Algorithm for tallying values of variables?

[@berration]

I wasn't quite sure how to phrase the subject line, but I had another weird question.

I'm toying with the idea of having a “Percentage complete” report for the player. Thanks to a scene skip system I managed to cobble together, each scene has a variable at the end that keeps track of whether or not the user finished reading it. They're named like this:

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persistent.SCENENAME_view

I know how to do what I want manually, but since all of the variables end in “_view” I was hoping that maybe there was an smarter/easier way to gather up the information I need.

In short: is there a way to get the total number of True values in all persistent variables with names ending with “_view”?


(I assume there's no way of counting up the total number of these variables (i.e., the total number of scenes in the VN), since they don't actually exist until they've been set to True.)

[PyTom]

Here's some python magic for you. Basically, for a python object o, o.__dict__ is a dictionary that maps the field names to their values. The following code uses a generator expression to iterate over the dictionary to find interesting values, and then len to count how many of those values it finds.

Since names beginning with _ are reserved for Ren'Py, this code filters them out for future-proofing.

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$ total_true = len(k for k, v in persistent.__dict__.iteritems() if k.endswith("_view") and not k.startswith("_") and v) 

I didn't actually test this code - let me know if it works.

[@berration]

Ah, that looks like precisely the kind of thing I'm looking for. Certainly better than the embarrassing alternative I came up with due to my lack of Python knowledge.

I didn't actually test this code - let me know if it works.

Unfortunately, I received this error:

TypeError: object of type 'generator' has no len()

[PyTom]

Sorry, turns out you have to turn it into a list first:

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$ total_true = len(list(k for k, v in persistent.__dict__.iteritems() if k.endswith("_view") and not k.startswith("_") and v)) 

[@berration]

Sorry, turns out you have to turn it into a list first:

Ah, now that does work for me. Thanks!