Resolving the AttributeError: 'str' object has no attribute 'draw_path' in Matplotlib

Discover how to fix the common `AttributeError` in Matplotlib when upgrading from Python 2.7 to Python 3 and learn about proper style sheet configurations.
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Fixing the AttributeError: 'str' object has no attribute 'draw_path' in Matplotlib

Upgrading from legacy versions of Python and libraries can often introduce unexpected challenges. One such issue many users face is the AttributeError: 'str' object has no attribute 'draw_path' while working with Matplotlib in Python 3. This guide aims to explain the cause of this error and provide a step-by-step guide to effectively resolve it.

The Problem

If you're attempting to save a plot using Matplotlib (say an area chart) and encounter the following error:

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

This typically occurs when there’s a discrepancy in how certain parameters are handled. In the case outlined, the error emerges during the call to savefig, indicating a likely issue with the arguments being passed into the function.

Understanding the Root Cause

The error can stem from a variety of reasons, but in this instance, it is related to the configuration of style sheets used in Matplotlib. Specifically, the issue revolves around how Matplotlib interprets lists within these style sheets:

Incorrect Formatting: If your Matplotlib configuration has an entry such as:

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

this is interpreted incorrectly as a string rather than an empty list.

Correct Formatting: Instead, it should simply be:

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

This format correctly indicates an empty list without the need for brackets.

Solution Steps

To resolve the AttributeError, follow these outlined steps:

Step 1: Locate Your Style Sheet

Identify the location of your Matplotlib style sheets. This might vary based on your installation but is typically found in a directory similar to:

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

Step 2: Edit the Style Sheet

Change from:

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

to:

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

Ensure any lists that require values are formatted correctly. For example, if defining a list with values, it should look like this:

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

Step 3: Save and Re-run

After making the changes, save the style sheet file. Then, re-run your script that attempts to produce and save the plot using savefig. The changes should rectify the AttributeError and allow for correct rendering of the plot.

Conclusion

Errors during upgrades from older Python versions to Python 3 can often stem from changes in how libraries, such as Matplotlib, handle configurations. Understanding how to format configuration styles correctly is key in preventing issues like the AttributeError: 'str' object has no attribute 'draw_path'. By following the steps outlined in this post, you should be able to resolve the issue and successfully export your plots.

If you continue to have trouble after following these steps, consider reaching out to community forums or reviewing the Matplotlib documentation for additional insights.