problem (e.g., "st.plotly_chart width="content" triggers kwargs deprecation warning").
  3. Provide a Detailed Summary: Describe the issue in detail, including what you're trying to do, what you expect to happen, and what actually happens.
  4. Include a Reproducible Example: Provide a minimal, reproducible code example (like the one above) that demonstrates the issue. This makes it easier for the developers to understand and fix the problem.
  5. Specify Your Environment: Include information about your environment, such as your Streamlit version, Python version, operating system, and browser.
  6. Add Additional Information: Include any additional information that might be helpful, such as any workarounds you've tried or any error messages you've encountered.

By following these steps, you can help the Streamlit developers understand and resolve the issue quickly.

Conclusion

So there you have it, guys. The st.plotly_chart kwargs deprecation warning with the width parameter can be a bit of a headache, but with a bit of investigation and the right approach, it's manageable. Always keep an eye on your Streamlit version, check your code carefully, and don't hesitate to report any persistent issues. Keep on coding, and happy charting! "