czv

czv includes libraries for Rust, Python, and WebAssembly (JavaScript and TypeScript) providing CSV-related operations for data engineering and analysis tasks.

Links

• czv GitHub repository: https://github.com/rzmk/czv
• Rust: crates.io/crates/czv (source code) (docs)
• WebAssembly (JavaScript/TypeScript): npmjs.com/package/czv-wasm (source code)
• Python: pypi.org/project/czv (source code)

Installation and examples

In the following examples we'll get the total number of rows in the CSV data including the header row.

Rust

cargo install czv

use czv::{RowCount, Result};

fn main() -> Result<()> {
    let data: &str = "\
fruits,price
apple,2.50
banana,3.00
strawberry,1.50
";
    let output: usize = RowCount::new()
        .file_data(data)
        .include_header_row(true)
        .execute()?;
    println!("{output}"); // 4
    Ok(())
}

JavaScript/TypeScript (WebAssembly)

bun install czv-wasm

Or use npm, pnpm, or yarn instead of bun.

The following example is written in TypeScript:

import init, * as czv from "czv-wasm";
// Must run `await init()` or `initSync()` first for web use
await init();

const data = `fruits,price
apple,2.50
banana,3.00
strawberry,1.50`;

const output: number = czv.rowCount({
    file_data: data,
    include_header_row: true,
});

console.log(output);

You can view source code for an example website using czv-wasm at https://github.com/rzmk/czv/tree/main/czv-wasm/examples/web-demo.

Python

pip install czv

Or use uv pip instead of pip.

import czv

data: str = """fruits,price
apple,2.50
banana,3.00
strawberry,1.50"""

output: int = czv.row_count(file_data=data, include_header_row=True)

print(output) # 4

Available operations

czv (Rust)	czv-wasm (JS/TS)	czv-python	Summary
RowCount	rowCount	row_count	Get the number of rows
ColumnCount	columnCount	column_count	Get the number of columns

Development

Each package has its own README.md with more info for that particular package.

You may generate docs with:

cargo doc --no-deps --workspace --open

Notes

czv is inspired by the command-line tools xsv and qsv, but czv is not intended to cover all of their commands.

Not all provided libraries may be in sync at a given time. See the available operations table for a common operation list between libraries (not all implementations for a given operation may be in sync either, for example they may not have the same builder/function arguments).

Here are a few expected features for each provided operation:

• czv (Rust)
  • Provide both a builder (recommended and common for conditional parameters) and a function
  • Provide documentation (docstrings) in Markdown format
• czv-wasm (Web, JavaScript and TypeScript)
  • Use camelCase for exported functions
  • Include common browser support to run in-browser
  • Provide documentation (dosctrings) in TSDoc format
• czv-python
  • Provide documentation (docstrings) and type hints for IDEs when developers are using the Python library (sourced from czv-python/czv.pyi) in Markdown format