Fix: Plotly Chart Deprecation Warning In Streamlit

Understanding the Streamlit Plotly Chart Deprecation Warning

Hey everyone! Have you encountered the st.plotly_chart kwargs deprecation warning when working with Streamlit and Plotly? It can be a bit of a headache, but don't worry, we're going to break it down. Basically, this warning pops up when you use st.plotly_chart with certain parameters, specifically when you're trying to control the width or height of your chart. Even if you're using the documented parameters like width="content", you might still see this warning, which is super annoying, but the core issue arises from how Streamlit handles keyword arguments (kwargs) in this specific function. This warning is a heads-up that some older ways of doing things are on their way out, and it's letting you know there's a better, more modern approach.

So, why is this happening, and what can you do about it? Let's dive in. The warning message itself is a clue. It's telling you that the way st.plotly_chart used to handle extra options (through kwargs) is being phased out. Instead, Streamlit wants you to use the config argument to specify Plotly configuration options. Think of config as the new, improved way to customize your charts. This change aims to make things cleaner, more consistent, and easier to understand in the long run. If you're seeing this warning, it means your code is likely using the older method, and it's time to make a small adjustment to keep things running smoothly. This is all about staying ahead of the curve and making sure your Streamlit apps are built to last.

This deprecation is not about an error, but rather a transition to a more sustainable way of using the st.plotly_chart function, and by updating your code to use the config argument for customization, you're helping your code adapt to future updates.

Reproducing the Issue: A Step-by-Step Guide

Let's get practical. If you want to see this warning in action, here’s a simple code example, and how you can reproduce it. The core of the problem lies in how you're setting the size of the chart. Specifically, if you use parameters like width="content", the warning might appear. Remember that the warning is not necessarily caused by passing kwargs directly, but rather by the function's internal handling of size-related arguments when certain parameters are used.

Here’s a basic code snippet to reproduce the warning:

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")

When you run this code, you'll likely see the deprecation warning. It’s important to understand that you're not explicitly passing any extra keyword arguments (kwargs) here. You're just using the documented width parameter. The warning still appears because of how st.plotly_chart processes these size-related parameters under the hood. The main thing to take away is that the warning is not a direct reflection of your code's usage of keyword arguments; instead, it indicates a change in how Streamlit handles these arguments internally. The deprecation warning is signaling an impending shift in how this function operates.

To really get a feel for this and perhaps prevent future occurrences, it's a good idea to experiment. Try changing the width and height parameters, and observe when the warning pops up. This kind of hands-on exploration will give you a better grasp of what's happening and how to adjust your code accordingly.

The Root Cause: Kwargs and Streamlit's Evolution

So, why is this deprecation happening in the first place? Well, it's all part of Streamlit's ongoing evolution and efforts to improve the developer experience. The use of keyword arguments (kwargs) in st.plotly_chart has been a source of potential confusion and maintenance challenges. By moving towards the config argument, Streamlit is aiming for a more streamlined and explicit way to customize charts. The config argument allows you to pass in Plotly configuration options in a more organized and predictable manner, making your code easier to read, understand, and maintain.

The deprecation warning is essentially a signal that Streamlit is moving away from the implicit handling of arguments through kwargs. This change helps make the code more robust and adaptable to future updates. The goal is to give developers more control and clarity over their chart configurations. As Streamlit evolves, the focus is increasingly on providing a more intuitive and developer-friendly experience. This includes standardizing how you pass arguments to functions and how you customize the behavior of your components.

The core of the issue is in how Streamlit handles the transition. It's not a bug but a planned change. The older method, while functional, was becoming less maintainable and less aligned with the direction of the library. Using config is the recommended way to move forward.

Practical Solutions: Addressing the Deprecation Warning

So, how do you actually fix the warning and keep your Streamlit apps running smoothly? The key is to start using the config argument more effectively. The config parameter in st.plotly_chart lets you pass in a dictionary of configuration options that Plotly understands. For basic size adjustments, you don’t necessarily need to use the config parameter directly. The width and height parameters are still available, so you can continue to use them.

However, to truly future-proof your code and fully embrace the intended changes, you can use the config argument to specify Plotly configuration options. For example, if you wanted to disable the modebar, you would use:

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", config={'displayModeBar': False})

In this example, the config argument is used to disable the modebar. The config dictionary is passed directly to st.plotly_chart. Now, if you are not using kwargs, but you are still seeing the warning, it is likely because the width parameter is being handled internally, triggering the warning. In most cases, you can simply ignore the warning if your charts are rendering correctly, but you should keep an eye on updates to Streamlit to stay informed of any changes.

Using the config argument gives you much greater control over your charts. You can customize many different aspects of the chart’s appearance and behavior, such as the display mode bar, zooming, and other interactive features. By making this small adjustment, you're aligning your code with the latest best practices, which is essential for long-term maintainability. This shift is about embracing a more explicit and controlled approach to configuring your plots. Remember, the goal is to enhance the clarity and robustness of your code.

Impact and Troubleshooting

The impact of this deprecation is relatively minor. Your existing code should continue to work. The main issue is the warning message, which can clutter your console and potentially make it harder to spot real errors. If you're seeing the warning, the best course of action is to update your code to align with the new recommended usage, but the functionality remains largely the same. If you decide to keep the existing code, just be aware that this is a transitional period, and future versions of Streamlit might change this behavior. So, keep an eye out for any updates.

Troubleshooting this issue is straightforward. First, make sure you're using the latest version of Streamlit. Then, examine your st.plotly_chart calls and look for any places where you're using width or height parameters. If the warning persists, try using the config argument to specify size-related parameters. This should resolve the warning. If you encounter any unexpected behavior, double-check your code for any potential conflicts or incorrect settings. Also, consider the documentation for st.plotly_chart to ensure you are using parameters correctly. Using the correct arguments is really important.

If you're still facing issues, look for support from the Streamlit community. The community is full of people who are using Streamlit. Other users might provide valuable insights and solutions. By being proactive and following these troubleshooting steps, you can resolve the warning and make your code more future-proof. Remember that the overall impact is minimal, and with a few adjustments, you can continue to create stunning interactive plots in your Streamlit apps.

Conclusion: Staying Up-to-Date with Streamlit

In conclusion, the st.plotly_chart kwargs deprecation warning is a signal of Streamlit's evolution towards a more robust and user-friendly development experience. By understanding the cause of this warning and adopting the recommended practices, you can ensure that your Streamlit apps remain functional and aligned with the latest best practices. Don't be afraid to experiment with the config argument and explore the full potential of Plotly charts within your apps. It's all about embracing change and staying up-to-date with the Streamlit ecosystem, which will help your coding skills and your projects to be a success.

As you continue to work with Streamlit, always keep an eye out for any updates or new features. Checking the official documentation is the best way to get accurate information. The Streamlit community is also a great place to stay informed and get support. With these resources, you’ll be well-equipped to handle any future changes and create amazing Streamlit apps. Keep coding, keep learning, and enjoy the journey!