You can use this for a fully working example with automated login (it uses secrets).

#49 (comment)

This is the code for adding a friend:

@client.friends.on("friend_invite")
def accept_invite(user):
    client.friends.add(user)
    if user.name == None:
        print("Added:", user.steam_id)
    else:
        print("Added:", user.name)
    gevent.sleep(2)
    user.send_message("Hi")

Closing this due to inactivity.