loop.py

def get_rx_bytes(file: Path) -> Counter:
    rx = {}
    with open(file) as fp:
        for line in fp.readlines():
            if "Chassis/Slot/Port" in line:
                _, port, _ = line.split()
            elif "Bytes Received" in line:
                _, bytes_rx, *_ = line.split(":")
                bytes_rx = bytes_rx.replace(", Unicast Frames ", "").lstrip()
                rx[port] = int(bytes_rx)
    return Counter(rx)