Polars String or &str about polars HOT 5 CLOSED

Note that the DataFrame table repr doesn't show the underlying Rust types, it shows the short DataType names.

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Note that the DataFrame table repr doesn't show the underlying Rust types, it shows the short DataType names.

I am still confused. What is "short DataType names" ? And are they String or &str ?

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And, are the following two series different ?

let s1 = Series::new("a", ["abc", "abc", "abc"]);
let s1 = Series::new("a", ["abc".to_string(), "abc".to_string(), "abc".to_string()]);

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The type of string used to build the Series does not change the resulting Series dtype (DataType) as it is not a container of Rust primitive types; it has a String DataType of its own¹ (and there is no need to call to_string() on each element):

>>> s1.dtype()
DataType::String
>>> format!("{}", s1.dtype())
"str"

I'd suggest looking at the introductory Rust API documentation and the User Guide to get some insight into the key Polars data structures and types (including Series and DataType) 👍

Docs:

• API overview, data structures: https://docs.rs/polars/latest/polars/#data-structures
• User guide, data types: https://docs.pola.rs/user-guide/concepts/data-types/overview/

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The issue tracker is not meant for questions like this. Please ask on Discord or on Stack Overflow.

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