so good!!

owo recursive, nice

Good point

People commenting you should have stored strings over lists are dumb.
You should have put the same number in your adjacents dictionary though.

That way you can write: "adjacents[observed]" instead of "adjacents[observed] + [observed]"

Goddam that's nerdy

there used to be support for Python 2

What is that condition? You can check my code to see how I accomplished it. Not exactly genius work though.

Good catch! It certainly would make sense to make baryon_number a class variable, since it's a property of all quarks that is never expected to change.

Examining this kata's sample tests, I see that the baryon_number test is inside the test section labelled "Class attributes", so it would seem that you are correct in thinking that it should be a class variable.

But since the baryon_number is never supposed to change, it doesn't matter too much whether it's a class variable or an instance variable. The only time it makes a real difference is if you want to query the baryon_number, and there are no quarks that exist. Should we still be able to query the baryon_number? (Most people would say yes, but there are physicists who insist that measurements for particles that don't exist are non-sensical. For instance, every proton in the universe may have the exact same mass, but that measurement lacks meaning if there exist zero protons. But I digress...)

If you'll let me digress even more, what would be expected to happen if a quark suddenly happened to get its baryon number changed? Would that be an unusual quark, or would every quark in the universe also get its baryon number changed to the same value? (To be honest, I don't really know what a "baryon_number" is, but I'm sure if it changed for all quarks everywhere, life as we know it would be very different!)

Hopefully, we'll never have to worry about that scenario. But as for the purposes of the code here, it looks like that your hunch to make "baryon_number" a class variable is a correct one.

Shouldn't baryon_number be a class variable, since it's the same for every object?

excellent use of a dictionary

#11b3a/3qg:0z:vV

returning truthy or falsy value...

It is kind of to redundant to use a list of strings. A string is already an iterable, so you can just put

'1': '24',
'2': '153,
etc.

See my solution