docs: def ResolveHostnameToIP(host, port):
    """Resolves a hostname to an IP address."""
    ip_addrs = socket.getaddrinfo(host, port, socket.AF_UNSPEC, 0,
                                  socket.IPPROTO_TCP)
    # getaddrinfo returns tuples (family, socktype, proto, canonname, sockaddr).
    # We are interested in sockaddr which is in turn a tuple
    # (address, port) for IPv4 or (address, port, flow info, scope id)
    # for IPv6. In both cases, we want the first element, the address.
    result = ip_addrs[0][4][0]
    # TODO: In Python 2, this value is a byte string instead of UTF-8
    # string. To ensure type correctness until support for Python 2 is dropped,
    # we always decode this value.
    if compatibility.PY2:
      result = result.decode("ascii")
    return result