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sympy__sympy-20590

Based on the issue description and hints provided, I have enough information to generate the fix. The issue states that:

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  • AI research
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What it does and how to use it

A skill that teaches Claude Code to do ai research tasks well. It is packaged knowledge the model uses whenever it is relevant.

  1. Install the skill (command above).
  2. In Claude Code, describe what you need - the skill turns on by itself when the context fits.
  3. No commands to memorize: you talk in plain language and the skill does the rest.

Install (Claude Code)

mkdir -p .claude/skills/sympy-sympy-20590 && curl -fsSL https://doutorai.pt/data/lib/skills__sympy-sympy-20590.md -o .claude/skills/sympy-sympy-20590/SKILL.md

Paste this command into the terminal, in your project folder, and the component installs automatically.

Content

Based on the issue description and hints provided, I have enough information to generate the fix. The issue states that:

1. `DefaultPrinting` is in sympy's printing module
2. It needs `__slots__ = ()` added to it
3. This is similar to how `EvalfMixin` already has `__slots__ = ()`

The commit that introduced the bug was 5644df199fdac0b7a44e85c97faff58dfd462a5a from PR #19425, which made Basic inherit from DefaultPrinting.

The fix is straightforward - add `__slots__ = ()` to the `DefaultPrinting` class. Looking at sympy's code structure, `DefaultPrinting` is defined in `sympy/printing/defaults

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