Google Wave机器人/ Python变量问题

Question

I'm experimenting/having a little fun with wave robot python apiv2.

I made a little 8ball app for the robot which works fine, and now I'm trying to make a trivia app.

I've never programmed in Python but I'm pretty sure my syntax is correct. Here is the relevant code:

elif (bliptxt == "\n!strivia"):
  reply = blip.reply()
  if (triviaStatus != "playing"):
   reply.append("Trivia Started!")
   triviaStatus = "playing"
  else:
   reply.append("Trivia is already running!")
elif (bliptxt == "\n!etrivia"):
  reply = blip.reply()
  if (triviaStatus == "playing"):
   reply.append("Trivia Ended!")
   triviaStatus = "stopped"
  else:
   reply.append("Trivia is not running! To start trivia, type !strivia")
else: (snipped out)

Okay so basically I want it to work so that when someone blips "strivia" the bot recognizes that someone wants to play so it first checks a variable called triviaStatus to see if we are already playing and goes from there. Pretty simple stuff.

In order for this to work (and, actually, this code is really meant to test this question out) the variables would need to effectively be like the php $_SESSION variables - that is, it remembers the value of the variable every time someone blips and does not reset each time.

Nevertheless, whether or not that is the case (if it isn't then I assume I can do the same thing by saving variable settings in a txt file or something) I am baffled because the code above does not work at all. That is to say, the robot is not replying on !strivia or on !etrivia. If the variables didn't save then if anything the robot should just reply with "Trivia Started" or with "Trivia is not running!" each time. But it just does not reply at all.

If I remove the check for triviaStatus, the robot DOES reply. But then there's no logic and I can't test my question out.

I also tried making a !trivstatus where it would reply back with

"Trivia status is " + triviaStatus

but that ALSO choked up. Why is it that every time I want to USE triviaStatus, the bot just dies? Note that I am able to SET triviaStatus fine (I just can't ever check what the output is by replying with it....)

So, to sum this up...how come the above code does not work but the following code DOES work:

elif (bliptxt == "\n!strivia"):
  reply = blip.reply()
  reply.append("Trivia Started!")
  trivia_status = "playing"
elif (bliptxt == "\n!etrivia"):
  reply = blip.reply()
  reply.append("Trivia Ended!")
  trivia_status = "stopped"

Thanks!

Answer 1

It seems that you should rename triviaStatus to trivia_status and make sure that trivia_status has some value eg, bind it to None before the first use. Otherwise your code might raise UnboundLocalError or NameError exceptions due to triviaStatus / trivia_status doesn't refer to any object.