Скачать или смотреть How to Fix the bt.plot() Error in Backtesting with Python

Discover how to resolve the `TypeError` when using `bt.plot()` from the backtesting library in Python, ensuring your trading strategies visualize effectively.
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This video is based on the question https://stackoverflow.com/q/77107085/ asked by the user 'Jorge Brehm' ( https://stackoverflow.com/u/22561885/ ) and on the answer https://stackoverflow.com/a/77109990/ provided by the user 'Alex' ( https://stackoverflow.com/u/22565380/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing the bt.plot() Error in Python's Backtesting Library

Creating a trading strategy using Python's backtesting libraries can be both exciting and challenging. However, one common issue that many users encounter is when they attempt to plot their strategies using the bt.plot() function and run into errors. This guide will delve into a specific error related to the bokeh library that may be causing your plotting problems, and provide a step-by-step solution to get you back on track.

Understanding the Problem

When using the bt.plot() function from the backtesting library, you might come across the following error:

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

This error indicates that there is a compatibility issue with the version of the bokeh library you have installed. Specifically, bokeh version 3.2.2 has introduced changes that break the plotting functionality in the backtesting library.

The Solution

To solve this problem, you will need to uninstall the problematic version of bokeh and install an earlier version that is compatible with your backtesting library. Here’s how to do it in a few simple steps:

Step 1: Uninstall bokeh

You need to remove the current version of the bokeh library to prevent any conflicts. Open your terminal or command prompt and run the following command:

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

Step 2: Install a Compatible Version

After you have uninstalled bokeh, the next step is to install version 3.2.1, which is known to work effectively with the backtesting library. Execute the following command in your terminal:

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

Step 3: Verify the Installation

Once you have installed the compatible version, it is a good idea to verify that everything has been set up correctly. You can do this by checking the version of bokeh installed:

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

Make sure it shows version 3.2.1 in the output.

Step 4: Run Your Code Again

Now that you have the correct version installed, you can try running your code again with the bt.plot() function. The error should be resolved, and you will be able to visualize your trading strategies without any hiccups.

Final Thoughts

Encountering errors while working with libraries can be frustrating, especially for those new to backtesting in Python. However, by addressing compatibility issues such as the one with bokeh, you can ensure that your trading strategies are visualized effectively. Remember to keep your libraries updated, but also be mindful of compatibility when major changes occur.

If you continue to encounter issues, consider checking the community forums or documentation for further assistance. Happy trading!