new_contents: """Constants governing operation of txrudp package."""
  
  # [bytes]
  UDP_SAFE_PACKET_SIZE = 1000
  
  # [length]
  WINDOW_SIZE = 65535 // UDP_SAFE_PACKET_SIZE
  
  # [seconds]
  TIMEOUT = 0.7
  
  # [seconds]
  _MAX_PACKET_DELAY = 20
  
  # If a packet is retransmitted more than that many times,
  # the connection should be considered broken.
  MAX_RETRANSMISSIONS = _MAX_PACKET_DELAY // TIMEOUT
  
subject: Install constants file.