The io module

Files, directories, paths, and sockets, modeled on Rust’s std::fs, std::path and std::net.

Unlike the rest of the standard library, io is a module: bring it in with import io (and write io.File, io.Path) or import names directly with import [File, Path] from io. Every fallible operation returns an IoResult<T>, a Result whose error is an IoError.

• Path: building, splitting, and inspecting paths
• File: opening, reading, writing, and locking files, whole-file helpers, and FileTransfer
• Directory: listing, creating, and removing directories
• Network addresses: IpAddress, SocketAddress, and resolve
• Sockets: TcpListener, Incoming, SharedTcpListener, TcpStream, SocketTransfer, and UdpSocket
• Unix domain sockets: UnixListener, SharedUnixListener, UnixStream, and UnixDatagram
• Streams: the Reader and Writer traits, lines() and chunks()
• Streams in memory: ByteReader and ByteWriter
• Print: deprecated; use Writer
• Errors and platform types: IoError, ErrorKind, IoResult, and handle types

Example

import io;

main(): int {
    var path = io.Directory.temp().join("greeting.txt");
    assert(io.File.write_text(path, "hello").is_ok(), "write");
    assert(io.File.read_to_string(path).value() == "hello", "read back");
    io.File.remove(path);
    return 0;
}

Source: runtime/io/module.pep