python - Django: "referenced before assignment" but only for some variables -

i'm writing small app in django , i'm keeping state saved in few variables declare out of methods in views.py. here important part of file:

from app.playerlist import fulllist auc_unsold = fulllist[:] auc_teams = [] auc_in_progress = [] auc_current_turn = -1 print(auc_in_progress)  def auc_action(request):     data = json.loads(request.get["data"])      # ...      elif data[0] == "start":         random.shuffle(auc_teams)         print(auc_unsold)         print(auc_in_progress)         auc_in_progress = [none, 0, none]         print(auc_in_progress) 

the auc_unsold , auc_teams variables work fine; auc_in_progress variable not seen method, though, giving error in title. if take out print statement , let code assign value it, exception thrown somewhere else in code use variable again.

i have tried making variable , new 1 seems suffer problem well.

what happening?

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edit: found solution: if write global auc_in_progress before print statements, works fine. if try writing declare variable above doesn't work, though, reason.

i unsatisfied this, because don't know why happens , because dislike using global that, eh. has explanation?

you should absolutely not doing this, either original code or proposed solution global.

anything @ module level shared across requests, not current user all users process. see same auction, etc.

the reason error because assign variable within function, automatically makes local variable: see this question more details. solution recommended there, same workaround - ie use global - not appropriate here; should store data somewhere associated user, eg session.