Well, the code checks two conditions, correct and not correct, and only one of
those is true on any given request. Yet you only set the value of one of your
session variables within each condition -- so of course the one you don't set
is None (it is actually undefined, but the session object is a Storage object,
which returns None for any requested attribute that doesn't exist). Outside of
the conditional logic, you could do something like:
session.counter = 0 if session.counter is None else session.counter
Alternatively, you could move that to the view:
{{=0 if session.counter is None else session.counter)}}
Anthony
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