io_guide

Comprehensive guide to reading and writing data in various formats with Polars.

Skills
Scientific
4

What it does and how to use it

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

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

Install (Claude Code)

mkdir -p .claude/skills/io-guide && curl -fsSL https://doutorai.pt/data/lib/skills__io-guide.md -o .claude/skills/io-guide/SKILL.md

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

Content

# Polars Data I/O Guide

Comprehensive guide to reading and writing data in various formats with Polars.

## CSV Files

### Reading CSV

**Eager mode (loads into memory):**
```python
import polars as pl

# Basic read
df = pl.read_csv("data.csv")

# With options
df = pl.read_csv(
    "data.csv",
    separator=",",
    has_header=True,
    columns=["col1", "col2"],  # Select specific columns
    n_rows=1000,  # Read only first 1000 rows
    skip_rows=10,  # Skip first 10 rows
    dtypes={"col1": pl.Int64, "col2": pl.Utf8},  # Specify types
    null_values=["NA", "null", ""],  # Define null value

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