Just for the record, I never called them bills just because they contain a dollar sign! I was thinking of a short word which describes an expression who's evaluation changes depending on the local circumstances. Like a legal bill, not a dollar bill.

The name macro doesn't really work, as it's only an expression, it's not a code block.

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The idea was never to start passing complex expressions around the place. It was just to allow a function to take an expression containing about one or two names, and evaluate the expression internally, so this...

func(lambda foo: foo > 0)

...can become...

func($foo > 0)

Other uses are there, and might be helpful from time to time, but it's mainly about cleaning up APIs. I personally work with user facing Python APIs all day, and users are generally programming interactively, so perhaps my take is atypical.

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What the hell is a thunk anyway? It's a horrible name.

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On the jQuery like syntax, $(foo), that might work and might do away with the issue of expressions containing bills always evaluating to bills. I took that too far. Good point.

Cheers