Had no idea you could create variable names like this for index's, or even accesing the pair with a ,
Nice!

Superb, clean solution! I didn't think to combine summing the digits into the key function directly.

Very easy to read too!

I like your solution... very clever

lovely :)

This solution might not be the shortest one, but it certainly is the most natural and simple. One can understand it from the first glance.

Quite a nice little solution, I like how it follows the progression of making the sequence of the drinks.

@dmc5809, you could google "python sort key" to get an explanation yourself, you know?

Great solution. I am confused as to how key=weight_key is working. I see you are using the function as a keyword arg, but the function is not being executed (). Can you explain more please?

Thanks

The sorted key parameter receives a tuple from weight_key which contains two values: First the weight-value, and second the string value itself.

In your example using "11" and "20000" the keys are thus (2, "11"), and (2, "20000"). Hence the weigh-values are equal, but the string values differ and are sorted accordingly.

I hope this clarifies it.

but how to resolve "11" and "20000"?

Tuple sorting seems best here.

@aliasfox,

Thanks for the comment!

I like the variable names, most straight forward I've seen on this challenge. That code needs absolutely no comments. Kudos.

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