I'm doing a bunch of operations that are basically:
if ((x is not None) and (y is not None)) and x > y: do_something I'm doing this operation on every row of a data table where some of the values are null. Is there a more pythonic way of going about this, without have to check for None each time?
The parentheses are not needed, and None must be capitalized. Otherwise this is basically a good way to do it. Your data table might offer a way of filtering out all rows with None values at once, which would be an improvement.
Perhaps:
if not None in (x, y) and x > y: do_something() There is not a 'better' way to do it, however if you want to do it in one short line and make it more idiomatic, you could use:
do_something() if x is not None and y is not None and (x>y) else do_something_else() 
xandyare going to use large expression you could split this condition into different if-conditions firstly checking forNoneand then comparingxandyif not None in (x, y) and x > y:. This form can easily be extended to even more variables.