1 Introduction

This is a book created from Markdown and executable code.

See Knuth (1984) for additional discussion of literate programming.

import polars as pl
from datetime import datetime

df = pl.DataFrame(
    {
        "integer": [1, 2, 3],
        "date": [
            datetime(2025, 1, 1),
            datetime(2025, 1, 2),
            datetime(2025, 1, 3),
        ],
        "float": [4.0, 5.0, 6.0],
        "string": ["a", "b", "c"],
    }
)

df

shape: (3, 4)

integer	date	float	string
i64	datetime[μs]	f64	str
1	2025-01-01 00:00:00	4.0	"a"
2	2025-01-02 00:00:00	5.0	"b"
3	2025-01-03 00:00:00	6.0	"c"