Rust's Cursor, Python's StringIO like object

cursortest.rs

use std::io;
use std::io::{ Write, Seek, BufRead };

fn main() {
    let mut buf = io::Cursor::new(Vec::<u8>::new());
    writeln!(buf, "{}", "abc").unwrap();
    writeln!(buf, "{}", "def").unwrap();

    buf.seek(io::SeekFrom::Start(0)).unwrap();

    let mut line = String::new();
    buf.read_line(&mut line).unwrap();
    println!("{}", line);
}