#!/usr/bin/python3
"""
Simple cat emulation for a COMP2041/9044 lecture example
andrewt@unsw.edu.au
"""

import sys


def process_stream(stream):
    """
    copy bytes of f to stdout
    """
    for line in stream:
        print(line, end="")


def main():
    """
    process files given as arguments, if no arguments process stdin
    """
    if not sys.argv[1:]:
        process_stream(sys.stdin)
    else:
        for pathname in sys.argv[1:]:
            if pathname == "-":
                process_stream(sys.stdin)
            else:
                with open(pathname, "r") as f:
                    process_stream(f)


if __name__ == "__main__":
    main()