# scikit-learn__scikit-learn-13439

> Based on the GitHub issue description, I need to provide a patch for the scikit-learn Pipeline class to implement __len__. Let me create a patch based on t

- Source: https://doutorai.pt/en/components/skills__scikit-learn-scikit-learn-13439
- Type: Skills
- Category: AI research
- Downloads: 0
- Site: Doutor AI (https://doutorai.pt/en) - AI tools for small businesses

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/scikit-learn-scikit-learn-13439 && curl -fsSL https://doutorai.pt/data/lib/skills__scikit-learn-scikit-learn-13439.md -o .claude/skills/scikit-learn-scikit-learn-13439/SKILL.md
```

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

## Content

```
Based on the GitHub issue description, I need to provide a patch for the scikit-learn Pipeline class to implement `__len__`. Let me create a patch based on the standard scikit-learn codebase structure. The Pipeline class is in `sklearn/pipeline.py` and I need to add a `__len__` method that returns the number of steps in the pipeline.

Looking at the issue:
- Pipeline supports indexing with `pipe[:len(pipe)]`
- But `len(pipe)` raises an error because `__len__` is not implemented
- The fix is to add a `__len__` method that returns the number of steps

Based on the scikit-learn Pipeline implement

- 🔒 Full content on the Pro plan (€7.99/month) -
```

## Related components

- [PocketBase API Rules](https://doutorai.pt/en/components/skills__pocketbase-api-rules): API rules and filter expressions for PocketBase access control. Use when setting permissions, writing filter expressions, configuring who ca
- [PocketBase Collections](https://doutorai.pt/en/components/skills__pocketbase-collections): Collection and schema design for PocketBase. Use when creating collections, designing schemas, adding fields, setting up relations, or choos
- [PocketBase Deploy](https://doutorai.pt/en/components/skills__pocketbase-deploy): Production deployment for PocketBase. Use when deploying PocketBase to a server, setting up Docker, configuring systemd, reverse proxy (ngin
- [PocketBase Hooks](https://doutorai.pt/en/components/skills__pocketbase-hooks): Server-side JavaScript hooks for PocketBase (pb_hooks). Use when writing custom routes, event hooks, cron jobs, sending emails, making HTTP 
- [PocketBase Migrations](https://doutorai.pt/en/components/skills__pocketbase-migrations): Schema migrations and versioning for PocketBase. Use when creating migrations, managing schema versions, syncing collections between environ
- [PocketBase SDK](https://doutorai.pt/en/components/skills__pocketbase-sdk): JavaScript SDK usage for PocketBase client applications. Use when calling PocketBase from frontend or Node.js, authenticating users, subscri

## Save hours every week with AI, no hassle

**Doutor AI** gives you 1,859 ready-to-copy AI prompts, by industry and in plain English - plus a complete technical library for those who want to go further. [See plans →](https://doutorai.pt/en/pricing)

---
Content by Doutor AI (https://doutorai.pt/en). When quoting, please cite the source: https://doutorai.pt/en/components/skills__scikit-learn-scikit-learn-13439