# sympy__sympy-13471

> Based on the error message and the issue description, I can understand the problem. When Python 2 pickles a sympy Float expression, it saves the mantissa a

- Source: https://doutorai.pt/en/components/skills__sympy-sympy-13471
- Type: Skills
- Category: AI research
- Downloads: 0
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An open-source community component, curated and adapted by Doutor AI.

## 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)

```bash
mkdir -p .claude/skills/sympy-sympy-13471 && curl -fsSL https://doutorai.pt/data/lib/skills__sympy-sympy-13471.md -o .claude/skills/sympy-sympy-13471/SKILL.md
```

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

## Content

````
Based on the error message and the issue description, I can understand the problem. When Python 2 pickles a sympy Float expression, it saves the mantissa as a hex string that includes the `L` suffix for long integers (e.g., `'1L'`). When Python 3 tries to unpickle this, it fails because Python 3's `int()` function doesn't accept the `L` suffix.

The error occurs at line 1045 in `sympy/core/numbers.py`:
```python
num[1] = long(num[1], 16)
```

When `num[1]` is `'1L'` (a Python 2 long literal string), Python 3 can't parse it.

The fix needs to strip the trailing `L` from the hex string before co

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````

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Content by Doutor AI (https://doutorai.pt/en). When quoting, please cite the source: https://doutorai.pt/en/components/skills__sympy-sympy-13471