Streamlit `plotly_chart` Kwargs Warning: Easy Fix

Welcome, fellow data enthusiasts and Streamlit developers! If you’ve been building awesome interactive data applications with Streamlit and leveraging the power of Plotly for your visualizations, chances are you’ve encountered a peculiar message that can throw a wrench into your smooth development process: the plotly_chart kwargs deprecation warning. This particular warning often pops up even when you believe you're following all the rules, especially when trying to make your charts responsive using width="content". It's a head-scratcher because you're using a documented parameter, not seemingly passing arbitrary keyword arguments (kwargs). But don't worry, you're not alone, and we're here to unravel this mystery together! Streamlit, a fantastic open-source app framework for Machine Learning and Data Science, allows you to turn data scripts into shareable web apps in minutes. Its seamless integration with libraries like Plotly means you can create truly stunning and interactive charts that bring your data to life. Plotly, on the other hand, is a versatile charting library that supports over 40 unique chart types, from basic line plots to complex 3D visualizations, all rendered beautifully in web browsers. Combining these two tools empowers you to build rich, dynamic dashboards and data exploration tools. However, as with any evolving software, deprecation warnings are part of the journey, indicating changes in how functions are intended to be used. The plotly_chart kwargs deprecation warning is a prime example of such a change, signaling that certain ways of passing arguments to st.plotly_chart are being phased out. Specifically, the issue arises when developers use parameters like width="content" or height="content" to ensure their Plotly charts automatically adjust to the available space within the Streamlit container. While width and height are explicitly documented parameters for st.plotly_chart that replaced the older use_container_width (which was a boolean flag), the current implementation can incorrectly interpret these as variable keyword arguments (kwargs), triggering the deprecation notice. This can be frustrating because it suggests you're doing something wrong, even when you're following the latest best practices. Understanding the root cause of this warning is the first step towards resolving it and ensuring your Streamlit applications remain robust and future-proof. Our goal is to clarify why this plotly_chart kwargs deprecation warning appears, demonstrate how to reproduce it, and most importantly, provide you with practical, human-friendly solutions to make it disappear, allowing you to focus on delivering high-quality, valuable content to your readers and users without unnecessary distractions. Let's dive in and fix this pesky warning once and for all, making your Streamlit and Plotly experience as smooth as possible, enhancing the overall user experience and application reliability. Remember, a clear console means a happy developer!

Understanding the plotly_chart kwargs Deprecation Warning

Let's truly understand what the plotly_chart kwargs deprecation warning means and why it's showing up. In Python, kwargs (short for keyword arguments) is a common convention used to collect an arbitrary number of keyword arguments passed to a function. When you see **kwargs in a function definition, it means that the function can accept any number of additional keyword arguments that aren't explicitly named in its signature. For instance, def my_function(param1, **kwargs): allows you to call my_function(10, key='value', another_key=True). While this is a powerful feature for flexibility, it can also lead to ambiguity, especially when a library like Streamlit updates how it handles its own explicitly defined parameters. The st.plotly_chart function is Streamlit's primary way to display Plotly figures. Historically, Streamlit provided a use_container_width boolean parameter for st.plotly_chart to make the chart fill its parent column. This parameter has since been deprecated and replaced by explicit width and height parameters, which can accept values like `