The comma operator makes age,handicap a tuple to Python. The parenthesis make it a tuple to everyone else.

Close to mine but I totally forgot about tuple unpacking ...

because output is list

Just like msc3000 said. With more detail; kata itself asks for an array result containing class of each member (data), so in each iteration evaluated adds into the returning array 'Senior' or 'Open' depending on de result of that evaluation. Hope it helps despite my horrible english.

Is there a reason for writing it in square brackets ?

The highest rated and most clever really don't seem to be best practice. They are always harder to read.
Lines of code are cheap.

Very Pythonish I'd say!

Mine is the same, minus the much better named variables like here lol.

You don't have to consider all data types. But at the same time, it's important to take into account those scenarios that could be missed in the tech specification and which may appear as a result of the system operation (for example, if data in tuples is formed dynamically after they are entered through some interface). As a rule, such scenarios are checked by QA.

I think its probably clever, but definitely not the best practice as it is hard to track the code.

how the fuck you got the index from the list with the name lmaaaaaaaaaaaaaaaaaaooooooo

it is called unpacking.

You can try it, if the start number is greater than the end number, the result will be an empty set, and the sum will be 0.