Long non-existing paths are reversed in python pl.read_csv()

[didriksg]

Polars version checks

• I have checked that this issue has not already been reported.

• I have confirmed this bug exists on the latest version of Polars.

Issue description

PR #6917 fixed #6853 by limiting the number of characters to 88 in the exception message. However, it also reverses the actual string itself.

It seems like the function:

polars/py-polars/src/file.rs

Lines 192 to 201 in 8364186

	fn no_such_file_err(file_path: &str) -> PyResult<()> {
	let msg = if file_path.len() > 88 {
	let file_path: String = file_path.chars().rev().take(88).collect();
	format!("No such file or directory: ...{file_path}",)
	} else {
	format!("No such file or directory: {file_path}",)
	};
	Err(PyErr::new::<PyFileNotFoundError, _>(msg))
	}

and specifically the line

polars/py-polars/src/file.rs

Line 194 in 8364186

let file_path: String = file_path.chars().rev().take(88).collect();

is responsible for the reversal.

The intended functionality is to use the 88 last characters directly.

Reproducible example

import polars as pl

pl.read_csv('TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTJJnon-existing-long-path')

>> FileNotFoundError: No such file or directory: ...htap-gnol-gnitsixe-nonJJTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT

Expected behavior

import polars as pl

pl.read_csv('TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTJJnon-existing-long-path')

>> FileNotFoundError: No such file or directory: ...TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTJJnon-existing-long-path

Installed versions

---Version info---
Polars: 0.16.14
Index type: UInt32
Platform: Linux-6.2.6-arch1-1-x86_64-with-glibc2.37
Python: 3.10.10 (main, Mar  5 2023, 22:26:53) [GCC 12.2.1 20230201]
---Optional dependencies---
numpy: 1.24.2
pandas: 1.5.3
pyarrow: <not installed>
connectorx: <not installed>
deltalake: <not installed>
fsspec: <not installed>
matplotlib: <not installed>
xlsx2csv: <not installed>
xlsxwriter: <not installed>